ꢀ
SocketModem
Embedded Modem
MT5600SMI Family
MT5600SMI-32
MT5600SMI-L32
MT5600SMI-P32
MT5600SMI-34
MT5600SMI-L34
MT5600SMI-XL34
MT5600SMI-P34
MT5600SMI-PL34
MT5600SMI-92
MT5600SMI-L92
MT5600SMI-XL92
MT5600SMI-P92
MT5600SMI-PL92
Developer’s Guide
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Table of Contents
Contents
Introduction................................................................................................................................................ 5
Technical Specifications............................................................................................................................ 7
Serial Pin Configurations........................................................................................................................... 9
Chapter 3 – Electrical Characteristics...................................................................................................... 13
3.3V Serial SocketModem ...................................................................................................................13
3.3V Parallel SocketModem.................................................................................................................13
5V Serial SocketModem ......................................................................................................................14
5V Parallel SocketModem....................................................................................................................14
Current and Power Requirements........................................................................................................... 15
Parallel Host Bus Timing Table ...........................................................................................................16
Parallel Host Bus - Read......................................................................................................................17
Parallel Host Bus - Write......................................................................................................................17
IER – Interrupt Enable Register (Addr = 1, DLAB = 0)........................................................................20
FCR – FIFO Control Register (Addr = 2, Write Only) ..........................................................................21
IIR – Interrupt Identifier Register (Addr = 2) ........................................................................................22
LCR – Line Control Register (Addr = 3)...............................................................................................23
MCR – Modem Control Register (Addr = 4) ........................................................................................24
LSR – Line Status Register (Addr = 5) ................................................................................................25
MSR – Modem Status Register (Addr = 6)..........................................................................................26
RBX – RX Buffer (Receiver Buffer Register) (Addr = 0, DLAB = 0) ....................................................26
THR – TX Buffer (Transmitter Holding Register) (Addr = 0, DLAB = 0)..............................................26
SCR – Scratch Register (Addr = 7)......................................................................................................27
Receiver FIFO Interrupt Operation.......................................................................................................... 28
Receiver Data Available Interrupt........................................................................................................28
Receiver Character Timeout Interrupts................................................................................................28
Transmitter FIFO Interrupt Operation...................................................................................................... 28
Transmitter Empty Interrupt .................................................................................................................28
Chapter 5 – AT Commands, S-Registers, and Result Codes................................................................. 29
Introduction.............................................................................................................................................. 29
Generic Modem Control Commands ...................................................................................................30
DTE-Modem Interface Commands......................................................................................................36
Call Control Commands.......................................................................................................................41
Modulation Control Commands ...........................................................................................................51
Error Control Commands.....................................................................................................................55
Data Compression Commands............................................................................................................60
V.8/V.8bis Commands .........................................................................................................................63
Diagnostic Commands.........................................................................................................................65
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Table of Contents
Compatibility Commands.....................................................................................................................70
FastConnect Commands.....................................................................................................................71
V.92 +P and –Q Commands................................................................................................................71
S-Registers.............................................................................................................................................. 75
Result Codes........................................................................................................................................... 83
Fax I/O Processing.................................................................................................................................. 86
DTE-to-Modem Transmit Data Stream................................................................................................86
Modem-to-DTE Receive Data Stream.................................................................................................86
Fax Mode Selection .............................................................................................................................87
Fax Origination.....................................................................................................................................87
Fax Answering .....................................................................................................................................87
Fax Control Transmission....................................................................................................................87
Fax Control Reception .........................................................................................................................88
Fax Data Transmission........................................................................................................................89
Fax Data Reception .............................................................................................................................89
Mode Entry Commands .......................................................................................................................90
Mode Commands.................................................................................................................................90
Service Class 1 Commands.................................................................................................................94
Examples................................................................................................................................................. 98
Chapter 7 – Voice Commands................................................................................................................. 100
<DLE> Shielded Event Codes Sent to the DTE ................................................................................101
<DLE> Shielded Codes Sent to the Modem (DCE)...........................................................................102
Chapter 8 – Setting Country Codes........................................................................................................ 114
Test/Demo Board Components............................................................................................................. 115
5V / 3.3V Jumper – JP6.....................................................................................................................116
Approvals – Product Safety and EMC................................................................................................... 118
Telecom Certifications .......................................................................................................................118
Regulatory Design Considerations........................................................................................................ 119
Hardware Considerations ..................................................................................................................119
EMC ...................................................................................................................................................120
PC Board Layout Guidelines..............................................................................................................121
Electromagnetic Interference (EMI) Considerations..........................................................................122
Safety.................................................................................................................................................122
5V Tolerant Inputs for 3.3V Modules .................................................................................................123
Regulatory Requirements for the United States................................................................................124
Regulatory Requirements for Canada ...............................................................................................127
New Zealand Telecom Warning Notice .............................................................................................129
South African Statement....................................................................................................................129
International Modem Restrictions ......................................................................................................130
EMC, Safety, and R&TTE Directive Compliance...............................................................................130
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Chapter 1 – Product Description and Specifications
Chapter 1 – Product Description and
Specifications
Introduction
The Multi-Tech SocketModem creates communication-ready devices by integrating data functionality into
a single product design. The SocketModem is a space-efficient (1" × 2.5"), embedded modem that
provides V.92 or V.34/33.6K data communication. The complete, ready-to-integrate modem dramatically
reduces development time and costs for system designers. The SocketModem complies with telecom
requirements, can be shipped worldwide, and is globally configurable.
This guide provides the hardware, software, and troubleshooting information needed to effectively
integrate the SocketModem into your equipment. This guide also provides:
S
S
commands that the developer can use to configure and control a data modem and
Result codes that the modem issues in response to the commands.
Product Description
The MT5600SMI SocketModem is a standard 64-pin modem used for integrating data communications.
S
It is a single-port 3.3V modem, which integrates the controller, DSP, and DAA in a 1" x 2.5" form
factor and communicates to a host controller via an asynchronous serial interface.
S
It is available with an 8-bit parallel interface.
This Developer's Guide covers all of the MT5600SMI products:
Product
MT5600SMI-32
MT5600SMI-L32
Description
V.32bis Serial Data/Fax 5V
V.32bis Serial Data/Fax 3.3V
Region
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
Global
MT5600SMI-P32 V.32bis Parallel Data/Fax 5V
MT5600SMI-34
MT5600SMI-L34
V.34 Serial Data/Fax 5V
V.34 Serial Data/Fax 3.3V
MT5600SMI-XL34 V.34 Serial Data/Fax 3.3V
MT5600SMI-P34 V.34 Parallel Data/Fax 5V
MT5600SMI-PL34 V.34 Parallel Data/Fax 3.3V
MT5600SMI-92
MT5600SMI-L92
V.92 Serial Data/Fax 5V
V.92 Serial Data/Fax 3.3V
MT5600SMI-XL92 V.92 Serial Data/Fax 3.3V
MT5600SMI-P92 V.92 Parallel Data/Fax 5V
MT5600SMI-PL92 V.92 Parallel Data/Fax 3.3V
How to Read the Product Codes in the Table Above:
32
34
92
L
P
X
V.32bis/14.4K data rate
V.34/33.6K data rate
V.92/56K data rate
3.3 volt power input (default is 5V)
Parallel interface (serial is default)
Exclude LED pinouts
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Chapter 1 – Product Description and Specifications
Developer's Kit
A Developer's Kit is available. The serial kit allows you to plug in the SocketModem and use it as a serial
modem for testing, programming, and evaluation. The parallel kit turns the parallel module into an ISA
modem. Each kit includes one SocketModem, one development board with an RS-232 DB-25 connector,
wall power adapter, RJ-11 jack, and RS-232 cable.
Features
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
Integrates the controller, data pump, and data access arrangement (DAA) in one module.
V.92/56K, V.34/33.6K, or V.32bis/14.4Kdata rates
Backward compatibility with lower speed data standards
3.3 Volt or 5 Volt power input options
Serial or parallel interface
V.17, V.21, V.27, V.29 Fax
Fax Class 1 and 1.0
V.22bis Fast Connect
FastPOS (V.29)
Voice send and receive functions
LED pin output option
Industry-standard error correction and data compression
DTMF detection and distinctive ring
Audio circuit outputs for audio call-progress monitoring
Three-number storage for automatic dialing capabilities and non-volatile memory (NoVRAM) to
store user profiles
S
S
S
S
S
S
S
S
S
S
S
S
S
S
S
Speaker interface for call progress monitoring
Full-duplex data transmission over dial-up lines
Line quality monitoring and retrain
Line protection circuitry included
Auto-dial, redial, and auto-answer
Pulse or tone dial
Call status display
Extension pickup detection
Caller ID detection
Remote hang-up detection
Digital PBX detection and protection
60-character command line buffering
AT command compatibility
Global approvals with a single module design
Intelligent DAA technology detects line status
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Chapter 1 – Product Description and Specifications
Technical Specifications
The SocketModem meets the following specifications:
Data Format
Data
Serial or parallel interface
V.92; V.90, V.34, V.32bis, V.32, V.22bis, V.22, V.23, V.21,Bell 212A & Bell 103
Error Correction
Data Compression
Fax
V.42 (LAP-M or MNP 2–4)
V.42bis, MNP 5
V.17, V.29, V.27ter, V.21 ch.2
Class 1 and 1.0 commands
Modes of Operation
Advanced
Full duplex over dial-up lines; data mode, command mode, online command mode
Extension pickup detection, remote hang-up detection, line-in-use detection,
digital PBX detection and protection
Flow Control
Command Buffer
Interface
XON/XOFF (software), RTS/CTS (hardware)
60 characters
Serial or 8-bit parallel interface
Telephony/TAM
V.253 commands: V.253
2-bit and 4-bit ADPCM, 8-bit linear PCM, and 4-bit IMA coding
8 kHz sample rate
Concurrent DTMF, ring, and Caller ID detection
Weight
0.6 oz. (0.017 kg.)
Dimensions
1.045" × 2.541" × 0.680" (2.65 x 6.45 x 1.7 cm)
Power Consumption
Typical: 115 mA (.38W @ 3.3 V DC); Maximum: 116 mA (.41 W @ 3.47 V DC)
Typical: 117 mA (.58 W @ 5 V DC); Maximum: 118 mA (.61 W @ 5.25 V DC)
Operational
0 to +70° C
Temperature
Humidity Range: 20 to 90% (non-condensing)
Storage Temperature -10 to +85° C
Sources of Additional Information
For information on Multi-Tech modem installation, AT commands, S-Registers, and testing refer to the
applicable user manual that came with your Multi-Tech modem. Multi-Tech manuals and other resources
For additional Multi-Tech information, contact:
http://www.multitech.com for News, Products, Solutions, Support, Manuals and more.
[email protected] for email technical support.
The Global Engineering Documents Web site manages a collection of more than one million documents
from over 460 organizations worldwide: http://global.ihs.com
Phone: 800-854-7179
Fax: 303-792-2192
ITU is the leading publisher of telecommunication technology, regulatory and standard information, with
over 4,000 titles in printed form, on CD-ROM and online at http://www.itu.int/publications/
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Chapter 2 – Mechanical Specifications
Serial Pin Configurations
The serial interface use an 16-pin interface to provide an on-board DAA with tip and ring connections,
audio circuit for call-progress monitoring and serial interface via logic level signals.
Figure 2–2. Serial SocketModems Pins
Available with or without LED Pins
Pin Descriptions for Serial SocketModem Devices
Pin
#
Signal
Name
I/O
Type
Description
1
Tip
I/O
I/O
I
Tip Signal from Telco. Tip connection to the phone line (RJ11 Pin 3).
SocketModem is Tip/Ring is polarity insensitive.
2
Ring
Ring Signal from Telco. Ring connection to the phone line (RJ11 Pin 4).
SocketModem is Tip/Ring is polarity insensitive.
24
–RESET
Modem Reset (with weak pull-up). The active low –RESET input resets the
SocketModem logic and returns the AT command set to the original factory
default values or to "stored values" in NVRAM. –RESET is tied to VCC
through a 400ms time constant circuit for "Power-on-Reset" functionality. The
modem is ready to accept commands within 6.5 seconds of power-on or reset.
Reset must be asserted for a minimum of 300 ns.
26
29
30
DGND
Ground
DCDIND
RXIND
DCD LED. Output from 74AC05 with 1500 Ohms pull-up.
RX LED. Output from 74AC05 with 1500 Ohms pull-up.
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Chapter 2 – Mechanical Specifications
Pin
#
Signal
Name
I/O
Type
Description
31
DTRIND
TXIND
–RTS
DTR LED. Output from 74AC05 with 1500 Ohms pull-up.
TX LED. Output from 74AC05 with 1500 Ohms pull-up.
Request to Send. RTS signal is used for hardware flow control.
32
33
34
I
–RXD
O
Received Data. Used to send data received from the telephone line and also
modem responses to the DTE. Modem response take priority over incoming
data. When no data is transmitted, the signal is held in mark condition.
35
36
37
–TXD
–RI
I
Transmit Data. The DTE uses this line to send data to the modem for
transmission over the telephone line or to transmit commands to the modem.
The DTE should hold this circuit in the mark state when no data is being
transmitted or during intervals between characters.
O
O
Ring Indicate. –RI output ON (low) indicates the presence of an ON segment
of a ring signal on the telephone line.
The modem will not go off-hook when –RI is active; the modem waits for –RI
to go inactive before going off-hook.
–DSR
Data Set Ready. –DSR indicates modem status to the DTE. –DSR OFF
(high) indicates that the DTE is to disregard all signals appearing on the
interchange circuits except Ring Indicator (–RI). It reflects the status of the
local data set, and does not indicate an actual link with any remote data
equipment.
38
–CTS
O
Clear To Send. –CTS is controlled by the modem to indicate whether or not
the modem is ready to transmit data. –CTS ON, indicates to the DTE that
signals presented on TXD will be transmitted to the telephone line. –CTS OFF
indicates to the DTE that it should not transfer data across the interface on
TXD.
39
40
–DCD
–DTR
O
I
Data Carrier Detect. –DCD output is ON (low) when a carrier is detected on
the telephone line or OFF (high) when carrier is not detected.
Data Terminal Ready (Active Low). The –DTR input is turned ON (low) by
the DTE when the DTE is ready to transmit or receive data. –DTR ON
prepares the modem to be connected to the telephone line, and, once
connected, maintains the connection. –DTR OFF places the modem in the
disconnect state.
41
61
63
DGND
VCC
Ground.
3.3V DC Power.
AGND
Analog Ground. Analog ground is tied common with DGND on the
SocketModem. To minimize potential ground noise issues, connect audio
circuit return to AGND.
64
SPKR
Speaker Output. SPKR is a single ended-output. SPKR is tied directly to the
CODEC. One side of a differential AC output coupled through a 6.8K ohm
resistor and capacitor.
The call progress speaker interface signal is:
S Digital speaker output (DSPKOUT); output
DSPKOUT is a square wave output in data mode used for call progress or
carrier monitoring. This output can be optionally connected to a low-cost on-
board speaker, e.g., a sounducer, or to an analog speaker circuit.
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Chapter 2 – Mechanical Specifications
Parallel Pin Configurations
The parallel interface SocketModem uses a 22-pin interface to provide an on-board DAA with tip and ring
connections, audio circuit for call-progress monitoring, and parallel interface.
Figure 2–3. Parallel SocketModem Pins
Pin Descriptions for a Parallel SocketModem Device
Pin # Signal Name I/O
Description
1
Tip
I/O
I/O
I
Telephone Line Interface – TIP
Telephone Line Interface – RING
2
Ring
24
–RESET
Modem Reset (CMOS input with weak pull-up). The active low –RESET input
resets the SocketModem logic and returns the AT command set to the original
factory default values or to "stored values" in NVRAM.
The modem is ready to accept commands within 6.5 seconds of power-on or
reset. Reset must be asserted for a minimum of 300 ns.
25
26
27
A1
Host Bus Address Line 1
DGND
D7
GND Digital Ground
O
O
O
I
Host Bus Data Line 7
29
30
31
D2
INT
A0
Host Bus Data Line 2
Host Bus Interrupt Line, Active High, Resets on Low
Host Bus Address Line 0
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Chapter 2 – Mechanical Specifications
Pin # Signal Name I/O
Description
32
33
34
35
36
37
38
39
40
41
61
63
–WT
–RD
A2
I
Host Bus Write. When low, allows host to write to SocketModem.
Host Bus Read. When low, allows host to read from SocketModem.
Host Bus Address Line 2
I
I
D4
O
O
Host Bus Data Line 4
D5
Host Bus Data Line 5
D0
O
Host Bus Data Line 0
D1
O
Host Bus Data Line 1
D3
O
Host Bus Data Line 3
–CS
D6
I
Host Bus Chip Select; active low
Host Bus Data Line 6
O
VCC
AGND
PWR
GND
3.3V or 5V Supply (depends upon model).
Analog Ground. This is tied common with DGND on the SocketModem. To
minimize potential ground noise issues, connect audio circuit return to AGND.
64
SPKR
O
Speaker, Call Monitor
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Chapter 3 – Electrical Characteristics
Chapter 3 – Electrical Characteristics
Handling Precautions
All electronic devices should be handled with certain precautions to avoid damage due to the
accumulation of static charge. Although input protection circuitry has been incorporated into the devices
to minimize the effect of this static buildup, proper precautions should be taken to avoid exposure to
electrostatic discharge during handling and mounting.
I/O Electrical Characteristics
3.3V Serial SocketModem
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V 0.3 V) VDDMAX = 3.6 V
Inputs
Input High
Min 2.0 V
Input Low
Max 0.8 V
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Inputs
Output High
Output Low
Max 0.5 V
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34) Min 2.4 V
2mA, Z INT = 120 ꢀ
Digital Input Capacitance
50pF
3.3V Parallel SocketModem
Electrical characteristics for Parallel SocketModem devices are presented below.
3.3V DC Characteristics (TA = 0°C to 70°C; VDD = 3.3 V 0.3 V) VDDMAX = 3.6 V
Digital Inputs
Input High
Input Low
–DS (40)
Min 2.0 V
Max 0.8 V
Digital Inputs (hysteresis input buffer)
Input High
Input Low
A0 (31), A1 (25), A2 (34),
–WR (32), –RD (33) Min 2.0 V
Max 0.8 V
8mA Z INT = 50ꢀ
2mA ZINT = 120 ꢀ
Digital Input/Output
Input High
Input Low
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5
(36), D6 (41), D7 (27)
Min 2.0 V
Max 0.8 V
Output High Output Low
Min 2.4 V Max 0.5 V
2mA, Z INT = 120 ꢀ
Digital Output
INT (30)
Output High Output Low
Min 2.4 V Max 0.5 V
2mA, Z INT = 120 ꢀ
Digital Input Capacitance
50pF
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Chapter 3 – Electrical Characteristics
5V Serial SocketModem
5 Vdc Characteristics (TA = 0 °C to 50 °C; VDD = 5 V 0.25 V)
VDDMAX = 5.25 V
Digital Inputs
Input High Input Low
Min 3.5 V Max .8 V
–DTR (40), –TXD (35), –RTS (33), –RESET (24)
Digital Outputs
Output High Output Low Current Drive
–DCD (39), –CTS (38), –DSR (37), –RI (36), –RXD (34)
Min 4 V
Max 0.5 V
15 ma
Digital Input Capacitance
5 PF
5V Parallel SocketModem
5 Vdc Characteristics (TA = 0 °C to 50 °C; VDD = 5 V 0.25 V) VDDMAX = 5.25 V
Digital Inputs
–DS (40)
Input High Input Low
Min 2 V Max .8 V
Digital Inputs (hysteresis input buffer)
A0 (31), A1 (25), –WR (32), –RD (33)
Input High Input Low
Min 2 V Max .8 V
Digital Input / Output
DO (37), D1 (38), D2 (29), D3 (39), D4 (35), D5 (36),
D6 (41), D7 (27)
Input High Input Low
Min 2 V Max .8 V
Current Drive
8 ma
Digital Output
INT (30)
Output High Output Low Current Drive
Min 2.4 V
Max 0.5 V 8 ma
Digital Input Capacitance
5 PF
Operating Conditions
Parameter
Symbol
Limits
Units
+3.3 V Configuration
Supply voltage (Pin 61 = +3.3 V)
Operating ambient temperature
VDD
+3.13 to +3.47
0 to +70
VDC
°C
T
A
+5 V Configuration
Supply voltage (Pin 61 = +5 V)
Operating ambient temperature
VDD
+4.75 to +5.25
0 to +70
VDC
°C
T
A
Absolute Maximum Ratings
Parameter
Symbol
Limits
Units
Supply voltage (Pin 61 = +3.3 V)
VDD
-0.5 to +4.0
VDC
VDC
VDC
VDC
°C
Supply voltage (Pin 61 = +5 V)
Input voltage
VDD
-0.5 to +7.0
V
-0.5 to (VDD +0.5)
+3.13 to +3.47
-40 to +80
IN
Voltage applied to outputs in high impedance (Off) state
Storage temperature
V
OUT
T
STG
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Chapter 3 – Electrical Characteristics
Current and Power Requirements
Typ.
Max.
Typ.
Max.
Mode
Current (mA)
Current (mA)
Power (mW)
Power (mW)
+3.3 V Configuration (VDD = +3.3 V)
115 116
+5 V Configuration (VDD = +5 V)
Normal Mode (Serial interface)
0.38
0.41
Normal Mode (Serial interface)
Normal Mode (Parallel interface)
Test conditions:
117
117
118
118
0.58
0.58
0.61
0.61
For Pin 61 = +5 V, VDD = +5 V for typical values; VDD = +5.25 V for maximum values.
For Pin 61 = +3.3 V, VDD = +3.3 V for typical values; VDD = +3.47 V for maximum values.
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Chapter 3 – Electrical Characteristics
Parallel Host Bus Timing
Parallel Host Bus Timing Table
Symbol
Parameter
Min
Max
Units
READ (See Notes)
tAS
Address Setup
Address Hold
5
10
0
10
45
-
-
-
-
-
25
-
ns
ns
ns
ns
ns
ns
ns
tAH
tCS
tCH
tRD
tDD
tDRH
Chip Select Setup
Chip Select Hold
RD Strobe Width
Read Data Delay
Read Data Hold
-
5
WRITE (See Notes)
tAS
Address Setup
Address Hold
Chip Select Setup
Chip Select Hold
WT Strobe Width
5
15
0
10
75
-
-
-
-
-
20
-
ns
ns
ns
ns
ns
ns
ns
tAH
tCS
tCH
tWT
tDS
Write Data Setup (see Note 4)
Write Data Hold (see Note 5)
-
5
tDWH
Notes:
1. When the host executes consecutive Rx FIFO reads, a minimum delay of 2 times the internal CPU
clock cycle plus 15 ns (85.86 ns at 28.224 MHz) is required from the falling edge of RD to the falling
edge of the next Host Rx FIFO RD clock.
2. When the host executes consecutive Tx FIFO writes, a minimum delay of 2 times the internal CPU
clock cycle plus 15 ns (85.86 ns at 28.224 MHz) is required from the falling edge of WT to the
falling edge of the next Host Tx FIFO WT clock.
t
t
3. RD' tWT = CYC + 15 ns.
4. tDS is measured from the point at which both CS and WT are active.
5. tDWH is measured from the point at which either CS and WT become active.
6. Clock Frequency = 28.224 MHz clock.
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
Chapter 4 – SocketModem Parallel
Interface – A Programmer’s
Description
SocketModem Parallel Interface
The modem supports a 16550A interface in parallel interface versions. The 16550A interface can operate
in FIFO mode or non-FIFO mode. Non-FIFO mode is the same as the 16450 interface operation. FIFO
mode’s unique operations are described in this chapter.
Overview
The modem emulates the 16450/16550A interface and includes both a 16-byte receiver data first-in first-
out buffer (RX FIFO) and a 16-byte transmit data first-in first-out buffer (TX FIFO).
FIFO Mode Selected
When FIFO mode is selected in the FIFO Control Register (FCR0 = 1), both FIFOs are operative.
Furthermore, when FIFO mode is selected, DMA operation of the FIFO can also be selected (FCR3 = 1).
FIFO Mode Not Selected
When FIFO mode is not selected, operation is restricted to a 16450 interface operation.
Receive Data
Received Data is read by the host from the Receiver Buffer (RX Buffer). The RX Buffer corresponds to
the Receiver Buffer Register in a 16550A device. In FIFO mode, the RX FIFO operates transparently
behind the RX Buffer. Interface operation is described with reference to the RX Buffer in FIFO and non-
FIFO modes.
Transmit Data
Transmit Data is loaded by the host into the Transmit Buffer (TX Buffer). The TX Buffer corresponds to
the Transmit Holding Register in a 16550A device. In FIFO mode, the TX FIFO operates transparently
behind the TX Buffer. Interface operation is described with reference to the TX Buffer in both FIFO and
non-FIFO modes.
Note
The parallel interface registers and the corresponding bit assignments are shown in Table 4–1.
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
Table 4–1. Parallel Interface Registers
BIT No.
Register
Register
Name
No.
7
6
5
4
3
2
1
0
7
6
Scratch Register (SCR)
Modem Status Register
(MSR)
Scratch Register
Clear to Delta Data
Ready Send CTS) Carrier Edge of Ring Set Ready
Data
Carrier
Detect
(DCD)
RX
Ring
Indicator
(RI)
Data Set
Trailing
Delta Data Delta Clear
to Send
(DCTS)
(DSR)
Detect
(DDCD)
Framing
Error
Indicator
(TERI)
Parity
Error
(DDSR)
5
Line Status Register
(LSR)
Transmitter Transmitter Break
Overrun
Error
Receiver
Data
FIFO
Error
Empty
(TEMT)
Buffer
Register
Empty
(THRE)
0
Interrupt
(BI)
(FE)
(PE)
(OE)
Ready
(DR)
4
3
Modem Control
Register (MCR)
0
0
Local
Out 2
Out 1
Request
to Send
(RTS)
Data
Terminal
Ready
Loopback
(DTR)
Line Control Register
(LCR)
Divisor
Latch
Access Bit
(DLAB)
Set
Break
Stick
Parity
Even
Parity
Select
(EPS)
Parity
Enable
(PEN)
Number
of Stop
Bits
Word
Length
Select
Bit 1
Word Length
Select
Bit 0
(WLSO)
(STB)
(WLS1)
2
2
1
Interrupt Identify
Register (IIR)
(Read Only)
FIFO Control Register Receiver Receiver
(FCR)
(Write Only)
Interrupt Enable
FIFOs
Enabled
FIFOs
Enabled
0
0
Pending
Pending
Pending
“0” if
Interrupt
Pending
FIFO
Interrupt ID Interrupt ID Interrupt ID
Bit 2
DMA
Mode
Select
Enable
Modem
Status
Interrupt
(EDSSI)
Bit 1
TX FIFO
Reset
Bit 0
RX FIFO
Reset
Reserved Reserved
Trigger
MSB
0
Trigger
LSB
0
Enable
0
0
Enable
Enable
Enable
(DLAB = 0) Register (ER)
Receiver Transmitter Received
Line Status Holding
Interrupt
(ELSI)
Data
Register
Empty
Interrupt
(ETBEI)
Available
Interrupt
(ERBFI)
0
Transmitter Buffer
Transmitter FIFO Buffer Register (Write Only)
(DLAB = 0) Register
(THR)
0
Receiver Buffer
Receiver FIFO Buffer Register (Read Only)
Divisor Latch MSB
(DLAB = 0) Register (RBR)
1
Divisor Latch MSB
(DLAB = 1) Register (DLM)
Divisor Latch LSB
(DLAB = 1) Register (DLL)
0
Divisor Latch LSB
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
Register Signal Definitions
IER – Interrupt Enable Register (Addr = 1, DLAB = 0)
The IER enables five types of interrupts that can separately assert the HINT output signal (Table 4–
2.). A selected interrupt can be enabled by setting the corresponding enable bit to a 1, or disabled by
setting the corresponding enable bit to a 0. Disabling an interrupt in the IER prohibits setting the
corresponding indication in the IIR and assertion of HINT. Disabling all interrupts (resetting IER0 –
IER3 to a 0) inhibits setting of any Interrupt Identifier Register (IIR) bits and inhibits assertion of the
HINT output. All other system functions operate normally, including the setting of the Line Status
Register (LSR) and the Modem Status Register (MSR).
The IER enables five types of interrupts that can separately assert the HINT output signal. A selected
interrupt can be enabled by setting the corresponding enable bit to a 1, or disabled by setting the
corresponding enable bit to a 0. Disabling an interrupt in the IER prohibits setting the corresponding
indication in the IIR and assertion of HINT. Disabling all interrupts (resetting IER0 - IER3 to a 0)
inhibits setting of any Interrupt Identifier Register (IIR) bits and inhibits assertion of the HINT output.
All other system functions operate normally, including the setting of the Line Status Register (LSR)
and the Modem Status Register (MSR).
Bits 7-4
Not used.
Always 0.
Bit 3
Enable Modem Status Interrupt (EDSSI).
This bit, when a 1, enables assertion of the HINT output whenever the Delta CTS
(MSR0), Delta DSR (MSR1), Delta TER (MSR2), or Delta DCD (MSR3) bit in the
Modem Status Register (MSR) is a 1. This bit, when a 0, disables assertion of
HINT due to setting of any of these four MSR bits.
Bit 2
Enable Receiver Line Status Interrupt (ELSI).
This bit, when a 1, enables assertion of the HINT output whenever the Overrun
Error (LSR1), Parity Error (LSR2), Framing Error (LSR3), or Break Interrupt
(LSR4) receiver status bit in the Line Status Register (LSR) changes state. This
bit, when a 0, disables assertion of HINT due to change of the receiver LSR bits
1-4.
Bit 1
Bit 0
Enable Transmitter Holding Register Empty Interrupt (ETBEI).
This bit, when a 1, enables assertion of the HINT output when the Transmitter
Empty bit in the Line Status Register (LSR5) is a 1. This bit, when a 0, disables
assertion of HINT due to LSR5.
Enable Receiver Data Available Interrupt (ERBFI) and Character Timeout in
FIFO Mode.
This bit, when a 1, enables assertion of the HINT output when the Receiver Data
Ready bit in the Line Status Register (LSR0) is a1 or character timeout occurs in
the FIFO mode. This bit, when a 0, disables assertion of HINT due to the LSR0
or character timeout.
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FCR – FIFO Control Register (Addr = 2, Write Only)
The FCR is a write-only register used to enable FIFO mode, clear the RX FIFO and TX FIFO, enable
DMA mode, and set the RX FIFO trigger level.
Bits 7-6 RX FIFO Trigger Level
FCR7 and FCR6 set the trigger level for the RX FIFO (Receiver Data Available) interrupt.
FCR7
FCR6
RX FIFO Trigger Level (Bytes)
0
0
1
1
0
1
0
1
01
04
08
14
Not used
Bits 5-4
Bit 3
DMA Mode Select
When FIFO mode is selected (FCR0 = 1), FCR3 selects non-DMA operation (FCR3 = 0) or DMA
operation (FCR3 = 1). When FIFO mode is not selected (FCR0 = 0), this bit is not used (the
modem operates in non-DMA mode in 16450 operation).
DMA Operation in FIFO Mode
RXRDY will be asserted with the number of characters in the RX FIFO us equal to or greater
than the value in the RX FIFO Trigger Level (IIR0-IIR3 = 4h) or the received character
timeout (IIRO-IIR3 = Ch) has occurred. RXTDY will go inactive when there are no more
characters in the RX FIFO.
TXRDY will be asserted when there are one or more empty (unfilled) locations in the TX
FIFO. TXRDY will go inactive when the TX FIFO is completely full.
Non-DMA Operation in FIFO Mode
RXRDY will be asserted when there are one or more characters in the RX FIFO. RXRDY will
go inactive when there are no more characters in the RX FIFO.
TXRDY will be asserted when there are no characters in the TX FIFO. TXRDY will go
inactive when the character is loaded into the TX FIFO Buffer.
Bit 2
Bit 1
Bit 0
TX FIFO Reset
When FCR2 is a 1, all bytes in the TX FIFO are cleared. This bit is cleared automatically by the
modem.
RX FIFO Reset
When FCR1 is a 1, all bytes in the RX FIFO are cleared. This bit is cleared automatically by the
modem.
FIFO Enable
When FCR0 is a 0, 16450 mode is selected and all bits are cleared in both FIFOs. When FCR0
is a 1, FIFO mode (16550A) is selected and both FIFOs are enabled. FCR0 must be a 1 when
other bits in the FCR are written or they will not be acted upon.
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IIR – Interrupt Identifier Register (Addr = 2)
The Interrupt Identifier Register (IIR) identifies the existence and type of up to five prioritized pending
interrupts. Four priority levels are set to assist interrupt processing in the host. The four levels, in
order of decreasing priority, are Highest: Receiver Line Status, 2: Receiver Data Available or
Receiver Character Timeout. 3: TX Buffer Empty, and 4: Modem Status.
When the IIR is accessed, the modem freezes all interrupts and indicates the highest priority interrupt
pending to the host. Any change occurring in interrupt conditions are not indicated until this access is
complete.
Bits 7-6
Bits 5-4
Bits 3-1
FIFO Mode
These two bits copy FCR0.
Not Used
Always 0.
Highest Priority Pending Interrupt
These three bits identify the highest priority pending interrupt (Table 4-2). Bit 3 is applicable
only when FIFO mode is selected; otherwise, bit 3 is a 0.
Bit 0
Interrupt Pending
When this bit is a 0, an interrupt is pending; IIR bits 1-3 can be used to determine the source
of the interrupt. When this bit is a 1, an interrupt is not pending.
Table 4–2. Interrupt Sources and Reset Control
Interrupt Identification Register
Bit 3 Bit 2 Bit 1 Bit 0 Priority Interrupt Type
Interrupt Set and Reset Functions
Interrupt Source
Interrupt Reset
Control
(Note 1)
Level
0
0
0
1
0
1
1
0
—
None
None
—
Highest Receiver Line
Status
Overrun Error (OE) (LSR1),
Parity Error (PE) (LSR2),
Framing Error (FE) (LSR3),
or Break Interrupt (BI) (LSR4)
Received Data Available
(LSR0)
Reading the LSR
0
1
1
1
0
0
0
0
2
2
Received Data
Available
Reading the RX
Buffer or the RX
FIFO drops
or RX FIFO Trigger Level
(FCR6-FCR7)
below the
Reached1
Trigger Level
Reading the RX
Buffer
Character Timeout The RX FIFO contains at
Indication1
least 1 character and no
characters have been
removed from or input to the
RX FIFO during the last 4
character times.
0
0
0
0
1
0
0
0
3
4
TX Buffer Empty
Modem Status
TX Buffer Empty
Reading the IIR
or writing to the
TX Buffer
Reading the
MSR
Delta CTS (DCTS) (MSR0),
Delta DSR (DDST) (MSR1),
Trailing Edge Ring Indicator
(TERI) (MSR3), or Delta
DCD (DCD) (MSR4)
Notes:
1. FIFO Mode only.
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LCR – Line Control Register (Addr = 3)
The Line Control Register (LCR) specifies the format of the asynchronous data communications
exchange.
Bit 7
Bit 6
Bit 5
Divisor Latch Access Bit (DLAB)
This bit must be set to a 1 to access the Divisor Latch Registers during a read or write operation.
It must be reset to a 0 to access the Receiver Buffer, the Transmitter Buffer, or the Interrupt
Enable Register.
Set Break
When bit 6 is a 1, the Transmit data is forced to the break condition, i.e., space (0) is sent. When
bit 6 is a 0, break is not sent. The Set Break bit acts only on the Transmit data and has no effect
on the serial in logic.
Stick Parity
When Parity is enabled (LCR3 = 1) and stick parity is selected (LCR5 = 1), the parity bit is
transmitted and checked by the receiver as a 0 if even parity is selected (LCR4 – 1) or a 1 if odd
parity is selected (LCR4 = 0). When the stick parity is not selected (LCR3 = 0), parity is transmit
and checked as determined by the LCR3 and LCR4 bits.
Bit 4
Bit 3
Bit 2
Even Parity Select (EPS)
When parity is enabled (LCR3 = 1) and stick parity is not selected (LCR5 = 0), the number of 1s
transmitted or checked by the receiver in the data word bits and parity bit is either even (LCR4 =
1) or odd (LCR4 = 0).
Enable Parity (PEN)
When bit 3 is a 1, a parity bit is generated in the serial out (transmit) data stream and checked in
the serial in (receive) data stream as determined by the LCR4 and LCR5 bits. The parity bit is
located between the last data bit and the first stop bit.
Number of Stop GBITS (STB)
This bit specifies the number of stop bits in each serial out character. If bit 2 is a 0, one stop bit is
generated regardless of word length. If bit 2 is a 1 and 5-bit word length is selected, one and
one-half stop bits are generated. If bit 2 is a 1 and 6-, 7-, or 8-bit word length is selected, two
stop bits are generated. The serial in logic checks the first stop bit only, regardless of the number
of stop bits selected.
Bit 1-0 Word Length Select (WLS0 and WLS1)
These two bits specify the number of bits in each serial in or serial out character. The encoding
of bits 0 and 1 is:
Bit 1
Bit 0
Word Length
5 Bits (Not supported)
6 Bits (Not supported)
7 Bits
0
0
1
1
0
1
0
1
8 Bits
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
MCR – Modem Control Register (Addr = 4)
The Modem Control Register (MCR) controls the interface with modem or data set.
Bit 7-5 Not used
Always 0
Bit 4
Local Loopback
When this bit is set to a 1, the diagnostic mode is selected and the following occurs:
1. Data written to the Transmit Buffer is looped back to the Receiver Buffer.
2. The DTS (MCR0), RTS (MCR1), Out1 (MCR2), and Out2 (MCR3) modem control register
bits are internally connected to the DSR (MSR5), CTS (MSR4), RI (MSR6), and DCD
(MSR7) modem status register bits, respectively.
Bit 3
Bit 2
Bit 1
Output 2
When this bit is a 1, HINT is enabled. When this bit is a 0, HINT is in the high impedance state.
Output 1
This bit is used in local loopback (see MCR4).
Request to Send (RTS)
This bit controls the Request to Send (RTS) function. When this bit is a 1, RTS is on. When this
bit is a 0, RTS is off.
Bit 0
Data Terminal Ready (DTR)
This bit controls the Data Terminal Ready (DTR) function. When this bit is a 1, DTR is on. When
this bit is a 0, DTR is off.
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LSR – Line Status Register (Addr = 5)
This 8-bit register provides status information to the host concerning data transfer.
Bit 7
RX FIFO Error
In the 16450 mode, this bit is not used and is always 0.
In the FIFO mode, this bit is set if there are one or more characters in the RX FIFO with parity
error, framing error, or break indication detected. This bit is reset to a 0 when the host reads the
LSR and note of the above conditions exist in the RX FIFO.
Bit 6
Transmitter Empty (TEMT)
This bit is set to a 1 whenever the TX Buffer (THR) and equivalent of the Transmitter Shift
Register (TRS) are both empty. It is reset to a 0 whenever either the THR or the equivalent of the
TSR contains a character.
In the FIFO mode, this bit is set to a 1 whenever the TX FIFO and the equivalent of the TSR are
both empty
Bit 5
Transmitter Holding Register Empty (THRE) [TX Buffer Empty]
This bit, when set, indicates that the TX Buffer is empty and the modem can accept a new
character for transmission. In addition, this bit causes the modem to issue an interrupt to the host
when the Transmit Holding Register Empty Interrupt Enable bit (IIR1) is set to 1. The THRE bit is
set to a 1 when a character is transferred from the TX Buffer. The bit is reset to 0 when a byte is
written into the TX Buffer by the host.
In the FIFO mode, this bit is set when the TX FIFO is empty; it is cleared when at lease one byte
is in the TX FIFO.
Bit 4
Bit 3
Break Interrupt (BI)
This bit is set to a 1 whenever the received data input is a space (logic 0) for longer than two full
word lengths plus 3 bits. The BI is reset when the host reads the LSR.
Framing Error (FE)
This bit indicates that the received character did not have a valid stop bit. The FE bit is set to a 1
whenever the stop bit following the last data bit or parity bit is detected as a logic o (space). The
FE bit is reset to a 0 when the host reads the LSR.
In the FIFO mode, the error indication is associated with the particular character in the FIFO it
applies to. The FE bit set to a 1 when this character is loaded into the RX Buffer.
Bit 2
Parity Error (PE)
This bit indicates that the received data character in the RX Buffer does not have the correct
even or odd parity, as selected by the Even Parity Select bit (LCR4) and the Stick Parity bit
(LCR5). The PE bit is reset to a 0 when the host reads the LSR.
In the FIFO mode, the error indication is associated with the particular character in the FIFO it
applies to. The PE bit set to a 1 when this character is loaded into the RX Buffer.
Bit 1
Bit 0
Overrun Error (OE)
This bit is set to a 1 whenever received data is loaded into the RX Buffer before the host has
read the previous data from the RX Buffer. The OE is reset to a 0 when the host reads the LSR.
In the FIFO mode, if data continues to fill beyond the trigger level, an overrun condition will occur
only if the RX FIFO is full and the next character has been completely received.
Receiver Data Ready (DR)
This bit is set to a 1 whenever a complete incoming character has been received and transferred
into the RX Buffer. The DR bit is reset to a 0 when the host reads the RX Buffer.
In the FIFO mode, the DR bit is set when the number of received data bytes in the RX FIFO
equals or exceeds the trigger level specified in the FCR0-FCR1.
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MSR – Modem Status Register (Addr = 6)
The Modem Status Register (MSR) reports current state and change information of the modem. Bits
4-7 supply current state, and bits 0-3 supply change information. The change bits are set to a 1
whenever a control input form the modem changes state from the last MSR read by the host. Bits 0-3
are reset to 0 when the host reads the MSR or upon reset.
Whenever bits 0, 1, 2, or 3 are set to a 1, a Modem Status Interrupt (IIR0-IIR3 = 0) is generated.
Bit 7
Bit 6
Bit 5
Bit 4
Data Carrier Detect (DCD)
This bit indicates the logic state of the DCH# (RLSD#) output. If Loopback is selected (MCR4 =
1), this bit reflects the state of the Out2 bit in the MCR (MCR3).
Ring Indicator (RI)
This bit indicates the logic state of the RI# output. If Loopback is selected (MCR4 = 1), this bit
reflects the state of the Out1 bit in the MCR (MCR2).
Data Set Ready (DSR)
This bit indicates the logic state of the DSR# output. If Loopback is selected (MCR4 = 1), this bit
reflects the state of the DTR in the MCR (MCR0).
Clear to Send (CTS)
This bit indicates the logic state of the CTS# output. If Loopback is selected (MCR4 = 1), this bit
reflects the state of the RTS bit in the MCR (MCR1).
Bit 3
Bit 2
Delta Data Carrier Detect (DDCD)
This bit is set to a 1 when the DCD bit changes state since the host last read the MSR.
Trailing Edge of Ring Indicator (TERI)
This bit is set to a 1 when the RI bit changes from a 1 to a 0 state since the host last read the
MSR.
Bit 1
Bit 0
Delta Data Set Ready (DDSR)
This bit is set to a 1 when the DSR bit has changed since the host last read the MSR.
Delta Clear to Send (DCTS)
This bit is set to a 1 when the CTS bit has changed since the MSR the host last read the MSR.
RBX – RX Buffer (Receiver Buffer Register) (Addr = 0,
DLAB = 0)
The RX Buffer (RBR) is a read-only register at location 0 (with DLAB = 0). Bit 0 is the least significant
bit of the data and is the first bit received.
THR – TX Buffer (Transmitter Holding Register) (Addr = 0,
DLAB = 0)
The TX Buffer (THR) is a write-only register at address 0 when DLAB = 0. Bit 0 is the least significant
bit and the first bit sent.
Divisor Registers (Addr = 0 and 1, DLAB = 1)
The Divisor Latch LS (least significant byte) and Divisor Latch MS (most significant byte) are two
read-write registers at locations 0 and 1 when DLAB = 1, respectively.
The baud rate is selected by loading each divisor latch with the appropriate hex value.
Programmable values corresponding to the desired baud rate are listed in Table 4-3.
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
SCR – Scratch Register (Addr = 7)
The Scratchpad Register is a read-write register at location 7. This register is not used by the modem
and can be used by the host for temporary storage.
Divisor Latch (Hex)
MS
06
04
03
01
00
00
00
00
00
00
00
00
00
00
00
LS
00
17
00
80
C0
60
30
18
0C
06
04
03
02
01
00
Divisor (Decimal)
Baud Rate
75
1536
1047
768
384
192
96
48
24
12
6
110
150
300
600
1200
2400
4800
9600
19200
28800
38400
57600
115600
230400
4
3
2
1
NA
Table 4–3. Programmable Baud Rates
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Chapter 4 – SocketModem Parallel Interface – A Programmer's Description
Receiver FIFO Interrupt Operation
Receiver Data Available Interrupt
When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (RX Data Available) is enabled
(IER0 = 1), receiver interrupt operation is as follows:
1. The Receiver Data Available Flag (LSR0) is set as soon as a received data character is
available in the RX FIFO. LSR0 is cleared when RX FIFO is empty.
2. The Receiver Data Available Interrupt code (IIR0-IIR4 = 4h) is set whenever the number of
received data bytes in the RX FIFO reaches the trigger level specified by FCR6-FCR7 bits. It
is cleared whenever the number of received data bytes in the RX FIFO drops below the
trigger level specified by FCR6-FCR7 bits.
3. The HINT interrupt is asserted whenever the number of received data bytes in the RX FIFO
reaches the trigger level specified by FCR6-FCR7 bits. HINT interrupt is de-asserted when
the number of received data bytes in the RX FIFO drops below the trigger level specified by
FCR6-FCR7 bits.
Receiver Character Timeout Interrupts
When the FIFO mode is enabled (FCR0 = 1) and receiver interrupt (Receiver Data Available) is
enabled (IER0 = 1), receiver character timeout interrupt operation is as follows:
1. A Receiver character timeout interrupt code (IIR0-IIR3 = Ch) is set if at least one received
character is in the RX FIFO, the most recent received serial character was longer than four
continuous character times ago (if 2 stop bits are specified, the second stop bit is included in
this time period), and the most recent host read of the RX FIFO was longer than four
continuous character times ago.
Transmitter FIFO Interrupt Operation
Transmitter Empty Interrupt
When the FIFO mode is enabled (FCR0 = 1) and transmitter interrupt (TX Buffer Empty) is enabled
(IER0 =1), transmitter interrupt operation is as follows:
1. The TX Buffer Empty interrupt code (IIR0-IIR3 = 2h) will occur when the TX Buffer is empty. It
is cleared when the TX Buffer is written to (1 to 16 characters) or the IIR is read.
2. The TX Buffer Empty indications will be delayed 1 character time minus the last stop bit time
whenever the following occur: THRE = 1 and there have not been at least two bytes at the
same time in the TX FIFO Buffer since the last setting of THRE was set. The first transmitter
interrupt after setting FCR0 will be immediate.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Chapter 5 – AT Commands, S-
Registers, and Result Codes
Introduction
The AT commands are used to control the operation of your modem. They are called AT commands
because the characters AT must precede each command to get the ATtention of the modem.
AT commands can be issued only when the modem is in command mode or online command mode. The
modem is in command mode whenever it is not connected to another modem. The modem is in data
mode whenever it is connected to another modem and ready to exchange data. Online command mode is
a temporary state in which you can issue commands to the modem while connected to another modem.
To put the modem into online command mode from data mode, you must issue an escape sequence
(+++) followed immediately by the AT characters and the command, e.g., +++ to hang up the modem. To
return to data mode from online command mode, you must issue the command ATO.
To send AT commands to the modem you must use a communications program, such as the
HyperTerminal applet in Windows 98/95 and NT 4.0, or some other available terminal program. You can
issue commands to the modem either directly, by typing them in the terminal window of the
communications program, or indirectly, by configuring the operating system or communications program
to send the commands automatically. Fortunately, communications programs make daily operation of
modems effortless by hiding the commands from the user. Most users, therefore, need to use AT
commands only when reconfiguring the modem, e.g., to turn autoanswer on or off.
The format for entering an AT command is ATXn, where X is the command, and n is the specific value for
the command, sometimes called the command parameter. The value is always a number. If the value is
zero, you can omit it from the command; thus, AT&W is equivalent to AT&W0. Most commands have a
default value, which is the value that is set at the factory. The default values are shown in the “AT
Command Summary” (See below).
You must press ENTER (depending on the terminal program it could be some other key) to send the
command to the modem. Any time the modem receives a command, it sends a response known as a
result code. The most common result codes are OK, ERROR, and the CONNECT messages that the
modem sends to the computer when it is connecting to another modem. See “Result Codes” at the end of
this chapter for a table of valid result codes.
You can issue several commands in one line, in what is called a command string. The command string
begins with AT and ends when you press ENTER. Spaces to separate the commands are optional; the
command interpreter ignores them. The most familiar command string is the initialization string, which is
used to configure the modem when it is turned on or reset, or when your communications software calls
another modem.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Data Commands
The modem will respond to the commands detailed below. Parameters applicable to each command are
listed with the command description.
Generic Modem Control Commands
Command:
Z
Soft Reset and Restore Profile
Causes the modem to perform a soft reset and restore (recall) the
configuration profile. If no value is specified, zero is assumed.
None
Number corresponding to the selected profile:
Z0 Soft reset and restore stored profile 0.
Z1 Soft reset and restores stored profile 1.
OK
Description:
Default:
Values:
Result Codes:
Otherwise ERROR
Command: +FCLASS Select Active Service Class
Description:
Default:
Selects the active service class (mode).
0
Defined Values:
+FCLASS=0
+FCLASS=1
Select Data Mode (Section 3) (Default).
Select Facsimile Class 1 Mode.
+FCLASS=1.0 Select Facsimile Class 1.0 Mode.
+FCLASS=8 Select Voice Mode.
+FCLASS=10 Reserved.
Result Codes:
OK
Otherwise ERROR
Report Commands:
+FCLASS?
Reports Current or Selected Values
+FCLASS=? Reports Range of Parameters
Command: +VCID
Description:
Caller ID (CID)
Controls the reporting and presentation of data associated with the Caller
ID services in the Incoming Call Line ID (ICLID) data format for the next
call. (U.S. only)
0
Default:
Defined Values:
+VCID0
+VCID1
Disable Caller ID reporting.
Enables Caller ID with formatted presentation to the DTE. The
modem presents the data items in a <Tag><Value> pair
format. The expected pairs are date, time, name, and caller
code (telephone number).
+VCID2
+VCID?
Enables Caller ID with unformatted presentation to the DTE.
Reports the Mode
Report Commands:
+VCID=? Reports Range of Parameters
Command: +VRID
Report Retrieved Caller ID (CID)
Description:
Reports the data associated with the Caller ID services in the Incoming
Caller Line (ICLID) data format for the last received call. U.S. only
None
Default:
Defined Values:
+VRID0
Reports Caller ID with formatted presentation to the DTE. The
modem presents the data items in a <Tag><Value> pair
format. The expected pairs are date, time, name, and caller
code (telephone number).
+VRID1
+VRID?
Reports Caller ID with unformatted presentation to the DTE.
Reports the Mode
Report Commands:
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: \N
Description:
Operating Mode - Error Correction
Controls the preferred error-correcting mode to be negotiated in a
subsequent data connection. This command is affected by the OEM
firmware configuration.
Default:
5
Defined Values:
\N0 Selects normal speed buffered mode (disables error-correction
mode). (Forces &Q6.)
\N1 Serial interface selected: Selects direct mode and is equivalent to
&M0, Q0 mode of operation. (Forces &Q0.) Parallel interface
selected: Same as \N0.
\N2 Selects reliable (error-correction) mode. The modem will first attempt
a LAPM connection and then an MNP connection. Failure to make a
reliable connection results in the modem hanging up. (Forces &Q5,
S36=4, and S48=7.)
\N3 Selects auto-reliable mode. This operates the same as \N2 except
failure to make a reliable connection results in the modem falling
back to the speed buffered normal mode. (Forces &Q5, S36=7, and
S48=7.)
\N4 Selects LAPM error-correction mode. Failure to make an LAPM
error-correction connection results in the modem hanging up.
(Forces &Q5 and S48=0.) Note: The -K1 command can override the
\N4 command.
\N5 Selects MNP error-correction mode. Failure to make an MNP error-
correction connection results in the modem hanging up. (Forces
&Q5, S36=4, and S48=128.)
Result Codes:
OK
Otherwise ERROR
Command
Description:
I
Identification
Causes the modem to reports the requested result according to the
command parameter.
4
Default:
Defined Values:
I0
Reports product code (e.g., 56000).
I1
Reports the least significant byte of the stored checksum (e.g.,
12AB).
I2
I3
I4
Checks ROM and verifies the checksum. Reports OK or ERROR.
Reports ROM Code Revision-Modulation (e.g., 2109-V90).
Reports OEM defined identifier string in binary format (default) or
ASCII formats. (e.g.: a007040284C6002F bC60000000
r1005111151012000 3000111170000000).
I5
I6
Reports Country Code parameter (see +GCI).
Reports modem data pump model and internal code revision.
Result Codes:
OK
Otherwise ERROR
Command: +GMI
Description:
Request Manufacturer Identification
Causes the modem to report the modem product manufacturer.
Typical Response:
+GMI: Multi-Tech
OK
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command
+GMM
Request Model Identification
Causes the modem to report the modem product.
+GMM: V92
Description:
Typical Response:
Command:
Description:
+GMR
Request Revision Identification
Causes the modem to report the modem version, revision level, or date.
This is the same as the I3 command.
Typical Response:
+GMR: P2109-V90
OK
Command: +GCAP
Description:
Request Complete Capabilities List
This extended-format command causes the modem to transmit one or
more lines of information text listing additional capabilities command
+<name>s, which is intended to permit the user to identify the overall
capabilities of the modem. In particular, if the modem implements a
particular modem control standard that uses Extended Syntax Commands,
and if that modem control standard includes command(s) that indicate
general capabilities, the +<names>(s) of those commands will be reported
to the modem in response to a +GCAP command.
Example Responses:
+GCAP: +FCLASS, +MS, +ES, +DS, for a data modem that supports all
capabilities listed. Where:
+MS
+ES
+DS
+M commands (Modulation Control: +MS and +MR commands)
+E commands (Error Control: +ES, +EB, +ER, +EFCS, +ETBM)
+D commands (Data Compression: +DS and +DR). Manual
Command: +GCI
Description:
Country of Installation
This extended syntax command selects and indicates the country of
installation for the modem. This parameter selects the settings for any
operational parameters that need to be adjusted for national regulations or
telephone networks. The chapter Setting Country Codes for more
information.
Default:
If the modem is specified for use in only one country, that country code is
the default. Otherwise, the default is defined by the OEM. Factory default is
B5 (United States).
Report Commands:
+GCI?
Reports the current country code.
+GCI=? Displays the list of available country codes.
Command: &F
Restore Factory Configuration (Profile)
The modem loads the factory default configuration (profile). The factory
defaults are identified for each command and in the S-Parameter
descriptions. A configuration (profile) consists of a subset of S-Parameters.
None
Description:
Default:
Values:
&F0 Restore factory configuration 0.
&F Restore factory configuration 1.
Result Codes:
OK
ERROR if the modem is connected.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: &T
Description:
Local Analog Loopback Test
The modem will perform the local analog loopback test if &T1 is selected.
The test can be run only when in an asynchronous operation in non-error-
correction mode (normal), e.g., AT&Q6. To terminate the test in progress,
the escape sequence must be entered first.
Default:
None
Defined Values:
&T0 Terminates test in progress. Clears S16.
&T1 Initiates local analog loopback, V.54 Loop 3. Sets S16 bit 0. If a
connection exists when this command is issued, the modem hangs
up. The CONNECT XXXX message is displayed upon the start of
the test.
Command: &Y
Description:
Designate a Default Reset Profile
Selects which user profile will be used after a hard reset.
Default:
None
Defined Values:
&Y0 The modem will use profile 0.
&Y1 The modem will use profile 1.
Result Codes:
OK
ERROR if <value> > is1 or if NVRAM is not installed or is not operational.
Command: &W
Description:
Store Current Configuration
Saves the current (active) configuration (profile), including S-Parameters,
in one of the two user profiles in NVRAM as denoted by the parameter
value. This command will yield an ERROR message if the NVRAM is not
installed or is not operational as detected by the NVRAM test.
The current configuration is comprised of a list of storable parameters
illustrated in the &V command. These settings are restored to the active
configuration upon receiving a Z command or at power up (see &Y
command).
Default:
0
Defined Values:
&W0 Store the current configuration as profile 0.
&W1 Store the current configuration as profile 1.
OK
Result Codes:
Otherwise ERROR
Command
Description:
&Zn=x
Store Telephone Number
The modem can store up to four telephone numbers and each telephone
number dial string can contain up to 31 digits. (Requires 256-byte NVRAM
installed.)
Default:
None
Defined Values:
Result Codes:
<string> Dial string from 0 to 31 characters.
OK For <value> =3, and <string> =31 digits.
ERROR If <value> > 3, <string> > 31 digits, or if NVRAM is not installed or
is not operational.
Command
%7
Plug and Play Serial Number
Description:
Sets and stores eight serial numbers in hex format used for serial Plug and
Play and for ISA Plug and Play which use the Conexant 11596 Plug and
Play device. Applicable to Desktop configuration only.
%7<8 hex numbers><same 8 hex numbers>
OK <8 hex numbers><same 8 hex numbers>
Otherwise ERROR
Example:
Result Codes:
Report Command:
AT"? Reports the stored serial number, issue.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command
%8
Plug and Play Vendor ID and Product Number
Description:
Sets and stores Vendor ID and product number for serial Plug and Play
and for ISA Plug and Play which use the Conexant 11596 Plug and Play
device. Applicable to Desktop configuration only.
None
Default:
Example:
%8<3 ASCII characters><4 hex numbers><same 3 ASCII
characters><same 4 hex numbers><cr>
Result Codes:
OK <3 ASCII characters><4 hex numbers><same 3 ASCII
characters><same 4 hex numbers>
Otherwise ERROR
Command
Description:
**
Load Flash Memory
The linear flash memory uploader allows flash memory connected to the
modem external memory bus to be upgraded with revised modem
firmware. This process transfers (uploads) the upgraded modem firmware
(data) from the host computer to the modem which transfers the data to the
flash memory device. The linear flash memory downloader allows the flash
memory connected to the modem external memory bus to read and saved.
This process transfers (downloads) the current modem firmware (data) to
the host computer. Uploading new firmware to the flash memory or
downloading existing firmware from the flash memory device is a two-step
process.
1. When the AT** command is issued, the modem firmware boot loader is
invoked and the user will first load a flash load module (FLM) into the
modem's RAM. If the user wishes to upload new firmware to the
modem, he should load the uploader FLM. If the user wishes to
download existing firmware from the modem, he should load the
downloader FLM. In either case, the data transfer is done via an ASCII
transfer. The FLM contains the programming algorithm for the flash
memory device being programmed and any messages that may be sent
during the load process.
2. If the user wishes to upload new firmware to the modem, then he will
then load the new modem firmware, which the uploader FLM will then
program into the flash memory device. This transfer is done via
XMODEM transfer. If the user wishes to download existing firmware
from the modem, then he will set up the host PC for XMODEM receive
and the downloader FLM will begin to send the existing firmware from
the flash memory to the host PC.
Procedure
1. Install in the modem a flash memory programmed with the modem
firmware or a blank flash memory.
2. Put the uploader FLM and downloader FLM files and the new modem
firmware file (e.g., XmUL003.s37, XmDL003.s37, and 206s4712.S37)
in an appropriate directory on the computer's hard disk.
3. Configure the communications application program for a DTE rate of
between 9600 bps and 115200 bps and RTS/CTS flow control.
4. Check the modem for response by typing AT.
5. Initiate the download process using the AT** command. The
"Download flash code…" message appears upon issuing the AT**
command.
6. Perform an ASCII transfer of the FLM file (e.g., XmUL003.s37 for
uploading new firmware to the modem or XmDL003.s37 for
downloading existing firmware from the modem) from the host
computer to the modem RAM using an industry standard
communications software or an equivalent process (ensure that all
ASCII translation or pacing is turned off).
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Chapter 5 – AT Commands, S-Registers, and Result Codes
7. After the FLM has been loaded, if uploading new firmware to the
modem, perform an XMODEM upload of the new modem firmware hex
file (e.g., 206s4712.S37) from the host computer to the modem RAM
using industry standard communications software or an equivalent
process. If downloading existing firmware from the modem, using an
industry standard communications software or equivalent, put the host
PC in XMODEM receive mode.
8. The messages described in Table 5-1 may occur during the uploading
process:
Table 5-1. Upload Messages
Message
Description
Device not supported
Wrong S37 format
Record error
Displayed if the FLM used does not support the flash
memory that is installed on the board.
Displayed if the modem firmware being uploaded is not in
Motorola S3 format.
Displayed if there is an error while either uploading or
downloading. If this occurs, the transfer should be aborted,
and the user should restart at step .5
Download abort
Erase fail
Displayed if the transfer is aborted before it is finished. If this
occurs, the user should restart at step 5.
Displayed if the FLM is unable to erase the flash memory. If
this occurs, the user should restart at step 5.
Download error, Re-
Load
Error, No H/W flow ctl
Displayed if there was an error when uploading or
downloading. If this occurs, the user should restart at step 5.
Displayed if RTS-CTS flow control is not set. If this occurs,
the user should restart at step 3.
DTE timeout
Displayed if the DTE has stopped the XMODEM transfer
process before it is finished. If this occurs, the user should
restart at step 5.
Code doesn’t match
Hardware
Displayed if the user is attempting to upload a firmware that
either not the same model (parallel, serial, etc.), crystal
frequency, or size (1Mbit, 2Mbit, etc.) as the firmware that is
currently on the board. If this occurs, the FLM will abort and
not allow the user to continue.
Device successfully
Programmed
Displayed by the FLM at the completion of a successful
upload or download then the modem will do a cold start.
The uploader and downloader flash load modules (FLM) have several built in safety
mechanisms to reduce the risk of a failed flash upload/download. The FLM will not allow
a user to upload a firmware of different model (serial, parallel, etc.) or crystal speed than
what is currently in the flash memory. Also, it will not allow the user to upload a firmware
that is larger in size than the flash memory itself (e.g., a 2Mbit firmware onto a 1Mbit flash
memory). It will, however, allow the user to upload a firmware that is smaller in size than
the flash memory, and it will program the firmware with the appropriate offset in order for
the firmware to function properly. In the instance that there is a failure during the
download or upload process, the modem will be in a “flash rescue mode”. In this mode,
the modem will respond “OK” to all AT commands, but will only take action on the AT**
command, so a new attempt to upload or download can be initiated. When the modem is
in the “flash rescue mode” it will only be able to respond to AT commands if the DTE rate
has not been changed since the last AT** command was successfully issued, even if the
modem is powered off and on.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
DTE-Modem Interface Commands
The parameters defined in this section control the operation of the interface between the DTE and
modem.
Command:
E
Q
V
Command Echo
Description:
The modem enables or disables the echo of characters to the DTE. The
parameter value, if valid, is written to S14 bit 1.
1
E0 Disables command echo.
E1 Enables command echo.
OK
Default:
Defined Values:
Result Codes:
Otherwise ERROR
Command:
Description:
Quiet Result Code Control
Enables or disables the sending of result codes to the DTE. The parameter
value, if valid, is written to S14 bit 2.
0
Q0 Enables result codes to the DTE.
Q1 Disables result codes to the DTE.
OK
Default:
Defined Values:
Result Codes:
Otherwise ERROR
Command:
Description:
Result Code Form
Selects the sending of short-form or long-form result codes to the DTE.
The parameter, if valid, is written to S14 bit 3.
Default:
1
Defined Values:
V0 Enables short-form (terse) result codes. Line feed is not issued
before a short-form result code.
V1 Enables long-form (verbose) result codes.
OK
Result Codes:
Otherwise ERROR
Command:
W
Connect Message Control
Description:
This command, in conjunction with S95 bits 0, 2, 3, and 5 (bits 2, 3, and 5
can be written directly by the host or by the +MR, +ER, and +DR
commands, respectively), control the format of CONNECT messages. The
actual result code messages reported reflect the W command setting and
the S95 bit settings. (Also see +MR, +ER, and +DR commands.) The W
parameter value, if valid, is written to S31 bits 2 and 3.
0
Default:
Defined Values:
W0 Upon connection, the modem reports only the DTE speed (e.g.,
CONNECT 19200). Subsequent responses are disabled.
W1 Upon connection, the modem reports the modulation, line speed, the
error correction protocol, and the DTE speed, respectively.
Subsequent responses are disabled.
W2 Upon connection, the modem reports the DCE speed (e.g.,
CONNECT 14400). Subsequent responses are disabled.
OK
Result Codes:
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command:
Description:
X
Extended Result Codes
Selects the subset of the result code messages used by the modem to
inform the DTE of the results of commands. Blind dialing is enabled or
disabled by country parameters. If the user wishes to enforce dial tone
detection, a "W" can be placed in the dial string (see D command). The
information below is based upon the default implementation of the X results
table.
If the modem is in facsimile mode (+FCLASS=1, 1.0, or 2), the only
message sent to indicate a connection is CONNECT without a speed
indication. See the table of Result Codes at the end of this chapter.
4
Default:
Defined Values:
X0 Disables reporting of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER,
ERROR, and NO ANSWER result codes. Blind dialing is
enabled/disabled by country parameters. If busy tone detection is
enforced and busy tone is detected, NO CARRIER will be reported. If
dial tone detection is enforced or selected and dial tone is not
detected, NO CARRIER will be reported instead of NO DIAL TONE.
The value 000b is written to S22 bits 6, 5, and 4, respectively.
X1 Disables reporting of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER,
ERROR, NO ANSWER, and CONNECT XXXX (XXXX = rate). Blind
dialing enabled/disabled by country parameters. If busy tone
detection is enforced and busy tone is detected, NO CARRIER will
be reported instead of BUSY. If dial tone detection is enforced or
selected and dial tone is not detected, NO CARRIER will be reported
instead of NO DIAL TONE. The value 100b is written to S22 bits 6, 5,
and 4, respectively.
X2 Disables reporting of busy tones unless forced otherwise by country
requirements; send only OK, CONNECT, RING, NO CARRIER,
ERROR, NO DIAL TONE, NO ANSWER, and CONNECT XXXX. If
busy tone detection is enforced and busy tone is detected, NO
CARRIER will be reported instead of BUSY. If dial tone detection is
enforced or selected and dial tone is not detected, NO DIAL TONE
will be reported instead of NO CARRIER. The value 01b is written to
S22 bits 6, 5, and 4, respectively.
X3 Enables reporting of busy tones; send only OK, CONNECT, RING,
NO CARRIER, ERROR, NO ANSWER, and CONNECT XXXX. Blind
dialing is enabled/disabled by country parameters. If dial tone
detection is enforced and dial tone is not detected, NO CARRIER will
be reported. The value 110b is written to S22 bits 6, 5, and 4,
respectively.
X4 Enables reporting of busy tones; send all messages. The value 111b
is written to S22 bits 6, 5, and 4, respectively.
Result Codes:
OK
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: &C
Description:
RLSD (DCD) Option
The modem controls the RLSD output in accordance with the parameter
supplied. The parameter value, if valid, is written to S21 bit 5.
1
Default:
Defined Values:
0
RLSD remains ON at all times.
1
RLSD follows the state of the carrier.
Result Codes:
OK
Otherwise ERROR
Command: &D
DTR Option
Description:
Interprets the ON to OFF transition of the DTR signal from the DTE in
accordance with the parameter supplied. The parameter value, if valid, is
written to S21 bits 3 and 4. Also, see S25.
2
Default:
Defined Values:
&D0 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0, &Q5, &Q6: DTR is ignored (assumed ON). Allows operation
with DTEs, which do not provide DTR.
Q1 DTR drop causes the modem to hang up. Auto-answer is not
affected.
&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is
inhibited.
&D1 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0, &Q1, &Q5, &Q6 DTR drop is interpreted by the modem as if
the asynchronous escape sequence had been entered. The modem
returns to asynchronous Command State without disconnecting.
&Q2, &Q3 DTR causes the modem to hang up Auto-answer is
inhibited.
&D2 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0 through &Q6 drop caused the modem to hang up. Auto-answer
is inhibited.
&D3 DTR drop is interpreted according to the current &Q setting as
follows:
&Q0, &Q1, &Q5, &Q6 DTR drop causes the modem to perform a soft
reset as if the Z command were received. The &Y setting determines
which profile is loaded.
&Q2, &Q3 DTR drop causes the modem to hang up. Auto-answer is
inhibited.
If &Q5, &Q6, +FCLASS=1 or +FCLASS=2 is in effect, the action
taken is the same as for &Q0.
Command: &K
Flow Control
Description:
Defines the DTE/DCE (terminal/modem) flow control mechanism. The
parameter value, if valid, is written to S39 bits 0, 1, and 2.
3 (for data modem modes)
Default:
Defined Values:
0
3
4
5
Disables flow control.
Enables RTS/CTS flow control.
Enables XON/XOFF flow control.
Enables transparent XON/XOFF flow control.
Note: Upon reset, both RTS/CTS and XON/XOFF flow control is enabled
for fax modem and voice modes.
Result Codes:
OK
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: &R
Description:
RTS/CTS Option
This selects how the modem controls CTS. CTS operation is modified if
hardware flow control is selected (see &K command). The parameter
value, if valid, is written to S21 bit 2.
Default:
None
Defined Values:
&R0 In sync mode, CTS tracks the state of RTS; the RTS-to-CTS delay is
defined by S26. In async mode, CTS is normally ON and will turn
OFF only if required by flow control.
&R1 In sync mode, CTS is always ON (RTS transitions are ignored).
Tracks the state of RTS; In async mode, CTS is normally ON and will
turn OFF only if required by flow control.
Result Codes:
OK
Otherwise ERROR
Command: &S
Description:
DSR Override
Selects how the modem will control DSR. The parameter value, if valid, is
written to S21 bit 6.
Default:
0
Defined Values:
&S0 DSR will remain ON at all times.
&S1 DSR will become active after answer tone has been detected and
inactive after the carrier has been lost.
Result Codes:
OK
Otherwise ERROR
Command: +IPR
Description:
Fixed DTE Rate
This numeric extended-format parameter specifies the data rate at which
the modem will accept commands during online operation. It may be used
to select operation at rates at which the modem is not capable of
automatically detecting the data rate being used by the DTE. Specifying a
value of 0 disables the function and allows operation only at rates
automatically detectable by the modem. The specified rate takes effect
following the issuance of any result code(s) associated with the current
command line.
The <rate> specified does not apply in Online Data State if Normal Mode
(Direct Mode) of operation is selected.
Default:
None
Defined Values:
<rate> Specifies the DTE-modem interface operation rate in bits/s.
The available rates are 0, 300, 1200, 2400, 4800, 9600, 19200, 38400,
57600, 115200, or 230400.
If unspecified or set to 0, automatic detection is selected and the character
format is also forced to autodetect, +ICF=0.
If the rate specified is not supported by the modem, an ERROR result code
will be returned.
Report Commands:
+IPR?
Reports current rates
+IPR=? Reports current range Example: +IPR:
(0,300,1200,2400,4800,9600,19200,38400,57600,115200, 230400)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: +IFC
Description:
DTE-Modem Local Flow Control
This extended-format compound parameter controls the operation of local
flow control between the DTE and the modem during the data state when
V.42 error control is used, or when fallback to non-error control mode is
specified to include buffering and flow control.
It accepts two numeric subparameters.
Default:
2
Defined Values:
Values defined by <modem_by_DTE> Specifies the method to be used
by the DTE to control the flow of received data from the modem.
+IFC0
+IFC1
None
XON/XOFF on transmitted data (XON/XOFF on transmit data);
do not pass XON/XOFF characters to the remote modem.
Circuit 133 (Ready for Receiving).
DC1/DC3 on circuit 103 (Transmitted Data) with DC1/DC3
characters being passed through to the remote DCE in addition
to being acted upon for local flow control.
+IFC2
+IFC3
Values defined by <DTE_by_modem> Specifies the method to be used
by the modem to control the flow of transmitted data from the DTE.
+IFC0
+IFC1
+IFC2
+IFC?
None.
XON/XOFF on received data.
CTS/RTS.
Reports the current or selected values
Response: +IFC: <modem_by_DTE>,<DTE_by_modem>
Example: +IFC: 2,2 For the defaults.
Report Commands:
+IFC=? Reports the supported range of parameter values
Response: +IFC: (<modem_by_DTE> range),(<DTE_by_modem> range)
Example: +IFC: (0-3),(0-2).
Command: +ILRR
Description:
DTE-Modem Local Rate Reporting
This extended-format numeric parameter controls whether or not the
extended-format +ILRR:<rate> information text is transmitted from the
modem to the DTE.
Default:
0
Defined Values:
+ILRR0 Disables reporting of local port rate (+ILRR: is not transmitted).
+ILRR1 Enables reporting of local port rate (+ILRR: is transmitted).
+ILRR? Reports current value
+ILRR=? Reports supported range of parameter values
The <rate> reported represents the current (negotiated or renegotiated)
DTE-modem rate. If enabled, the intermediate result code is transmitted
after any modulation, error control or data compression reports are
transmitted, and before any final result code (e.g., CONNECT) is
transmitted. The <rate> is applied after the final result code is transmitted.
Report Commands:
Reported Rate:
The DTE-modem port rate will change only if neither buffered mode nor
error controlled means are enabled (+ES=x,0) and if the negotiated carrier
rate (+MRR) does not match the current DTE-modem port rate
(autodetected from the previous command line).
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Call Control Commands
Command:
Description:
D
Dial
Directs the modem to go on-line, dial according to the string entered and
attempt to establish a connection. If no dial string is supplied, the modem
will go on-line and attempt the handshake in originate mode.
Note: If the ATD command is issued before the S1 register has cleared,
the modem will respond with the NO CARRIER result code.
If +FCLASS=0 is selected, the modem will behave as a data modem and
will attempt to connect to another data modem. The modem will have up to
the period of time specified by register S6 or S7 to wait for carrier and
complete the handshake. If this time expires before the modem can
complete the handshake, the modem will go on-hook with the NO
CARRIER response. This command will be aborted in progress upon
receipt of any DTE character before completion of the handshake.
If +FCLASS=1, 1.0, or 2 is selected, the modem will behave as a facsimile
modem and attempt to connect to a facsimile machine (or modem) by
entering the HDLC V.21 channel 2 receive state (as if +FRH=3 had been
issued). This command will be aborted upon receipt of any DTE character
if the modem has not finished dialing. In this case, the modem will go on-
hook and return to command mode after displaying the NO CARRIER
message. If the modem has finished dialing, it proceeds as if the +FRH=3
command has been issued. (Refer to the +FRH command to determine
how the modem behaves following this stage.)
Dial Modifiers
The valid dial string parameters are described below. Punctuation
characters may be used for clarity, with parentheses, hyphen, and spaces
being ignored.
Defined Values:
Character string <string> corresponding to the selected option(s).
0-9 DTMF digits 0 to 9.
*
#
The 'star' digit (tone dialing only).
The 'gate' digit (tone dialing only).
A-D DTMF digits A, B, C, and D. Some countries may prohibit sending of
these digits during dialing.
L
Re-dial last number: the modem will re-dial the last valid telephone
number. The L must be immediately after the D with all the following
characters ignored).
P
Select pulse dialing: Pulse Dialing is used in the dialed numbers that
follow until a T command is encountered. Affects current and
subsequent dialing. Some countries prevent changing dialing modes
after the first digit is dialed.
T
Select tone dialing: Tone Dialing is used in the dialed numbers that
follow until a P is encountered. Affects current and subsequent
dialing. Some countries prevent changing dialing modes after the
first digit is dialed.
R
This command will be accepted, but not acted on.
S=n Dial the number stored in the directory (n = 0 to 3). (See &Z.)
!
Flash: the modem will go on-hook for a time defined by the value of
S29. Country requirements may limit the time imposed.
W
Wait for dial tone: the modem will wait for dial tone before dialing the
digits following "W". If dial tone is not detected within the time
specified by S7 (US) or S6 (W-class), the modem will abort the rest
of the sequence, return on-hook, and generate an error message.
Wait for silence: the modem will wait for at least 5 seconds of silence
in the call progress frequency band before continuing with the next
dial string parameter. If the modem does not detect these 5 seconds
@
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Chapter 5 – AT Commands, S-Registers, and Result Codes
of silence before the expiration of the call abort timer (S7), the
modem will terminate the call attempt with a NO ANSWER message.
If busy detection is enabled, the modem may terminate the call with
the BUSY result code. If answer tone arrives during execution of this
parameter, the modem handshakes.
&
Wait for credit card dialing tone before continuing with the dial string.
If the tone is not detected within the time specified by S7 (US
models) or S6 (W-class models), the modem will abort the rest of the
sequence, return on-hook, and generate an error message.
Dial pause: the modem will pause for a time specified by S8 before
dialing the digits following ",".
Return to command state. Added to the end of a dial string, this
causes the modem to return to the command state after it processes
the portion of the dial string preceding the ";". This allows the user to
issue additional AT commands while remaining off-hook. The
additional AT commands may be placed in the original command line
following the ";" and/or may be entered on subsequent command
lines. The modem will enter call progress only after an additional dial
command is issued without the ";" terminator. Use "H" to abort the
dial in progress, and go back on-hook.
,
;
^
Toggles calling tone enable/disable: applicable to current dial
attempt only.
( )
-
Ignored: may be used to format the dial string.
Ignored: may be used to format the dial string.
<space> Ignored: may be used to format the dial string.
<i> Invalid character: will be ignored.
>
If enabled by country specific parameter, the modem will generate a
grounding pulse on the EARTH relay output.
Command:
T
P
Set Tone Dial Default
Description:
Forces DTMF dialing until the next P dial modifier or P command is
received. The modem will set an S-Parameter bit to indicate that all
subsequent dialing should be conducted in tone mode. The DP command
will override this command. Clears S14 bit 5.
This command may not be permitted in some countries. (See P.)
OK
Result Code:
Command:
Description:
Set Pulse Dial Default
Forces pulse dialing until the next T dial modifier or T command is
received. Sets S14 bit 5.
As soon as a dial command is executed which explicitly specifies the
dialing mode for that particular call (e.g., ATDT...), this command is
overridden so that all future dialing will be tone dialed. (See T command.)
This command may not be permitted in some countries.
OK
Result Code:
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command:
Description:
A
Answer
The modem will go off-hook and attempt to answer an incoming call if
correct conditions are met. Upon successful completion of answer
handshake, the modem will go on-line in answer mode. This command
may be affected by the state of Line Current Sense, if enabled. (Most
countries do not require Line Current Sense.) Operation is also dependent
upon +FCLASS command and country-specific requirements.
If +FCLASS=0 is selected, the modem will enter the Connect state after
exchanging carrier with the remote modem. If no carrier is detected within
a period specified in register S7, the modem hangs up. Any character
entered during the connect sequence will abort the connection attempt.
If +FCLASS=1, 1.0, or 2 is selected, the modem will go off-hook in V.21
answer mode. It will generate the V.21 2100 Hz answer tone for 3 0.5
seconds and, following a delay of 70 ms, will proceed as if the +FTH=3
command were issued. At any stage up to (but excluding) the +FTH=3
command state, any character will abort the communication. (See the
description of the +FTH command for details.)
Command:
Description:
H
Disconnect (Hang-Up)
Initiates a hang up sequence. This command may not be available for
some countries due to PTT restrictions.
Default:
None
Defined Values:
H0 The modem will release the line if the modem is currently on-line,
and will terminate any test (AT&T) that is in progress. Country
specific, modulation specific, and error correction protocol specific
(S38) processing is handled outside of the H0 command.
H1 If on-hook, the modem will go off-hook and enter command mode.
For US models, the modem will remain off-hook. For W-class
models, the modem will return on-hook after a period of time
determined by S7.
Result Codes:
OK
Otherwise ERROR
Command:
Description:
O
Return to Online Data Mode
Determines how the modem will enter the online data mode. If in the online
command mode, the modem enters the online data mode with or without a
retrain. If in the off-line command mode (no connection), the modem
reports ERROR.
Default:
None
Defined Values:
O0 Enters on-line data mode without a retrain.
Handling is determined by the Call Establishment task. Generally, if
a connection exists, this command connects the DTE back to the
remote modem after an escape (+++).
O1 Enters on-line data mode with a retrain before returning to on-line
data mode.
O2 Fast retrain without speed change (used for diagnostic purpose
only).
O3 Renegotiate rate without speed change (used for diagnostic purpose
only.
O4 Renegotiate rate down one speed (used for diagnostic purpose
only).
O5 Renegotiate rate up one speed (used for diagnostic purpose only).
OK
Result Codes:
Otherwise ERROR (or if not connected)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command:
Description:
L
Speaker Volume
Sets the speaker volume control. The parameter value, if valid, is written to
S22 bits 0 and 1.
1
Default:
Defined Values:
L0
L1
L2
L3
OK
Low volume.
Low volume. (Default.)
Medium volume.
High volume.
Result Codes:
Otherwise ERROR
Command:
Description:
M
Speaker Control
Selects when the speaker will be on or off. The parameter value, if valid, is
written to S22 bits 2 and 3.
Default:
1
Defined Values:
M0 Speaker is always off.
M1 Speaker is on during call establishment, but off when receiving
carrier. (Default.)
M2 Speaker is always on.
M3 Speaker is off when receiving carrier and during dialing, but on
during answering.
OK
Result Codes:
Otherwise ERROR
Command: &G
Description:
Select Guard Tone
Causes the modem to generate the guard tone selected by this command
(DPSK modulation modes only). The parameter value, if valid, is written to
S23 bits 6 and 7.
This command may not be permitted in some countries.
Default:
0
Defined Values:
&G0 Disables guard tone. (Default.)
&G1 Disables guard tone.
&G2 Selects 1800 Hz guard tone.
<value> = 0 to 2
Result Codes:
Otherwise ERROR
Command: &P
Description:
Select Pulse Dial Make/Break Ratio
Determines the make/break ratio used during pulse dialing. The default is
country-dependent. The parameter value, if valid, is written to S28 bits 3
and 4.
Default:
0
Defined Values:
&P0 Selects 39%-61% make/break ratio at 10 pulses per second.
&P1 Selects 33%-67% make/break ratio at 10 pulses per second.
&P2 Selects 39%-61% make/break ratio at 20 pulses per second.
&P3 Selects 33%-67% make/break ratio at 20 pulses per second.
OK
Result Codes:
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: &V
Display Current Configuration and Stored Profiles
Description:
Reports the current (active) configuration, the stored (user) profiles, and
the first four stored telephone numbers. The stored profiles and telephone
numbers are not displayed if the NVRAM is not installed or is not
operational as detected by the NVRAM test during reset processing.
OK
Result Code:
Example:
AT&V
ACTIVE PROFILE:
B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5
&R1 &S0 &T5 &X0
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002
S07:050 S08:002 S09:006
S10:014 S11:095 S12:050 S18:000 S25:005 S26:001 S36:007
S38:020 S46:138
S48:007 S95:000
STORED PROFILE 0:
B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5
&R1 &S0 &T5 &X0
S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014
S11:095 S12:050 S18:000
S36:007 S40:104 S41:195 S46:138 S95:000
STORED PROFILE 1:
B1 E1 L1 M1 N0 QO T V1 W0 X4 Y0 &C1 &D2 &G0 &J0 &K3 &Q5
&R1 &S0 &T5 &X0
S00:000 S02:043 S06:002 S07:050 S08:002 S09:006 S10:014
S11:095 S12:050 S18:000
S36:007 S40:168 S41:195 S46:138 S95:000
TELEPHONE NUMBERS:
0 = 1 =
2 = 3 =
OK.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: &V1
Description:
Display Last Connection Statistics
Displays the last connection statistics in the following format (shown with
typical results):
TERMINATION REASON
LAST TX rate
HIGHEST TX rate
LAST RX rate.
HIGHEST RX rate
PROTOCOL
COMPRESSION
Line QUALITY
Rx LEVEL
LOCAL REQUEST
26400 BPS
26400 BPS
49333 BPS
49333 BPS
LAPM
V42Bis
038
015
Highest Rx State
Highest TX State
EQM Sum
67
67
00B4
0000
Min Distance
RBS Pattern
00
Rate Drop
00
Digital Loss
2000
Local Rtrn Count
Remote Rtrn Count
Flex 9481814347C4
00
00
RBS Pattern: Shows which bits are being robbed in the least significant 6
bytes, e.g., 03 indicates 2 robbed bits in bit positions 0 and 1.
Digital Loss: Shows if a pad was encountered and if so, what was the digital
loss. 2000 means 0dB.
Flex: Shows V.8bis information as follows:
First byte: Octet 13 (second byte of manufacturer id, 94 = 56K)
Second byte: Octet 14 (Licensee code: 81 = Conexant)
Third byte: Octet 15 (manufacturer's product capabilities)
Fourth byte: Octet 16 (56K version number)
Fifth byte: Octet 17 (Conexant pump code version number)
Sixth byte: Octet 18 (x-law and controller version number)
Bit 6 Forced/Not forced A-Law/µ-Law
0 = Forced A-Law/µ-Law.
1 = Not forced A-Law/µ-Law.
Bit 5 Select A-Law or µ-Law
0 = Select A-Law.
1 = Select µ-Law.
Bit 4:0 Controller version
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: \V
Description:
Default:
Single Line Connect Message Enable
Enables or disables the single-line connect message format as follows:
None
Defined Values:
\V0 Connect messages are controlled by the command settings X, W,
and S95.
\V1 Connect messages are displayed in the single line format described
below subject to the command settings V (Verbose) and Q (Quiet). In
Non-Verbose mode (V0), single line connect messages are disabled
and a single numeric result code is generated for CONNECT DTE.
When single line connect messages are enabled, there are no CARRIER,
PROTOCOL (+ER:), or COMPRESSION (+DR:) messages apart from the
fields described below.
The single line connect message format is:
CONNECT <DTE
Speed>/<Modulation>/<Protocol>/<Compression>/<Line Speed>
Where:
DTE Speed =
DTE speed, e.g., 57600.
Modulation =
“V92” for V.92 modulation.
“V90” for V.90 modulation.
“K56” for 56K modulation.
“V34” for V.34 modulation.
“V32” for V.32 or V.32bis modulation.
Note: Modulation is omitted for all other modulations.
“NONE” for no protocol.
Protocol =
“ALT” for Microcom Network Protocol.
“LAPM” for LAP-M protocol.
Compression = “V44” for V.44 compression.
“V42B” for V.42bis compression.
“ALT” for Microcom MNP5 compression.
Note: Compression is omitted if protocol is NONE.
Asymmetric rates are displayed as “/rate:TX/rate:RX”,
e.g., /1200 TX/75 RX.
Line Speed =
Symmetric rates are displayed as a single DCE rate,
e.g., 14400.
Command: %L
Description:
Report Line Signal Level
Returns a value, which indicates the received signal level. The value
returned is a direct indication (DAA dependent) of the receive level at the
MDP, not at the telephone line connector. For example, 009 = -9 dBm, 043
= -43 dBm, and so on.
Result Codes:
OK
Command: %Q
Description:
Report Line Signal Quality
Reports the line signal quality (DAA dependent). Returns the higher order
byte of the EQM value. Based on the EQM value, retrain or fallback/fall
forward may be initiated if enabled by %E1 or %E2.
Example:
AT%Q
015
Result Codes:
OK
If connected.
ERROR
If not connected, or connected in 300 bps, V.23, or fax modes.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: –STE= Set Telephony Extension
Description:
Enables/disables Line-In-Use, Extension Pickup, and Remote Hangup
detection features.
Note: Additional hardware may be required to support these features.
The <value> corresponds to the selected bit-mapped options. The bit fields
are defined as follows:
Defined Values:
Bit 0
Bit 1
Bit 2
Line-In-Use detection enable/disable.
Extension Pickup detection enable/disable.
Remote Hangup detection enable/disable.
<value>
(Dec.)
Remote
Hangup
Extension
Pickup
Line-in-Use
0 (default) Disabled
Disabled
Disabled
Enabled
Enabled
Disabled
Disabled
Enabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
Disabled
Enabled
1
2
3
4
5
6
7
Disabled
Disabled
Disabled
Enabled
Enabled
Enabled
Enabled
Report Commands:
-STE? Reports current values
Example: -STE: 4 Remote Hangup enabled, Extension
Pickup disabled, and Line-In-Use disabled.
-STE=? Reports available options
Behavior in Data Mode (+FCLASS=0):
When on-hook, if the line is in use and an ATDT is issued, the modem will
not go off-hook and will return with the message LINE-IN-USE.
When off-hook and either an extension is picked up or a line reversal is
detected, the modem will drop the connection. The disconnect reason in
register S86=25 (this is also defined for #UD). The user must flash the
hook in order to get a dial tone due because the remote server will be
retraining.
If the local handset is picked up while the modem is off-hook, the modem
will do a link-disconnect, flash the hook for 1.5 seconds, and then connect
the local handset to the line. At this point, the user dial tone should be on
the local handset. The disconnect reason in S86=25.
Behavior in Voice Mode (+FCLASS=8):
When in voice mode and an extension is picked-up, a <DLE>P is sent to
the DTE. When the modem is off-hook, a line reversal may also be
detected in which case a <DLE>l is sent to the DTE.
In voice mode, there is no blocking of ATDT when the line is in use. Also,
there is no automatic hang-up in voice mode as in data mode. There is
only the above stated <DLE> shielding event reporting.
Operation in Data Mode:
Line-In-Use
(Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7)
Case 1: Telephone Line is in Use
If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is
enabled and the telephone line is in use, the modem will immediately
return the message LINE-IN-USE to the DTE without going off-hook, and
then return to command mode.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Case 2: Telephone Line is in Use but Disconnected
If an ATDT, ATDP or ATDL is issued while Line-In-Use detection is
enabled and the telephone line is NOT in use, the modem will go off-
hook after a short pause, then respond with CONNECT or NO CARRIER
message.
Case 3: Telephone Line is not Connected to Modem
If an ATDT, ATDP, or ATDL is issued while Line-In-Use detection is
enabled and the telephone line is not connected, the modem will go off-
hook momentarily, go back on-hook, and then respond with NO DIAL
TONE message.
Extension Pick-up
(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7):
Case 1: Modem off-hook, Local Handset Goes Off-Hook
If the local handset goes off-hook while the modem is in a data
connection, the local handset will be muted. The modem will then send a
GSTN Cleardown to the remote modem and then go on-hook. The
modem will then send a NO CARRIER message to the DTE. A result
code of 25 will be left in S86 register. After 2 seconds, the local handset
will be connected to the telephone line so the user hears the dial tone.
Remote Hang-up
(Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7):
Case 1: Modem off-hook, Remote Hang-up
If the modem is connected (off-hook) and the remote modem/server
goes hangs up, the central office may issue a line polarity reversal. If a
line polarity reversal is detected, the modem will drop the call and
respond with NO CARRIER. The reason for hang-up can be determined
by #UD or by S86=25. A line reversal can also be simulated by simply
pulling out the telephone line during a connection.
Operation in Voice Mode
Line-In-Use
(Enabled by AT-STE=1, AT-STE=3, AT-STE=5, or AT-STE=7):
This feature does not apply in voice mode.
Extension Pickup
(Enabled by AT-STE=2, AT-STE=3, AT-STE=6, or AT-STE=7)
If the modem is off-hook and an extension goes off-hook, the modem
issues a <DLE>P to the DTE. The application software should then hang
up the line (VLS=0).
Remote Hang-up (Enabled by AT-STE=4, AT-STE=5, AT-STE=6, or AT-STE=7)
If the modem is off-hook and the remote user goes on-hook, the modem
issues a <DLE>P to the DTE. The application software should then hang
up the line (VLS=0).
Examples:
User is talking on an extension and the modem tries to dial
AT-STE=7
ATDT555-1212
LINE-IN-USE.
The line is not in use and the modem tries to dial
AT-STE=7
ATDT555-1212
Modem goes off-hook
CONNECT
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Chapter 5 – AT Commands, S-Registers, and Result Codes
An extension is off-hook but there is silence on the line and the modem
tries to dial
AT-STE=3
ATDT555-1212
Modem goes off-hook
NO DIAL TONE
Modem is connected in data mode and remote modem goes on-hook
AT-STE=4
ATDT555-1212
CONNECT
NO CARRIER
ATS86=?
025
Remote modem drops line
Modem is in answer machine mode and an extension goes off-hook
AT-STE=2
AT+FCLASS=8
OK
<DLE>h
<DLE>R
Local handset on-hook
Ring
AT+VLS=1
OK
AT+VSM=1,7200,0,0
AT+VTX
<DLE>P
<DLE>!
AT+VLS=0
Starts to play greeting message
User picks up extension
DTE send abort to end playback
DTE hangs up.
Automated system that needs to periodically use the line while giving the
voice user the highest priority
A common use for these features would be an automated system that
needs to periodically use the line while giving the voice user the highest
priority. The automated system would make a connection when the line is
free. It would do this without disturbing the line if the line is in use. The
automated system would periodically retry the connection until the line is
free. Once the line is free it would dial and make its connection. If a voice
user wishes to use the line while the modem is connected. The modem will
drop the line and give the line to the user. The modem will then try to
regain control of the line by once again periodically retrying to establish a
connection.
AT-STE=7
OK
ATDT5551212
CONNECT
Sometime later, the user picks up phone
NO CARRIER
ATS86?
25
OK
Delay 30 seconds
ATDT5551212
LINE-IN-USE
Try again some time later; user hangs up phone
CONNECT
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Modulation Control Commands
Command: +MS
Description:
Modulation Selection
This extended-format compound parameter controls the manner of
operation of the modulation capabilities in the modem. It accepts six
subparameters.
Syntax:
+MS=[<carrier>[,<automode>[,<min_tx_rate>[,<max_tx_rate>
[,<min_rx_rate> [,<max_rx_rate>]]]]]]
Where possible <carrier>, <min_tx_rate>, <max_tx_rate>, <min_rx_rate>,
and <max_rx_rate> values are listed in Table 5-3.
Table 5-3. +MS Command Supported Rates
Modulation <carrier> Possible (<min_rx_rate>, <min_rx_rate>, (<min_tx_rate>),
and <max_tx_rate>) Rates (bps)
Bell 103
Bell 212
V.21
B103
B212
V21
300
1200 Rx/75 Tx or 75 Rx/1200 Tx
300
V.22
V22
1200
V.22 bis
V.23
V.32
V22B
V23C
V32
2400 or 1200
1200
9600 or 4800
V.32 bis
V.34
V32B
V34
14400, 12000, 9600, 7200, or 4800
33600, 31200, 28800, 26400, 24000, 21600, 19200, 16800,
14400, 12000, 9600, 7200, 4800, or 2400
56000, 54000, 52000, 50000, 48000, 46000, 44000, 42000,
40000, 38000, 36000, 34000, 32000
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
56000, 54667, 53333, 52000, 50667, 49333, 48000, 46667,
45333, 44000, 42667, 41333, 40000, 38667, 37333, 36000,
34667, 33333, 32000, 30667, 29333, 28000
48000, 46667, 45333, 44000, 42667, 41333, 40000, 38667,
37333, 36000, 34667, 33333, 32000, 30667, 29333, 28000,
26667, 25333, 24000
56K
K56
V90
V.90
V.92
downstream
V92
V92
V.92
upstream
Note: Some <carrier> values may not be supported by certain model models. For
example, modem models supporting V92 may not support K56.
Defined Values:
<carrier>
A string that specifies the preferred modem carrier to
use in originating or answering a connection. <carrier>
values are strings of up to eight characters, consisting
only of numeric digits and upper case letters. <carrier>
values for ITU standard modulations take the form:
<letter><1-4 digits><other letters as needed>. Defined
values are listed in Table 5-3.
<automode>
A numeric value which enables or disables automatic
modulation negotiation (ITU-T V.32bis Annex A or V.8).
0 = Automode disabled.
1 = Automode enabled. (Default.)
<min_rx_rate> and <max_rx_rate>
Numeric values which specify the lowest
(<min_rx_rate>) and highest (<max_rx_rate>) rate at
which the modem may establish a receive connection.
May be used to condition distinct limits for the receive
direction as distinct from the transmit direction. Values
for this subparameter are decimal encoded, in units of
bit/s. The possible values for each modulation are listed
in Table 5-3. Actual values will be limited to possible
values corresponding to the entered <carrier> and fall-
back <carrier> as determined during operation. (Default
= lowest (<min_rx_rate>) and highest (<max_rx_rate>)
rate supported by the selected carrier.)
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<min_tx_rate> and <max_tx_rate>
Numeric values which specify the lowest
(<min_tx_rate>) and highest (<max_tx_rate>) rate at
which the modem may establish a transmit connection.
Non-zero values for this subparameter are decimal
encoded, in units of bit/s. The possible values for each
modulation are listed in Table 5-3.
Actual values will be limited to possible values
corresponding to the entered <carrier> and fall-back
<carrier> as determined during operation. (Default =
lowest (<min_tx_rate>) and highest (<max_tx_rate>)
rate supported by the selected carrier.).
Report Commands:
+MS?
Reports current rates
Response: +MS:<carrier>,<automode>,<min_tx_rate>,
<max_tx_rate>, <min_rx_rate>,<max_rx_rate>
Note: The current active settings are reported under control of
the +MR parameter.
Example: +MS: K56, 1,300,33600,300,56000
For default values. This example allows maximum system
flexibility to determine optimal receive and transmit rates
during operation.
+MS=?
Reports supported range of parameter values:
Response: +MS: (< carrier> range),(<automode>
range),(<min_tx_rate> range), (<max_tx_rate> range),
(<min_rx_rate> range), (<max_rx_rate> range)
Example 1:
+MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,
K56,V90),(0,1),(300-33600),(300-33600),(300-56000),(300-
56000)
Example 2:
+MS:(B103,B212,V21,V22,V22B,V23C,V32,V32B,V34,
V90,V92),(0,1),(300-33600),(300-33600),(300-56000),(300-
56000)
Result Code:
OK - Valid subparameter string
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: +MR
Description:
Modulation Reporting Control
This extended-format numeric parameter controls whether or not the
extended-format +MCR:<carrier> and +MRR:<rate> intermediate result
codes are transmitted from the modem to the DTE. If enabled,
+MCR:<carrier> and +MRR:<rate> intermediate result codes represent the
current (negotiated or renegotiated) modulation <carrier> and <rate> that
are transmitted at the point during connect negotiation (handshaking) at
which the modem has determined which modulation and rate will be used,
i.e., before any Error Control or Data Compression reports are transmitted,
and before any final result code (e.g., CONNECT) is transmitted.
S95 bit 2 is reset to 0 for +MR=0 and is set to a 1 for +MR=1 or +MR=2.
The more recent setting of +MR or S95 bit 2, and the W command setting,
determines modulation result code reporting (see S95 Parameter and W
Command).
Default:
0
Defined Values:
+MR0 Disables reporting of modulation connection (+MCR: and +MRR:
are not transmitted).
+MR1 Enables reporting of modulation connection (+MCR: and +MRR:
are transmitted with TX rate, RX rate).
+MR2 Enables reporting of modulation connection (+MCR: and +MRR:
are transmitted with RX rate only).
Report Commands:
+MR? Reports the current value.
+MR=? Reports supported range of parameter values:
Command: %E
Enable/Disable Line Quality Monitor and Auto-Retrain or
Fallback/Fall Forward
Controls whether or not the modem will automatically monitor the line
quality and request a retrain (%E1) or fall back when line quality is
insufficient or fall forward when line quality is sufficient (%E2). The
parameter value, if valid, is written to S41 bits 2 and 6.
If enabled, the modem attempts to retrain for a maximum of 30 seconds.
Description:
Fallback/Fall Forward. When %E2 is active, the modem monitors the line
quality (EQM). When line quality is insufficient, the modem will initiate a
rate renegotiation to a lower speed within the V.34/V.32 bis/V.32 (RC336)
modulation speeds. The modem will keep falling back within the current
modulation if necessary until the speed reaches 2400 bps (V.34) or 4800
bps (V.32). Below this rate, the modem will only do retrains if EQM
thresholds are exceeded. If the EQM is sufficient for at least one minute,
the modem will initiate a rate renegotiation to a higher speed within the
current modulation speeds. The rate renegotiations will be done without a
retrain if a V.32bis connection is established.
Speeds attempted during fallback/fall forward are those shown to be
available in the rate sequences exchanged during the initial connection.
Fallback/fall forward is available in error correction and normal modes, but
not in direct mode or synchronous mode with external clocks.
2
Default:
Defined Values:
%E0 Disable line quality monitor and auto-retrain.
%E1 Enable line quality monitor and auto-retrain.
%E2 Enable line quality monitor and fallback/fall forward. (Default.)
OK
Result Codes:
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: %U
Select µ-Law or A-Law Codec Type
Description:
Selects µ-Law or A-Law codec type for V.90 and 56K modulation.
This command also stores the selected setting directly to NVRAM.
Default value is country specific
Default:
Defined Values:
0
Selects µ-Law.
1
Selects A-Law.
Result Codes:
OK
Otherwise ERROR
Command:
B
CCITT or Bell
Description:
When the modem is configured to allow either option, the modem will
select Bell or CCITT modulation for a line speed connection of 300 or 1200
bps. Any other line speed will use a CCITT modulation standard. The
parameter value, if valid, is written to S27 bit 6.
0
Default:
Defined Values:
B0 Selects CCITT operation at 300 or 1200 bps during Call
Establishment and a subsequent connection. (Default.)
B1 Selects BELL operation at 300 or 1200 bps during Call
Establishment and a subsequent connection.
OK
Result Codes:
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Error Control Commands
Command: +ES
Description:
Error Control and Synchronous Mode Selection
This extended-format command specifies the initial requested mode of
operation when the modem is operating as the originator. Optionally
specifies the acceptable fallback mode of operation when the modem is
operating as the originator, and optionally specifies the acceptable fallback
mode of operation when the modem is operating as the answerer. Accepts
three numeric subparameters.
Default:
Varies by request
Defined Values:
<orig_rqst>
Decimal number specifies the initial requested mode of operation when the
modem is operating as the originator. The options are:
+ES0 Initiate call with Direct Mode.
+ES1 Initiate call with Normal Mode (also referred to as Buffered Mode)
only.
+ES2 Initiate V.42 without Detection Phase. If V.8 is in use, disable V.42
Detection Phase.
+ES3 Initiate V.42 with Detection Phase. (Default.)
+ES4 Initiate MNP.
+ES6 Initiate V.80 Synchronous Access Mode when connection is
completed, and Data State is entered. (See +ESA and +ITF
commands.)
+ES7 Initiate Frame Tunneling Mode when connection is complete, and
Data Mode is entered.
<orig_fbk>
Decimal number specifies the acceptable fallback mode of operation when
the modem is operating as the originator.
+ES0 LAPM, MNP, or Normal Mode error control optional. (Default.)
+ES1 LAPM, MNP, or Direct Mode error control optional.
+ES2 LAPM or MNP error control required; disconnect if error control is
not established.
+ES3 LAPM error control required; disconnect if error control is not
established.
+ES4 MNP error control required; disconnect if error control is not
established.
<ans_fbk>
Decimal number specifies the acceptable fallback mode of operation when
the modem is operating as the answerer or specifies V.80 Synchronous
Access Mode.
+ES0 Direct Mode.
+ES1 Error control disabled, use Normal Mode.
+ES2 LAPM, MNP, or Normal Mode error control optional. (Default.)
+ES3 LAPM, MNP, or Direct Mode error control optional.
+ES4 LAPM or MNP error control required; disconnect if error control is
not established.
+ES5 LAPM error control required; disconnect if error control is not
established.
+ES6 MNP error control required; disconnect if error control is not
established.
+ES8 Initiate V.80 Synchronous Access Mode when connection is
completed and Data State is entered (see +ESA and +ITF).
+ES9 Initiate Frame Tunneling Mode when connection is complete, and
Data Mode is entered.
Examples:
+ES=6
+ES=6
+ES=,,8
Enable V.80 Synchronous Access Mode originator.
Enable V.80 Synchronous Access Mode originator.
Enable V.80 Synchronous Access Mode answerer.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
+ES=6,,8 Enable V.80 Synchronous Access Mode.
+ES=3
Enable V.42 with Detection Phase originator. Disable V.80
Synchronous Access Mode originator.
+ES=,,2
Allow LAPM, MNP, or Normal Mode connection answerer.
Disable V.80 Synchronous Access Mode answerer.
+ES=3,,2 Enable V.42 with Detection Phase originator, allow LAPM,
MNP, or Normal Mode connection answer. Disable
Synchronous Access Mode originator and answerer.
Report Commands:
+ES?
Reports the current values
Response: +ES: <orig_rqst>,<orig_fbk>,<ans_fbk>
Example: +ES: 3,0,2 For the default setting.
Reports supported range of parameter values
Response: +ES: (<orig_rqst> range),( <orig_fbk> range),
(<ans_fbk> range)
+ES=?
Example: +ES: (0-4,6,7),(0-4),(0-6,8,9)
Command: +EB
Break Handling in Error Control Operation
This extended-format compound parameter controls the break handling in
V.42 operation. It accepts three numeric subparameters:
None
Description:
Default:
Defined Values:
<break_selection>
Decimal number 0 specifying that break is to be
ignored, i.e., not signaled to remote DCE.
<timed>
Decimal number 0 specifying that any transmitted
V.42 L-SIGNAL will not indicate break signal length
<default_length> Decimal number 0 specifying that
break is not delivered to the DTE.
Report Commands:
+EB?
Reports current or selected values
Response: +EB:
<break_selection>,<timed>,<default_length><CR>
Example: +EB: 0,0,0 For default settings.
+EB=?
Reports supported range of parameter values
Response: +EB: (<break_selection> range),(<timed> range),
(default_length> range)
Example: +EB: (0),(0),(0)
Command: +ESR
Description:
Selective Repeat
This extended-format numeric parameter controls the use of the selective
repeat (SREJ) option in V.42.
Decimal number 0 specifying that SREJ is not used.
Report Commands:
+ESR?
Reports Current or Selected Values:
Response: +ESR: <value>
Example: +ESR: 0 For default setting
Reports Supported Range of Parameter Values
Response: +ESR: (<value>)
+ESR=?
Example: +ESR: (0)
Command: +EFCS
32-bit Frame Check Sequence
Description:
This extended-format numeric parameter controls the use of the 16-bit or
32-bit frame check sequence (FCS) option in V.42.
<value> Decimal number 0 specifying the use of the 16-bit FCS specified
in V.42.
Defined Values:
Report Commands:
+EFCS?
Current or Selected Values:
Response: +EFCS: <value>
Example: +EFCS: 0 For default setting.
+EFCS=? Reporting Supported Range of Parameter Values
Response: +EFCS: (<value> range)
Example: +EFCS: (0)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: +ER
Error Control Reporting
Description:
This extended-format numeric parameter controls whether or not the
intermediate result code is transmitted from the modem to the DTE.
S95 bit 3 is reset to 0 for +ER=0 and is set to a 1 for +ER=1. The more
recent setting of +ER or S95 bit 3, and the W command setting, determines
the actual error control result code reporting (see S95 Parameter and W).
0
Default:
Defined Values:
+ER0
+ER1
+ER?
Error control reporting disabled (no +ER intermediate result
code transmitted).
Error control reporting enabled (+ER intermediate result code
transmitted).
Reports Current or Selected Values
Response: +ER: <current value>
Report Commands:
Example: +ER: 0 for the default setting
Reporting Supported Range of Parameter Values.
Response: +ER: (<value> range)
Example: +ER: (0,1)
+ER=?
Command: +ER: <type> Report the Current Error Control
Description:
The +ER: <type> reported represents the current (negotiated or
renegotiated) modem-modem error control type. If enabled, the
intermediate result code is transmitted during error control negotiation
(handshaking) at which time the modem has determined the error control
protocol will be used (if any), before the final result code (e.g.,
CONNECT) is transmitted. The +ER intermediate result code, if enabled,
is issued after the Modulation report (+MCR and +MRR) and before the
Data Compression Report (+DR).
Defined Values:
NONE
LAPM
ALT
Error control is not in use.
V.42 LAPM protocol is in use.
MNP is in use.
Example: +ER: LAPM
Command: +ETBM
Description:
Call Termination Buffer Management
This extended-format compound parameter controls the handling of data
remaining in modem buffers upon call termination. It accepts three numeric
subparameters:
None
Default:
Defined Values:
<pending_TD>
Decimal number 0 specifies disconnect will occur
immediately and all buffered transmit data will be
discarded when the local DTE requests call
disconnection.
<pending_RD> Decimal number 0 specifying that disconnect will occur
immediately and all buffered receive data will be
discarded when the local DTE requests call
disconnection.
<timer>
Decimal number 0 specifying that the modem will not
attempt to deliver the buffered data before abandoning
the attempt and discarding remaining data.
Reports Current or Selected Values.
Response:
Report Commands:
+ETBM?
+ETBM: <pending_TD>,<pending_RD>,<timer>
Example: +ETBM: 0,0,0
+ETBM=?
Reports Supported Range of Parameter Values.
Response:
+ETBM: (<pending_TD> range),(<pending_RD> range),
(<timer> range)
Example: +ETBM: (0),(0),(0)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: \B
Description:
Transmit Break to Remote
In non-error correction mode, the modem will transmit a break signal to the
remote modem with a length in multiples of 100 ms according to parameter
specified. If a number in excess of 9 is entered, 9 is used. The command
works in conjunction with the \K command.
In error correction mode, the modem will signal a break through the active
error correction protocol, giving no indication of the length.
1-9 Break length in 100 ms units. (Default = 3.)
(Non-error corrected mode only.)
OK if connected in data modem mode.
Defined Values:
Result Codes:
NO CARRIER if not connected or connected in fax modem mode.
Note: When the modem receives a break from the remote modem, break is
passed to the DTE as follows: In non-error correction mode direct, the
break length is passed; in non-error correction mode normal and in error
correction mode, a 300 ms break is passed.
Command: \K
Description:
Break Control
Controls the response of the modem to a break received from the DTE or
the remote modem or the \B command. The parameter value, if valid, is
written to S40 bits 3, 4, and 5.
Defined Values:
The response is different in three separate states.
The first state is where the modem receives a break from the DTE
when the modem is operating in data transfer mode:
0 Enter on-line command mode, no break sent to the remote modem.
1 Clear data buffers and send break to remote modem.
2 Same as 0.
3 Send break to remote modem immediately.
4 Same as 0.
5 Send break to remote modem in sequence with transmitted data.
(Default.)
The second case is where the modem is in the online Command State
(waiting for AT commands) during a data connection, and the \B is
received in order to send a break to the remote modem:
0 Clear data buffers and send break to remote modem.
1 Clear data buffers and send break to remote modem. (Same as 0.)
2 Send break to remote modem immediately.
3 Send break to remote modem immediately. (Same as 2.)
4 Send break to remote modem in sequence with data.
5 Send break to remote modem in sequence with data. (Same as 4.)
(Default.)
The third case is where a break is received from a remote modem
during a non-error-corrected connection:
0 Clears data buffers and sends break to the DTE.
1 Clears data buffers and sends break to the DTE. (Same as 0.)
2 Send a break immediately to DTE.
3 Send a break immediately to DTE. (Same as 2.)
4 Send a break in sequence with received data to DTE.
5 Send a break in sequence with received data to DTE. (Same as 4.)
(Default.)
Result Codes:
OK
Otherwise ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: -K
MNP Extended Services
Description:
Enables or disables conversion of a V.42 LAPM connection to an MNP 10
connection. The parameter value, if valid, is written to S40 bits 0 and 1.
-K0 Disables V.42 LAPM to MNP 10 conversion. (Default.)
-K1 Enables V.42 LAPM to MNP 10 conversion.
-K2 Enables V.42 LAPM to MNP 10 conversion; inhibits MNP Extended
Services initiation during V.42 LAPM answer mode detection phase.
OK
Defined Values:
Result Codes:
ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Data Compression Commands
This section contains parameters to condition modem use of standard ITU-T V.42bis Data Compression
Procedures.
Command: +DS
Description:
Data Compression
This extended-format compound parameter controls the V.42bis data
compression function if provided in the modem. It accepts four numeric
subparameters:
Defined Values:
<direction> Specifies the desired direction(s) of operation of the data
compression function; from the DTE point of view.
+DS0 Negotiated; no compression (V.42bis P0=0).
+DS3 both directions, accept any direction (V.42bis
P0=11). (Default.)
<compr_neg>
Specifies whether or not the modem should continue to
operate if the desired result is not obtained.
+DS0 Do not disconnect if V.42bis is not negotiated by
the remote modem as specified in <direction>.
Specifies the maximum number of dictionary entries
(2048 entries) which should be negotiated (may be used
by the DTE to limit the code word size transmitted,
based on its knowledge of the nature of the data to be
transmitted).
<max_dict>
<max_string>
Specifies the maximum string length (32 bytes) to be
negotiated (V.42bis P2).
Report Commands:
+DS?
Reports Current or Selected Values.
Response: +DS:
<direction>,<compr_neg>,<max_dict>,<max_string>
Example: +DS:
3,0,2048,32 for the defaults and 2048 entry max dictionary.
Reports Supported Range of Parameter Values.
Response: +DS:
+DS=?
(<direction> range),(< compr_neg > range),
(<max_dict> range),(<max_string> range)
Example: +DS: (0,3),(0),(2048),(32)
Command: +DS44
Description:
V.44 Compression Select
This extended-format compound parameter controls the V.44 data
compression function.
Defined Values:
<direction> Decimal number that specifies the desired direction(s) of
operation of the data compression function; from the DTE point of view.
+DS440
+DS441
+DS442
+DS443
Negotiated, no compression.
Transmit only.
Receive only.
Both directions, accept any direction. (Default.)
<compress_negotiation> Decimal number that specifies whether or not
the modem should continue to operate if the desired result is not obtained.
+DS440
Do not disconnect if V.44 is not negotiated by the remote
DCE as specified in <direction>. (Default.)
Disconnect if V.44 is not negotiated by the remote DCE
as specified in <direction>.
+DS441
<capability> Decimal number that specifies the use of stream method,
packet method, multi-packet method.
+DS440
+DS441
+DS442
Stream method. (Default.)
Packet method.
Multi-packet method.
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<max_codewords_tx> Decimal number 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the transmit
direction. (Default = 2048.)
<max_codewords_rx> Decimal number 256 to 2048 that specifies the
maximum number of codewords which should be negotiated in the receive
direction. (Default = 2048.)
<max_string_tx> Decimal number 32 to 255 that specifies the maximum
string length to be negotiated in the transmit direction. (Default = 32.)
<max_string_rx> Decimal number 32 to 255 that specifies the maximum
string length to be negotiated in the receive direction. (Default = 32.)
<max_history_tx> Decimal number 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the transmit
direction. (Default = 4096.)
<max_history_rx> Decimal number 2048 to 4096 that specifies the
maximum size of the history buffer to be negotiated in the receive direction.
(Default = 4096.)
Report Commands:
+DS44? Reports Current or Selected Values.
Response:
+DS44:<direction>,<compression_negotiation>,<capability>,
<max_codewords_tx>,<max_codewords_rx>,<max_string_tx>,
<max_string_rx>,<max_history_tx>,<max_history_rx>
Example: +DS44:3,0,0,2048,2048,32,32,4096,4096 For the
default setting.
+DS44=? Reports Supported Range of Parameter Values.
Response: +DS44:(list of supported <direction> values),(list of
supported <compression_negotiation> values),(list of supported
<capability> values),(list of supported <max_codewords_tx>
values),(list of supported <max_codewords_rx> values),(list of
supported <max_string_tx> values),(list of supported
<max_string_rx> values),(list of supported <max_history_tx>
values),(list of supported <max_history_rx> values)
Command: +DR
Description:
Data Compression Reporting
This extended-format numeric parameter controls whether or not the
extended-format +DR: intermediate result code is transmitted from the
modem to the DTE. S95 bit 5 is reset to 0 for +DR=0 and is set to a 1 for
+DR=1. The more recent setting of +DR or S95 bit 5, and the W command
setting, determines the actual data compression result code reporting (see
S95 Parameter and W Command).
Defined Values:
+DR0 Data compression reporting disabled (no +DR result code
transmitted).
+DR1 Data compression reporting enabled (+DR result code
transmitted). (Default.)
Report Commands:
+DR? Reports Current or Selected Values.
Response: +DR: <current value>
Example: +DR: 1 For the default setting.
+DR=? Reports Supported Range of Parameter Values.
Response: +DR: (<value> range)
Example: +DR: (0,1)
Intermediate Result Code:
+DR: <type>
The +DR: <type> reported represents the current (negotiated or
renegotiated) modem-modem data compression type. If enabled, the
intermediate result code is transmitted at the point after error control
negotiation (handshaking) at which the modem has determined which data
compression technique will be used (if any) and the direction of operation.
The +DR intermediate result code, if enabled, is issued after the Error
Control Report (+ER) and before the final result code (e.g., CONNECT).
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The format of this result code is:
Defined Values:
<type>
An alphanumeric code corresponding to the selected option:
NONE Data compression is not in use.
V42B
V42B
V.42bis is in use in both directions.
RD V.42 bis is in use in receive direction only V42B TD V.42 bis
is in use in transmit direction only V44 V.44 is in use in both
directions V44 RD V.44 is in use in receive direction only V44
TD V.44 is in use in transmit direction only ALT MNP 5
compression.
Example:
+DR: V42B
Command: %C
Description:
Enable/Disable Data Compression
Enables or disables data compression negotiation. The modem can only
perform data compression on an error-corrected link. The parameter value,
if valid, is written to S41 bits 0 and 1.
Defined Values:
Result Codes:
%C0 Disables data compression. Resets S46 bit 1.
%C1 Enables MNP 5 data compression negotiation. Resets S46 bit 1.
%C2 Enables V.42 bis data compression. Sets S46 bit 1.
%C3 Enables both V.42 bis and MNP 5 data compression. Sets S46 bit
1. (Default.)
OK
ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
V.8/V.8bis Commands
Command: +A8E
Description:
V.8 and V.8bis Operation Controls
This command is defined for two conditions: as a parameter while the
modem is on-hook, and as an action command while the modem is off-
hook. If enabled, V.8 negotiation does not preclude simultaneous
implementation of other negotiation means (e.g., V.8bis, V.18, V.32bis
Annex A).
This command is a compound parameter if issued while the modem is on-
hook, used to precondition V.8 and V.8bis originating and answering
operation. It is issued by the DTE before the Dial (D) or Answer (A)
command, regardless of the state of the +FCLASS parameter.
This command is an action command if issued while the modem is off-
hook, to (re)start V.8 or V.8bis negotiation. For example, if initial V.8
negotiation failed, but subsequent T.30 negotiation indicated V.8 capability,
this command may be used to initiate V.8 negotiation.
Defined Values:
<v8o> Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 origination negotiation.
1
Enable DCE-controlled V.8 origination negotiation without
+A8x indications. (Default.)
6
Enable DCE-controlled V.8 origination negotiation with +A8x
indications.
<v8a>= Decimal number which enables/disables issuance of +A8x
indications during modem-controlled V.8 answer negotiation.
1
Enable DCE-controlled V.8 answer negotiation without +A8x
indications. (Default.)
5
Enable DCE-controlled V.8 answer negotiation with +A8x
indications.
<v8cf>= Set the V.8 CI signal call function to the hexadecimal octet XY.
00 (Default.)
21
C1
<v8b>= Decimal number which enables/disables V.8bis negotiation.
0
1
Disable V.8bis negotiation.
Enable V.8bis negotiation. (Default.)
<cfrange>= “<string of values>“. Applicable only for <v8a>=5.
Not supported.
< protrange >= “<string of values>“. Applicable only for <v8a>=5.
Not supported.
Default values:
1,1,00,1,0,0
The ATD and ATA commands behave as specified in V.250, and +A8n
indications are not generated by the modem.
For subparameter values <v8o>=6 and <v8a>=5, the +A8I indications are
issued during the course of the V.8 session to notify the DTE when the
relevant V.8 signals are received.
Report Commands:
+A8E? Reports Current or Selected Values.
Response: +A8E:
<v8o>,<v8a>,<v8cf>[,<v8b>][,<cfrange>][,<protrange>]
Example: +A8E: 1,1,00,1,0,0 For the defaults
+A8E=? Reports Supported Range of Parameter Values.
Response: +A8E: (<v8o> range),(<v8a> range),(v8cf in octets),
(<v8b> range),(<cfrange>),(<protrange>)
Example: +A8E: (1,6),(1,5),(0,21,C1),(0,1),(0),(0)
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Command: +A8I:
Description:
CI Signal Indication
This indication is issued by an answering modem, if +A8E,<v8a> .0, to
indicate detection of a V.8 CI signal, and report the recovered Call Function
octet(s).
Defined Values:
Example:
<v8cf>
A hexadecimal code octet representation of the Call Function
octet(s). +A8I:0 indicates that the modem timed out waiting for
CI.
+A8I:0
The modem timed out waiting for CI.
+A8I:X YYY
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Diagnostic Commands
Command: #UD
Description:
Last Call Status Report
#UD is an action command requesting logged operation events reporting. It
does not take parameters and must be the last command in the command
line.
The modem logs aspects of their operation for each call, and saves these
results until cleared by one of the following events:
Power off.
Hard reset (e.g., negate DTR with &D3 set; reset button).
Soft reset = ATZ or AT&F.
ATD command issued.
ATA command issued.
Automatic answer (e.g., set register S0>0 and ring detected).
These results are NOT cleared by changing DTR, V.24 circuit 108.2, if
&D0, &D1 or &D2.
Data Call State Model:
For purposes of this command, there are four data call states, and
associated status issues:
1. Call Setup
-Calling DCE: get dial tone, generate dial digits, and detect call
progress signals.
-Answering DCE: detect ringing, detect Caller ID, etc.
2. Negotiation
-V.25 calling tone/answer tone exchanges
-V.8 or V.8bis call function negotiations
-V-series modem carrier detection and training
-Modem-to-modem protocols (e.g., V.42, V.42bis).
3. Data Transfer
-Bit-error rates, for each direction
-Rate renegotiation
-Retraining
4. Call Termination
-protocol disconnect signals
-carrier disconnect signals
-loss of carrier
-excessive error rates
Command Syntax:
In response to this command, the modem will report one or more lines of
information text as defined below. Information text format conforms to
V.250; each line is preceded by a <CR><LF> pair, and terminated by
<CR><LF>. (CR and LF characters may be changed by writing new values
to the contents of registers S3 and S4, respectively.)
The modem may generate a single line or multiple lines, followed by OK
result code. For example, if call setup failed, only that result is useful. Each
information text line is formatted as follows, including one or more
key=value pairs:
Response: DIAG <token key=value [[key=value] [key=value]] …>
Defined Values: DIAG 5 hexadecimal characters (44h, 49h, 41h, 47h, 20h)
<
Left angle bracket (less than sign) (3Ch) token Unique 32-bit
hexadecimal string 2A4D3263(32h, 4h1, 34h, 44h, 33h, 32h, 36h,
33h)
space space character (20h)
Key
=
One- or two-digit hexadecimal number (see Key in Table 5-4)
Equal sign (3Dh)
Value Any string as defined below (Table 5-4 - Table 5-9 as appropriate)
>
Right angle bracket (greater than sign) (3Eh)
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Unless otherwise noted, all values are hexadecimal numbers. Any numeric
values from tables in ITU V.58 are converted to hexadecimal. Multi-digit
values are reported MSD first. Leading 0’s may be deleted. See examples
in Table 5-13.
Monitoring an Active Connection
This command is intended for use after call termination. However, codes are
defined so that a modem can respond before the first call is placed, and during a
call for live monitoring purposes. For example, key 60, call termination, has value
1 defined, indicating that the call is still in progress.
There are at least two ways to do this. First, the DTE could switch the modem to
Online command state, issue the command, capture the responses and then
issue an ATO command. For smoother online monitoring, in-band means defined
in ITU V.80 are recommended if available in the modem. If V.80 methods are
used, each response line shall be a separate extended in-band message.
Notes for Tables
1. The modem may insert a delay (e.g., 10 ms) between information text lines.
2. The code tables include values for data and fax calls. Some of the codes are
applicable only to data calls (e.g., data compression), some are applicable
only to call origination (e.g., busy, answering signal detection) and some are
applicable only to the answering modem (e.g., calling signal detection).
callCleared codes from 3.6.4/V.58-1994
callCleared: indicates that the DCE has gone on-hook and that the previously
existing network connection has been cleared. These values are hex values,
converted from decimal in V.58. callCleared codes are described in Table 5-12.
Table 5-4. AT#UD Last Call Status Report Format
Key
Value(s)
2 digits
Table 5-5
Table 5-6
Table 5-7
String
String
0-2F
0-1F
0-64
Definition
0
Diagnostic Command Specification revision number, digit.digit
Call Setup Result code
1
2
3
4
Multi-media mode
DTE-DCE interface mode
V.8 CM octet string, same format as V.250, in quotes
V.8 JM octet string, same format as V.250, in quotes
Received signal power level, in –dBm (0-43)
Transmit signal power level, in –dBm (e.g., 0-17)
Estimated noise level, in –dBm (e.g., 10-90)
Round Trip delay, in units of ms
V.34 INFO bit map
Transmit Carrier Negotiation Result
Receive Carrier Negotiation Result
Transmit Carrier symbol rate (0-8000) in symbol/s
Receive Carrier symbol rate (0-8000) in symbol/s
Transmit Carrier frequency (0-4000) in Hz
Receive Carrier frequency (0-4000) in Hz
Initial transmit carrier data rate (0-64000) in bit/s
Initial receive carrier data rate (0-64000) in bit/s
Temporary carrier loss event count
Carrier Rate re-negotiation event count
Carrier Retrains requested
Carrier Retrain requests granted
Final transmit carrier data rate in bit/s
Final receive carrier data rate in bit/s
Protocol Negotiation Result
Error Control frame size in bytes
Error control link timeouts in transmission
control link NAKs received
Compression Negotiation Result
Transmit flow control: 0=off; 1=DC1/DC3; 2=V.24 circuit 106/133
Receive flow control: 0=off; 1=DC1/DC3; 2=V.24 circuit 106/133
5
10
11
12
17
18
20
21
22
23
24
25
26
27
30
31
32
33
34
35
40
41
42
43
44
50
51
52
53
54
0-FFF
Table 5-8
Table 5-9
Table 5-9
0-1F40
0-1F40
0-FA0
0-FA0
0-FA00
0-FA00
0-FF
0-FF
0-FF
0-FF
0-FA00
0-FA00
Table 5-10
0-400
0-FF
0-FF Error
Table 5-11
0-2
0-2
0-FFFFFFFF Transmit characters sent from DTE
0-FFFFFFFF Received characters sent to DTE
0-FFFF
Transmit characters lost (data overrun errors from DTE)
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Received characters lost (data overrun errors to DTE)
0-FFFFFFFF Transmit I- Frame count, if error control protocol running
0-FFFFFFFF Received I-Frame count, if error control protocol running
55
56
57
58
59
60
61
0-FFFF
0-FFFF
0-FFFF
Table 5-12
0-FF Call
Transmit I-Frame error count, if error control protocol running
Received I- Frame error count, if error control protocol running
Termination Cause
Waiting event count
Table 5-5. Call Setup Result Codes
Code
Definition
0
1
2
3
4
5
No previous call (modem log has been cleared since any previous calls)
No dial tone detected
Reorder signal detected, network busy
Busy signal detected
No recognized signal detected (e.g., no signal, or nothing recognizable)
Voice detected * if this is a voice modem (e.g., V.253) operating in voice mode (e.g.,
+FCLASS=8.0)
7
8
9
A
B
Data Answering signal detected (e.g., V.25 ANS, V.8 ANSam)
Data Calling signal detected (e.g., V.25 CT, V.8 CI)
Fax Answering signal detected (e.g., T.30 CED, DIS)
Fax Calling signal detected (e.g., T.30 CNG)
V.8bis signal detected
Table 5-6. Multimedia Modes
Code
Definition
0
1
2
9
A
Data Only
Fax Only
Voice
Video-telephony, H.324
Other V.80 call
Table 5-7. DTE-DCE modes
Code
Definition
0
1
2
Async data
V.80 transparent synchronous mode
V.80 framed synchronous mode
Table 5-8. V.34 INFO bit report
Bits Source bits Definition
31-30
20-29
16-19
INFO0 bit 20; 0
INFOc bits 79-88
INFOc bits 26-29 or 35-38 or 44- 47 or 53-56- or 62-65 or 71-74
Pre-emphasis field, selected by the symbol rate chosen
12-15
10-11
0-9
INFOa bits 26-29
MP bit 50; 0
INFOa bits 40-49
Table 5-9. gstnModulationSchemeActive from 3.7.2/V.58
Value
0
Description
V.17 (G3 Fax call)
1
2
V.21
V.22
3
V.22bis
4
8
9
A
B
C
E
81
84
85
V.23 Constant Carrier (1200/75)
V.27ter (G3 Fax call)
V.29 HD (G3 Fax call)
V.32
V.32bis
V.34
V.90 and V.92
56K
Bell 212A
Bell 103
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Table 5-10. errorControl Active from 3.5.2/V.58
Value
Description
Disable/none
V.42 LAPM
0
1
2
80
V.42 Alternative protocol (MNP™)
MNP10™
Table 5-11. compressionActive from 3.2.2/V.58
Value
0
Description
None
1
80
V.42bis and V.44
MNP5™
Table 5-12. callCleared codes from 3.6.4/V.58-1994
Value
Description
CauseUnidentified
No Previous call
Notes
0
Call setup issues
1
Not in V.58
2
3
4
Call is still in progress
Call Waiting signal detected
Delayed
Not in V.58
Not in V.58, only if modem can detect it
Same as value 2A, CallAttemptsLimitExceeded
19
1F
20
29
2A
2B
2C
2D
2E
2F
31
33
34
3C
3D
3E
3F
40
41
42
46
50
51
52
5A
5B
5C
5D
5E
5F
60
64
InactivityTimerExpired
cct108isOffInhibitsDial
cct108turnedOff
BlacklistedNumber
CallAttemptsLimitExceeded
ExtensionPhoneOff-hook
CallSetupFailTimerExpired
IncomingCallDetected
LoopCurrentInterrupted
NoDial tone
ReorderTone
EngagedTone
LongSpaceDisconnect
CarrierLost
TrainingFailed
NoModulationinCommon
RetrainFailed
RetrainAttemptCountExceeded
GstnCleardownReceived
FaxDetected
InTestMode
AnyKeyAbort
DteHangupCommand
DteResetCommand
FrameReject
DTR low
DTR drop
Same as “Delayed”, see ETS 300 001
If extension detection supported
e.g., S7 timeout
If incoming call while sending dial command.
Fast busy
Busy
And if modem program to abort on long space
Signal Converter
If this was not a fax call attempt
Test
Call Control
If ATH was used to terminate the previous call.
If ATZ was used to terminate the previous call.
Error Control
NoErrorControlEstablished
ProtocolViolation
n400exceeded LAPM retransmission Count Timer
NegotiationFailed
DisconnectFrameReceived
SabmeFrameReceived
Error control was required
LossOfSynchronization
Data Compression
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Example Modem Response and Usage
Example #UD commend response are shown in Table 5-13.
Table 5-13. Completed Data Call, with some errors and rate retrain during the call
Modem Response Line
DIAG <2A4D3263 0=09>
Description
This is version 0.9
DIAG <2A4D3263 1=06 2=0 3=0>
Data Answer signal detected; Data only;
Character async
DIAG <2A4D3263 5=”C14513902A” 6=”A145”>
DIAG <2A4D3263 10=1F 11=0C 12=52>
V.8 Call Menu indicates:
V.8 Joint Menu selects:
Receive level = -31 dBm; transmit level = -12
dBm; noise level = -82 dBm
Far end echo delay in milliseconds; Far end
echo loss in dB; Near end echo loss = 16 dB
Transmitter: V.34 training completed;
V.34 carrier frequency = 1920; V.34
symbol rate = 3200; initial transmit rate is
31200 bit/s
DIAG <2A4D3263 14=03 15=05 16=10>
DIAG <2A4D3263 20=C 22=780 24=0C80 26=79E0>
DIAG <2A4D3263 21=D 25=1F40 27=DAC0>
DIAG <2A4D3263 30=00 31=03 32=01 33=01>
Receiver: V.90 training completed; V.90
symbol rate = 8000; initial receive rate is
56000 bit/s
No carrier loss events, 3 carrier rate
renegotiations attempted; 1 carrier
retrain requested; 1 carrier retrain
granted
DIAG <2A4D3263 34=7080 35=CB20>
DIAG <2A4D3263 40=1 41=100>
Final transmit rate is 28800 bit/s; final
receive rate is 52000 bit/s
LAPM negotiation completed; frame size =
256
DIAG <2A4D3263 42=0 43=0>
DIAG <2A4D3263 44=1 45=400>
No error control timeout or link NAKs
V.42bis data compression used;
dictionary size = 1024
DIAG <2A4D3263 50=2 51=2>
DIAG <2A4D3263 52=343CC 54=0>
Hardware transmit and receive flow control
213964 DTE characters transmitted, w/o
underrun
DIAG <2A4D3263 53=7230E6 55=47>
DIAG <2A4D3263 56=29D 58=0001>
DIAG <2A4D3263 58=2A4B 59=0004>
DIAG <2A4D3263 60=51>
7483622 DTE characters received, 71
characters lost due to receive data overrun
597 (decimal) frames transmitted, with 1
frame error
10827 (decimal) frames received, with 4
frame errors
Local PC initiated hangup
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Compatibility Commands
Command: &L
Leased Line Operation
Description:
Requests leased line or dial-up operation. This command is provided for
compatibility only; no mode change is performed, dial-up operation
continues. The OK response is returned for a valid parameter, but no other
action is performed. The parameter value, if valid, is written to S27 bit 2.
&L0 Requests dial-up operation. Dial-up operation continues.
OK
Defined Values:
Result Codes:
ERROR
Command: )M
Description:
Enable Cellular Power Level Adjustment
This command is included for compatibility only and has no effect other
than returning a result code.
Defined Values:
Result Codes:
)M0
)M1
)M2
OK
ERROR
Command: @M
Description:
Initial Cellular Power Level Setting
This command is included for compatibility only and has no effect other than
returning a result code.
Defined Values:
Result Codes:
@M0
@M30
OK.
ERROR
Command: :E
Description:
Compromise Equalizer Enable Command
This command is included for compatibility only and has no effect other than
returning a result code.
Defined Values:
Result Codes:
:E0
:E1
OK
ERROR
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Chapter 5 – AT Commands, S-Registers, and Result Codes
FastConnect Commands
Command: $F
Description:
FastConnect Control
Allows configuring of the client modem to connect to a central site modem
that supports non-standard V.22 and V.22 bis FastConnect protocols.
Specifies the initial requested mode of operation when the modem is
operating as the originator. The options are:
Defined Values:
$F0
$F1
$F2
$F3
Normal connection (Default)
FastConnect without answer tone
Reserved
FastConnect with answer tone
V.92 +P and –Q Commands
This section describes the +P (PCM DCE) and –Q commands and parameters used to control the V.92
Mode operation.
Command: +PCW
Description:
Call Waiting Enable
Controls the operation of the modem in the presence of call waiting.
Defined Values:
+PCW0
Request modem-on-hold if enabled by +PMH and collect caller
ID information if enabled by +VRID. Toggle V.24 circuit 125.
(Default.)
+PCW1
+PCW2
OK
Hang-up.
Ignore call waiting.
Result Codes:
ERROR
+PCW?
Report Commands:
Reports Selected Value(s).
Response: +PCW: <value>
Example: +PCW: 0 For the default setting.
+PCW=? Reports Supported Range of Parameter Values
Response: +PCW: (<value> range)
Example: +PCW: (0,1,2)
Command: +PMH
Description:
Modem-on-Hold Enable
Controls the selection of modem-on-hold in the modem. The action of the
modem in response to modem-on-hold events is determined by the state of
this command as well as the state of a negotiated handshake with a V.92-
compliant server in V.92 Mode.
Defined Values:
Result Codes:
+PMH0
+PMH1
Modem-on-hold enabled in V.92 Mode. (Default.)
Disabled modem-on-hold.
OK 0 or 1 in V.92 Mode (see the +MS command)
ERROR
Report Commands:
+PMH?
Reports Current or Selected Value.
Response: +PMH: <current value>
Example: +PMH: 0 For the default setting.
+PMH=? Reports Supported Range of Parameter Values.
Response: +PMH: (<value> range)
Example: +PMH: (0,1)
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Command: +PMHR Initiate Modem-on-Hold
Description:
Requests the modem to initiate or to confirm a modem-on-hold procedure.
The modem will return ERROR if modem-on-hold is not enabled or if the
modem is in an idle condition. The modem will return the string response
+PMHR: <value> where <value> is a decimal value corresponding to the
status of the modem's hold exchange procedure as defined below. This
response may be delayed depending upon the context under which the
+PMHR command is made, i.e., if the +PMHR is in response to an
incoming modem-on-hold or if it is initiating a request.
Note: If modem-on-hold is enabled but the remote server does not support
V.92 then the modem will always report 0 to show that the hold request is
denied.
Response:
+PMHR:<value>
The value corresponds to the maximum hold time the server or hold-
granting modem will allow.
+PMHR0 V.92 MOH request denied or not available.
+PMHR1 MOH with 10-second timeout Granted.
+PMHR2 MOH with 20-second timeout Granted.
+PMHR3 MOH with 30-second timeout Granted.
+PMHR4 MOH with 40-second timeout Granted.
+PMHR5 MOH with 1-minute timeout Granted.
+PMHR6 MOH with 2-minute timeout Granted.
+PMHR7 MOH with 3-minute timeout Granted.
+PMHR8 MOH with 4-minute timeout Granted
+PMHR9 MOH with 6-minute timeout Granted.
+PMHR10 MOH with 8-minute timeout Granted.
+PMHR11 MOH with 12-minute timeout Granted.
+PMHR12 MOH with 16-minute timeout Granted.
+PMHR13 MOH with indefinite timeout Granted.
OK 0-13 in V.92 Mode (+MS=V92)
Result Codes:
ERROR
Command: +PMHT
Modem-on-Hold Timer
Description:
Controls whether or not the modem will grant or deny a modem-on-hold
(MOH) request as well as setting the MOH Timeout value.
+PMHT0 Deny V.92 modem-on-hold Request (Default.)
+PMHT1 Grant MOH with 10-second timeout
+PMHT2 Grant MOH with 20-second timeout
+PMHT3 Grant MOH with 30-second timeout
+PMHT4 Grant MOH with 40-second timeout
+PMHT5 Grant MOH with 1 minute timeout
+PMHT6 Grant MOH with 2 minute timeout
+PMHT7 Grant MOH with 3 minute timeout
+PMHT8 Grant MOH with 4 minute timeout
+PMHT9 Grant MOH with 6 minute timeout
+PMHT10 Grant MOH with 8 minute timeout
+PMHT11 Grant MOH with 12 minute timeout
+PMHT12 Grant MOH with 16 minute timeout
+PMHT13 Grant MOH with indefinite timeout
OK 0-13 in V.92 Mode (+MS=V92)
Defined Values:
Result Codes:
ERROR
Report Commands:
+PMHT? Reports Current or Selected Values.
Response: +PMHT: <value>
Example: +PMHT: 0 For the default setting.
+PMHT=? Reports Supported Range of Parameter Values.
Response: +PMHT: (<value> range)
Example: +PMHT: (0,1,2,3,4,5,6,7,8,9,10,11,12,13)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: +PIG
Description:
PCM Upstream Ignore
Controls the selection of PCM upstream in the modem. The actual state of
PCM upstream is determined by the state of this command as well as the
state of a negotiated handshake with a V.92-compliant server in V.92
Mode.
Defined Values:
Result Codes:
+PIG0
+PIG1
Enable PCM upstream negotiation.
Disable PCM upstream negotiation. (Default.)
OK 0 or 1 in V.92 Mode (+MS=V.92)
ERROR
Report Commands:
+PIG?
Reports Selected Value(s).
Response: +PIG: <value>
Example: +PIG: 1 For the default setting.
Reports Supported Range of Parameter Values.
Response: +PIG: (<value> range)
Example: +PCW: (0,1)
+PIG=?
Command: +PMHF
Description:
V.92 Modem-on-Hold Hook Flash
Causes the modem to initiate the flash hook sequence when in the
modem-on- hold procedure. This enables switching to the second call
(incoming or outgoing).
This command applies only to V.92 modem-on-hold. There are no
parameters associated with this command.
Result Code:
OK
ERROR
When the modem completes the flash hook sequence.
If this command is initiated and the modem is not on hold.
Command: +PQC
Description:
V.92 Phase 1 and Phase 2 Control
Controls the global enabling or disabling of the V.92 shortened Phase 1
and Phase 2 startup procedures. This command is used in conjunction with
the +PSS command.
Defined Values:
+PQC0
+PQC1
+PQC2
+PQC3
Enable Short Phase 1 and Short Phase 2. (Default.)
Enable Short Phase 1 only.
Not supported.
Disable Short Phase 1 and Short Phase 2.
Result Codes:
OK 0, 1, or 3 in V.92 Mode (+MS=V.92)
ERROR
Report Commands:
+PQC?
Reports Selected Values.
Response: +PQC: <value>
Example: +PQC: 0
+PQC=?
Reports Supported Range of Parameter Values.
Response: +PQC: (<value> range)
Example: +PQC: (0,1,3)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Command: +PSS
Description:
Use Short Sequence
Causes a calling modem to force either a V.92 short or full startup
sequence as defined by the +PQC command on the next and subsequent
connections.
Defined Values:
+PSS0
The modems decide whether or not to use the short startup
procedures. The short startup procedures can only be used if
enabled by the +PQC command. (Default.)
Reserved.
Forces the use of the full startup procedures on the next and
subsequent connections independent of the setting of the
+PQC command.
+PSS1
+PSS2
Result Codes:
OK 0 - 2 in V.92 Mode (+MS=V.92)
ERROR
Report Commands:
+PSS?
Reports Selected Values.
Response: +PSS: <value>
Example: +PSS: 0 For the default <value>.
Reporting Supported Range of Parameter Values:
Response: +PSS: (<value> range)
Example: +PSS: (0,1,2)
+PSS=?
Command: -QCPC
Description:
Force Full Startup Procedure on Next Connection
Causes the modem to use full startup procedures on the next connection
attempt regardless of the setting of the +PQC command. After this attempt,
the modem will select the startup procedure as defined by the +PQC
command. If a shortened startup procedure is enabled by the +PQC
command, then the quick connect profile will also be updated on the next
connection attempt.
Result Code:
OK In V.92 Mode (+MS=V.92)
ERROR
Command: -QCPS
Description:
Enable Quick Connect Profile Save
This command controls whether or not the modem will save the generated
quick connect profile.
Defined Values:
Result Codes:
-QCPS0
-QCPS1
Do not allow the quick connect profile to be saved.
Allow the quick connect profile to be saved. (Default.)
OK in V.92 Mode (+MS=V.92) and quick connect is enabled (+PSS = 0)
ERROR
Report Commands:
-QCPS?
Reports Selected Value(s).
Response: -QCPS: <value>
Example: -QCPS: 1 For the default setting.
-QCPS=? Reports Supported Range of Parameter Values.
Response: -QCPS: (<value> range)
Example: -QCPS: (0,1)
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Chapter 5 – AT Commands, S-Registers, and Result Codes
S-Registers
Certain modem values, or parameters, are stored in memory locations called S-registers. Use the S command to
read or to alter the contents of S-registers (see previous section). * Register value may be stored on one of two user
profiles with the command &W.
Register Unit
Range
Default
Description
S0
S1
S2
1 ring
0–255
0
Number of Rings to Auto-Answer: Sets the number of rings until
the modem answers. ATS0=0 disables autoanswer completely. *
1 ring
0–255
0–255
0
Ring Counter: Counts the rings that have occurred. S1 is cleared if
no rings occur over eight-second intervals.
decimal
43 (+)
Escape Character: Holds the decimal value of the ASCII character
used as the escape character. The default value corresponds to an
ASCII ‘+’. A value over 127 disables the escape process; e.g., no
escape character will be recognized.*
S3
S4
decimal
decimal
0–127
0–127
13 (^M)
10 (^J)
Carriage Return Character: Sets the command line and result code
terminator character. Pertains to asynchronous operation only.
Line Feed Character: Sets the character recognized as a line feed.
Pertains to asynchronous operation only. The Line Feed control
character is output after the Carriage Return Control character if
verbose result codes are used.
S5
decimal
0–255
8 (^H)
Backspace Character : Sets the character recognized as a
backspace. Pertains to asynchronous operation only. The modem will
not recognize the Backspace character if it is set to a value that is
greater than 32 ASCII. This character can be used to edit a command
line. When the echo command is enabled, the modem echoes back to
the local DTE the Backspace character, an ASCII space character
and a second Backspace character; this means a total of three
characters are transmitted each time the modem processes the
Backspace character.
S6
seconds 2–255
2
Wait Time Before Blind Dialing or for Dial Tone: 1. Sets the length
of time, in seconds, that the modem will wait before starting to dial
after going off-hook when blind dialing. This operation, however, may
be affected by some ATX options according to country restrictions.
The “Wait for Dial Tone” call progress feature (W dial modifier in the
dial string) will override the value in register S6. (When configured for
US).
2. Sets the length of time, in seconds, that the modem will wait for
dial tone when encountering a “W” dial modifier before returning NO
DIAL TONE result code. (W class). Default is country-dependent. The
modem always pauses for a minimum of 2 seconds, even if the value
of S6 is less than 2 seconds. *
S7
seconds 1–255*
50
Wait Time for Carrier, Silence, or Dial Tone:
1. Sets the length of time, in seconds, that the modem will wait for
carrier before hanging up. The timer is started when the modem
finishes dialing (originate), or 2 seconds after going off-hook (answer).
In originate mode, the timer is reset upon detection of answer tone if
allowed by country restrictions.
2. Sets the length of time, in seconds, that modem will wait for silence
when encountering the @ dial modifier before continuing with the next
dial string parameter.
3. Sets the length of time, in seconds, that the modem will wait for dial
tone when encountering a “W” dial modifier before continuing with the
next dial string parameter. (US model.)
The default is country dependent. *
S8
seconds 2–255
2
Pause Time for Dial Delay: Sets the time, in seconds, that the
modem must pause when the “,” dial modifier is encountered in the
dial string. *
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit
Range
Default
Description
S9
0.1 s
1–255
6
Carrier Detect Response Time: Supported for backward
compatibility only. No value can be written. Responds with default
value. *
S10
0.1 s
1–255
14
Lost Carrier to Hang Up Delay: Sets the length of time, in tenths of
a second that the modem waits before hanging up after a loss of
carrier. This allows for a temporary carrier loss without causing the
local modem to disconnect. When register S10 is set to 255, the
modem functions as if a carrier is always present. *
The actual interval the modem waits before disconnecting is the value
in register S10 minus the value in register S9. Therefore, the S10
value must be greater than the S9 value or else the modem
disconnects before it recognizes the carrier.
Note: For Call Waiting detection, if the modem is set to US country
code and S10 >=16, then the modem will detect the Call Waiting tone
and hang-up the line. If S10 <16, the modem will not detect Call
Waiting tone.
S11
S12
0.001 s
0.02 s
50–255
0–255
95
50
DTMF Tone Duration: 1. For US models, S11 sets the duration of
tones in DTMF dialing (has no effect on pulse dialing).
2. For W-class models, S11 is a country parameter. The default is
country dependent. *
Escape Prompt Delay (EPD): Defines the maximum period, in
fiftieths of a second, allowed between receipt of the last character of
the three escape character sequence from the DTE and sending of
the OK result code to the DTE. If any characters are detected during
this time, the OK will not be sent. Sending of the OK result code does
not affect entry into command mode. (See 3.1.3). *
S14
138 (8Ah) General Bit-Mapped Options Status: Indicates the status of
command options.
Bit 0 This bit is ignored.
Bit 1 Command echo (En)
0 =
1 =
Disabled (E0)
Enabled (E1) (Default.)
Bit 2 Quiet mode (Qn)
0 =
1 =
Send result codes (Q0) (Default.)
Do not send result codes (Q1)
Bit 3 Result codes (Vn)
0 =
1 =
Numeric (V0)
Verbose (V1) (Default.)
Bit 4 Reserved
Bit 5 Tone (T)/Pulse (P)
0 =
1 =
Tone (T) (Default.)
Pulse (P)
Bit 6 Reserved
Bit 7 Originate/Answer
0 =
1 =
Answer
Originate (Default.)
S19 is supported for backward compatibility only. No value can be
written. Responds with default value.
S16
0
Test Mode Bit-Mapped Options Status: Indicates the test in
progress status.
Bit 0 Local analog loopback
0 =
1 =
Bits 1-7
Disabled (Default.)
Enabled (&T1)
Not used
S19 and S20
Reserved
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit
S21
Range
Default
Description
52 (34h) V.24/General Bit-Mapped Options Status: Indicates the status of
command options.
Bits 0 - 1
Bit 2
0 =
1 =
Bits 3-4
0 =
Reserved (0)
CTS behavior (&Rn)
CTS tracks RTS (&R0)
CTS always on (&R1) (Default.)
DTR behavior (&Dn)
&D0 selected
1 =
&D1 selected
2 =
3 =
&D2 selected (Default.)
&D3 selected
Bit 5
0 =
RLSD (DCD) behavior (&Cn)
&C0 selected
1 =
Bit 6
0 =
&C1 selected (Default.)
DSR behavior (&Sn)
&S0 selected (Default.)
&S1 selected
1 =
Bit 7
0 =
Long space disconnect (Yn)
Y0 (Default.)
1 =
Y1
S22
117 (75h) Speaker/Results Bit-Mapped Options Status: Indicates the status
of command options.
Default:
Bits 0-1
117 (75h) (01110101b)
Speaker volume (Ln)
Off (L0)
0 =
1 =
2 =
3 =
Low (L1) (Default.)
Medium (L2)
High (L3)
Bits 2-3
Speaker control (Mn)
Disabled (M0)
Off on carrier (M1) (Default.)
Always on (M2)
On during handshake (M3)
Limit result codes (Xn)
X0
0 =
1 =
2 =
3 =
Bits 4-6
0 =
4 =
X1
5 =
X2
6 =
7 =
X3
X4 (Default.)
Bit 7 Reserved
S23
0
0
General Bit-Mapped Options Status: Indicates the status of
command options.
Bits 0-6
Bits 6-7
Not used
Guard tone (&Gn)
None (&G0) (Default.)
None (&G1)
0 =
1 =
2 =
1800 Hz (&G2)
S24
seconds 0–255
Sleep Inactivity Timer: Sets the length of time, in seconds, that the
modem will operate in normal mode with no detected telephone line
or DTE line activity before entering low-power sleep mode. The timer
is reset upon any DTE line or telephone line activity. If the S24 value
is zero, neither DTE line nor telephone inactivity will cause the
modem to enter the sleep mode.
S25
S26
0.01 s
0.01 s
0–255
0–255
5
1
Delay to DTR OFF: Sets the length of time that the modem will
ignore DTR for taking the action specified by &Dn. Its units are
seconds for synchronous modes and one hundredths of a second for
other modes.
RTS-to-CTS Delay: Sets the time delay, in hundredths of a second,
before the modem turns CTS ON after detecting an OFF-to-ON
transition on RTS when &R0 is commanded. Pertains to synchronous
operation only.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit
S27
Range
Default
Description
73 (49Ah) General Bit-Mapped Options Status: Indicates the status of
command options.
Default:
Bits 0, 1, 3
3 1 0
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
Bit 2
73 (49h) (01001001b)
Synchronous/asynchronous selection (&Mn/&Qn)
&M0 or &Q0
&M1 or &Q1
&M2 or &Q2
&M3 or &Q3
Reserved
&Q5 (Default.)
&Q6
Leased line control (&Ln)
Dial up line (&L0) (Default.)
Internal clock select (&Xn)
Internal clock (&X0) (Default.)
External clock (&X1)
Slave clock (&X2)
0 =
Bits 4 - 5
0 =
1 =
2 =
Bit 6 CCITT/Bell mode select (Bn)
0 =
CCITT mode (B0)
1 =
Bell mode (B1) (Default.)
Bit 7 - Reserved
S28
0
General Bit-Mapped Options Status: Indicates bit mapped options
status.
Default:
0
Bits 0 - 1
Reserved
Bit 2 Reserved (always 0).
Bits 3 - 4 Pulse dialing (&Pn)
0 = 39%-61% make/break ratio at 10 pulses per second (&P0)
1 = 33%-67% make/break ratio at 10 pulses per second (&P1)
2 = 39%-61% make/break ratio at 20 pulses per second (&P2)
3 = 33%-67% make/break ratio at 20 pulses per second (&P3)
Bit 5-7Reserved
S29
S30
10 ms
0–255
0–255
70
0
Flash Dial Modifier Timer: Sets the length of time, in units of 10 ms,
that the modem will go on-hook when it encounters the flash (!) dial
modifier in the dial string. S29 is a country dependent parameter. The
S29 value cannot be changed using S29=XX. Default: 70 (700 ms)
for U.S.
10 s
Disconnect Inactivity Timer: Sets the length of time, in tens of
seconds, that the modem will stay online before disconnecting when
no data is sent or received. In error-correction mode, any data
transmitted or received will reset the timer. In other modes, any data
transmitted will reset the timer. The timer is inoperative in
synchronous mode.
S31
192 (C0h) General Bit-Mapped Options Status: Indicates bit mapped options
status.
Default:
192 (C0h) (11000000b)
Bit 0 Single line connect message enable/disable (\Vn)
0 =
(Default.)
1 =
Messages controlled by S95, Wn and Vn (\V0)
Single line connect message (\V1)
Bit 1 Reserved (0)
Bits 2-3 Error correction progress messages (Wn)
0 =
DTE speed only (W0) (Default.)
Full reporting (W1)
DCE (line) speed only (W2)
1 =
2 =
Bits 4-5
Caller ID (+VCID)
0 =
1 =
2 =
Caller ID disabled (+VCID=0) (Default.)
Short (formatted) Caller ID enabled (+VCID=1)
Long (unformatted) Caller ID enabled (+VCID=2)
Reserved (Default = 11b)
Bits 6-7
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Description
Register Unit
S36
Range
Default
7
LAPM Failure Control: This value indicates what should happen
upon a LAPM failure. These fallback options are initiated immediately
upon connection if S48=128. If an invalid number is entered, the
number is accepted into the register, but S36 will act as if the default
value has been entered. *
Default: 7 (00000111b)
Bits 0-2
0 = Modem disconnects.
1 = Modem stays on-line and a Direct mode connection is
established.
2 = Reserved.
3 = Modem stays on-line and a Normal mode connection is
established.
4 = An MNP connection is attempted and if it fails, the modem
disconnects.
5 = An MNP connection is attempted and if it fails, a Direct
mode connection is established.
6 = Reserved.
7 = An MNP connection is attempted and if it fails, a Normal
mode connection is established. (Default.)
Bits 3-7
Reserved
S38
seconds 0–255
20
Delay Before Forced Hang Up: Specifies the delay between the
modem's receipt of the H command to disconnect (or ON-to-OFF
transition of DTR if the modem is programmed to follow the signal),
and the disconnect operation. Applicable to error-correction
connection only. This parameter can be used to ensure that data in
the modem buffer is sent before the modem disconnects.
If S38 is set to a value between 0 and 254, the modem will wait that
number of seconds for the remote modem to acknowledge all data in
the modem buffer before disconnecting. If time expires before all data
is sent, the NO CARRIER result code will be issued to indicate that
data has been lost. If all data is transmitted prior to time-out, the
response to the H0 command will be OK.
If S38 is set to 255, the modem does not time-out and continues to
attempt to deliver data in the buffer until the connection is lost or the
data is delivered.
S39
3
Flow Control Bit-Mapped Options Status.
Default:
Bits 0-2
3 (00000011b)
Status of command options
No flow control
0 =
3 =
4 =
5 =
6 =
RTS/CTS (&K3) (Default.)
XON/XOFF (&K4)
Transparent XON (&K5)
Both methods (&K6)
Reserved
Bits 3-7
S40
104 (68h) General Bit-Mapped Options Status. Indicates the status of
command options.
Default:
Bits 0-1
104 (68h) (01101000b)
MNP Extended Services (-Kn)
Disable extended services (-K0) (Default.)
Enable extended services (-K1)
Enable extended services (-K2)
0 =
1 =
2 =
Bit 2 Reserved
Bits 3-5
0 =
Break Handling (\Kn)
\K0
1 =
\K1
2 =
\K2
3 =
\K3
4 =
\K4
5 =
Bits 6-7
\K5 (Default.)
Reserved*
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit
S41
Range
Default
Description
195 (C3h) General Bit-Mapped Options Status. Indicates the status of
command options. *
Default:
Bits 0 -1
13 (C3h) (00001101b)
Compression selection (%Cn)
Disabled (%C0)
0 =
1 =
2 =
3 =
MNP 5 (%C1)
V.42 bis (%C2)
MNP 5 and V.42 bis (%C3) (Default.)
Auto retrain and fallback/fall forward (%En)
Bit 2 Meaning
Bits 2, 6
Bit 6
0
0
1
0
1
0
Retrain and fallback/fall forward disabled (%E0)
Retrain enabled (%E1)
Fallback/fall forward enabled (%E2) (Default.)
Bit 3 Reserved
Bits 4-5 Reserved
Bit 7 Reserved
S46
S48
138
7
Data Compression Control. Controls selection of compression. *
The following actions are executed for the given values:
S46=136 Execute error correction protocol with no compression.
S46=138 Execute error correction protocol with compression. (Default.)
V.42 Negotiation Control. Negotiation process determines the
capabilities of the remote modem. However, when the capabilities of
the remote modem are known and negotiation is unnecessary, this
process can be bypassed if so desired.
Range: 0, 7, or 128 If an invalid number is entered, it is accepted into
the S-Parameter, but S48 will act as if 128 has been entered.
S48=0 Disable negotiation; bypass the detection and negotiation
phases; and proceed with LAPM.
S48=7 Enable negotiation. (Default.)
S48=128 Disable negotiation; bypass the detection and negotiation
phases; and proceed at once with the fallback action specified
in S36. Can be used to force MNP.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Register Unit
S86
Range
Default
Description
0–26
21
Call Failure Indication. When the modem issues a NO CARRIER
result code, a value is written to S86 Register to help determine the
reason for the failed connection. S86 records the first event that
contributes to a NO CARRIER message. The code definitions are:
S86=0
S86=1
Normal hangup, no error occurred.
Reserved.
S86=2
Reserved.
S86=3
S86=4
Call Waiting caused disconnect.
Physical carrier loss.
S86=5
S86=6
S86=7
S86=8
No error correction at the other end.
No response to feature negotiation.
This modem is async only; the other modem is sync only.
No framing technique in common.
No protocol in common.
S86=9
S86=10
S86=11
S86=12
S86=13
S86=14
S86=15
S86=16
S86=17
S86=18
S86=19
S86=20
S86=21
S86=22
S86=23
S86=24
S86=25
S86=26
Bad response to feature negotiation.
No sync information from the remote modem.
Normal hangup initiated by the remote modem.
Retransmission limit reached.
Protocol violation occurred.
Lost DTR.
Received GSTN cleardown.
Inactivity timeout.
Speed not supported.
Long space disconnect.
Key abort disconnect.
Clears previous disconnect reason.
No connection established.
Disconnect after three retrains.
Call Waiting tone detected.
Extension pickup detected.
Remote hangup detected.
S91
dBm
0–15
10
PSTN Transmit Attenuation Level. In non-PCM modes (V.90 or
K56flex are PCM modes), S91 sets the transmit attenuation level from
0 to 15 dBm for the PSTN mode, resulting in a transmit level from 0 to
-15 dBm. In some countries, the transmit level may not be changed
and there are checks to prevent transmit attenuation level change.
The default is country dependent.
S95
0
Extended Result Codes Control. A bit set to a 1 in this parameter,
in conjunction with the W command, will enable the corresponding
extended result code. *
The +MR, +ER, and +DR settings also control S95 bits 2, 3, and 5,
respectively. The more recent settings of +MR, +ER, and +DR, or
host writing of S95 bits 2, 3, and 5, along with the W command
setting, determine the corresponding actual result code reporting (see
+MR, +ER, DR, and W commands).
Bit 0 CONNECT result code indicates DCE speed instead of DTE speed.
Bit 1 Append/ARQ to CONNECT XXXX result code in error-correction
mode (XXXX = rate).
Bit 2 Enable +MCR: XXXX result code (XXXX = modulation) and
+MRR: XXXX result code (XXXX = rate). (Also, see +MR.)
Bit 3 Enable +ER: XXXX result code (XXXX = protocol identifier).
Bit 4 Reserved.
Bit 5 Enable +DR: XXXX result code (XXXX = compression type).
Bits 6-7 Reserved.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Description
Register Unit
S210
Range
Default
0–255
13 (0Dh) V.34 Symbol Rate. The bits in this parameter control V.34 symbols rates
and enable/disable V.34 asymmetric rates. This parameter is used for
diagnostic purposes only.
Default: 13 (0Dh) (00001101b)
Bits 0 -2 Selects the range of allowed V.34 symbol rates.
2
0
0
0
0
1
1
1
0
0
1
1
0
0
0
0
1
0
1
0
1
Symbol Rates (baud)
2400 only
2400 only (no 2734)
2400, 2800
2400, 2800, 3000
2400, 2800, 3000, 3200
2400, 2800, 3000, 3200, 3429 (Default.)
Bit 3 Enable/disable V.34 asymmetric rates.
0 =
1 =
Disable asymmetric rates
Enable asymmetric rates (Default.)
Bits 4-7 Reserved.
Examples
S210=13
S210=5
Enable asymmetric rates with all symbol rates available
(Default.).
Disable asymmetric rates with all symbol rates
available.
S210=8
S210=11
Enable asymmetric rates with only 2400 baud available.
Enable asymmetric rates with 2400 to 3000 baud
available.
* Register value may be stored on one of two user profiles with the &W command.
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Result Codes
In command mode your modem can send responses called result codes to your computer. Result codes are used by
communications programs and can also appear on your monitor.
Result Codes
Short Form
Long Form
+F4
0
+FCERROR
OK
1
CONNECT
2
RING
3
4
NO CARRIER
ERROR
5
6
7
CONNECT1200
NO DIAL TONE
BUSY
8
9
NO ANSWER
CONNECT600
CONNECT 2400
CONNECT 4800
CONNECT 9600
CONNECT 7200
CONNECT 12000
CONNECT 14400
CONNECT 19200
CONNECT 38400
CONNECT 57600
CONNECT 115200
CONNECT 230400
CONNECT 75TX/1200RX
CONNECT 1200TX/75RX
DELAYED
10
11
12
13
14
15
16
17
18
19
20
22
23
24
32
33
35
40
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
62
63
64
66
67
69
70
BLACKLISTED
FAX
DATA
+MRR: 300
+MRR: 1200/75
+MRR: 75/1200
+MRR: 1200
+MRR: 2400
+MRR: 4800
+MRR: 7200
+MRR: 9600
+MRR: 12000
+MRR: 14400
+MRR: 16800
+MRR: 19200
+MRR: 21600
+MRR: 24000
+MRR: 26400
+MRR: 28800
CONNECT 16800
CONNECT 21600
CONNECT 24000
CONNECT 26400
CONNECT 28800
+DR: A LT
+DR: V 42B
+DR: N ONE
+ER: N ONE
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Short Form
Long Form
77
+ER: L APM
78
+MRR: 31200
79
+MRR: 33600
80
+ER: A LT
81
83
+ER: A LT-CELLULAR
LINE-IN-USE
84
91
CONNECT 33600
CONNECT 31200
+MCR: B 103
134
135
136
137
138
139
140
141
142
144
145
150
151
152
153
154
155
156
157
158
159
160
161
162
165
166
167
168
169
170
171
172
173
174
175
176
177
178
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
+MCR: B 212
+MCR: V 21
+MCR: V 22
+MCR: V 22B
+MCR: V 23
+MCR: V 32
+MCR: V 32B
+MCR: V 34
+MCR: K 56
+MCR: V 90
+MRR: 32000
+MRR: 34000
+MRR: 36000
MRR: 38000
+MRR: 40000
+MRR: 42000
+MRR: 44000
+MRR: 46000
+MRR: 48000
+MRR: 50000
+MRR: 52000
+MRR: 54000
+MRR: 56000
CONNECT 32000
CONNECT 34000
CONNECT 36000
CONNECT 38000
CONNECT 40000
CONNECT 42000
CONNECT 44000
CONNECT 46000
CONNECT 48000
CONNECT 50000
CONNECT 52000
CONNECT 54000
CONNECT 56000
CONNECT 230400
CONNECT 28000
CONNECT 29333
CONNECT 30667
CONNECT 33333
CONNECT 34667
CONNECT 37333
CONNECT 38667
CONNECT 41333
CONNECT 42667
CONNECT 45333
CONNECT 46667
CONNECT 49333
CONNECT 50667
CONNECT 53333
CONNECT 54667
+MRR: 28000
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Chapter 5 – AT Commands, S-Registers, and Result Codes
Short Form
Long Form
196
197
198
199
200
201
202
203
204
205
206
207
208
209
+MRR: 29333
+MRR: 30667
+MRR: 33333
+MRR: 34667
+MRR: 37333
+MRR: 38667
+MRR: 41333
+MRR: 42667
+MRR: 45333
+MRR: 46667
+MRR: 49333
+MRR: 50667
+MRR: 53333
+MRR: 54667
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Chapter 6 – Fax Class 1 and Class 1.0
Commands
Fax I/O Processing
The fax I/O interface supports asynchronous serial and parallel interfaces. The character format is 8 bit
data, no parity, and 1 stop bit. Start and stop elements are removed from the transmit data and added to
the receive data. Both transmit and receive data are buffered. Flow control using XON/XOFF or RTS/CTS
is provided.
Unique control character strings are identified, filtered, or reinserted into the I/O data stream. These
control characters and their resultant action are described below.
DTE-to-Modem Transmit Data Stream
Characters Detected
<DLE><data>
Action Taken
Delete <DLE><data> characters.
<DLE><ETX>
<DLE><DLE>
Recognize as a string terminator and take appropriate action.
Replace with single <DLE> character.
Modem-to-DTE Receive Data Stream
Characters Detected
Action Taken
<DLE>
Insert extra <DLE> ahead of <DLE>.
The modem also identifies the end of a frame by inserting <DLE><ETX> into the data stream after the
FCS bytes.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Fax Mode Selection
Fax Class 1 and Fax Class 1.0 commands are identified in Table 6-1. Fax Class 1.0 includes all Fax
Class 1 commands
Table 6-1. Fax Class 1 and Fax Class 1.0 Commands
Command/Parameter
Function
Applicable in Applicable in
Fax Class 1
Fax Class 1.0
+FCLASS=<class>
+FAA=<value>
+FAE=<value>
+FTS=<time>
+FRS=<time>
+FTM=<mod>
+FRM=<mod>
+FTH=<mod>
+FRH=<mod>
+FAR=<off/on>
+FCL=<time>
+FDD=<value>
+FIT=<time>, <action>
+FPR=<rate>
+FMI?
Select, read or test service class
Auto answer enable
Auto answer enable
Stop transmission and pause
Wait for silence
Transmit data with <mod> carrier
Receive data with <mod> carrier
Transmit HDLC data with <mod> carrier
Receive HDLC data with <mod> carrier
Adaptive reception control
Carrier loss timeout
Double escape character replacement control
DTE inactivity timeout
Fixed DTE Rate
Report manufacturer ID
Report model ID
Report revision ID
Flow Control
Local DTE-modem flow control (see Call
Control Section)
X
-
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
-
-
-
-
-
-
-
-
-
+FMM?
+FMR?
+FLO
&K
X
A
Answer
Dial
X
X
X
X
X
X
D<string>
H
Hangup (see Call Control Section)
X stands for Applicable. - stands for Not Applicable.
Fax Origination
Origination of fax calls is made using the ATD command. Upon completion of the dial function, a calling
tone at 1100 Hz is transmitted, with a cadence of 0.5 seconds on and 3 seconds off. The modem
automatically enters mode +FRH=3 and sends the CONNECT message to the DTE when FSK flags are
detected from the remote.
Fax Answering
Answering of fax calls is identical to answering of data calls with the exception that the modem enters the
fax handshaking mode instead of the data handshaking mode after going off-hook. If +FAE=0, the
modem, after sending answer tone, automatically enters fax mode (+FTH=3), sends the CONNECT
message to the DTE, and starts sending FSK flags. If +FAE=1, the modem determines whether the caller
is a data modem or fax modem and sends the DATA or FAX result code, respectively, to the DTE.
Fax Control Transmission
Fax control transmission is initiated by the +FTH=<mod> command. After this command is issued, the
modem generates the CONNECT message and transmits carrier in the modulation scheme specified by
the parameter n. The modem then transmits HDLC flags for a minimum of 1 second. The modem
continues to transmit the HDLC flags until it receives a character from the DTE.
When characters are received from the DTE, the modem adds start and end flags, performs zero-bit
insertion, generates FCS, and deletes <DLE><chr> character pairs before transmitting the characters to
the remote fax machine. Each <DLE><DLE> sequence is transmitted as a single <DLE>. <DLE><ETX>
is considered as the end of frame marker and is not transmitted. All data received from the DTE after
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
<DLE><ETX> is ignored by the modem until the modem generates either the CONNECT, OK, or ERROR
result code.
If no more data is in the transmit buffer and the final bit was a 1 (bit 4 of the second byte received from
the DTE), the modem generates the OK result code and returns to the command mode. If the final bit was
a 0, the modem generates the CONNECT message and waits for further data from the DTE while
transmitting HDLC flags. If no more data is received before 5 seconds elapse, the modem drops carrier,
goes on-hook, and generates the ERROR result code.
Fax Control Reception
Fax control reception is initiated using the AT+FRH=<mod> command. After this command is issued, the
modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is detected
before the period of time specified by register S7 expires, the modem generates the NO CARRIER
message and returns to command mode.
If a carrier is detected that is not the one specified by the parameter n, the modem generates the
+FCERROR message and returns to the command mode. If the specified carrier is detected, the modem
generates the CONNECT message and enters the HDLC receive mode.
In HDLC receive mode, the modem receives HDLC frames from the remote fax machine, strips the flags,
performs zero-bit deletion, performs error checking, and handles <DLE><chr> character pairs before
passing the data to the DTE. The modem prefixes each <DLE> character with another <DLE> character
before sending it to the DTE. After the last byte in the frame, the modem sends <DLE><ETX> to the DTE
marking the end of the frame. The modem then generates either the OK message if no errors were
detected or the ERROR message if errors were detected (FCS is incorrect), and returns to command
mode.
While in command mode, the modem continues to receive data in the selected modulation scheme, and
sends the data after sending the CONNECT message to the DTE when the DTE reissues the +FRH
command with the same parameter. If the DTE issues the +FRH command with a different parameter, the
modem clears all buffers and proceeds as described previously.
If carrier is lost while in command mode and the DTE reissues the +FRH command with the same
parameter, and there is no data in the buffer, the modem sends the ERROR result code to the DTE and
returns to the command mode. If there is data in the buffer, the modem sends the next frame of buffered
data to the DTE, followed by <DLE><ETX>, and either the ERROR result code if errors were detected or
the OK result code if no errors were detected. The modem then returns to command mode.
The modem concludes an error is detected if carrier is lost for any period of time during or before the
reception of a frame. If carrier is lost for a time period longer than the time specified by the register S10,
the modem finishes delivering the data in the receive buffer (if any) to the DTE, sends <DLE><ETX>,
generates the ERROR message, and returns to command mode. All subsequent data received from the
remote is discarded.
If the modem detects a frame abort sequence (seven consecutive ones with no zero insertion) while it is
waiting for a frame beginning flag (it was receiving HDLC flags), it will wait for the HDLC flags again until
either carrier is lost or the DTE aborts the process by sending an abort character or by dropping DTR with
&D2 in effect. If the frame abort sequence is detected while the modem is receiving a frame it finishes
delivering the data in the receive buffer (if any) to the DTE, sends <DLE><ETX>, generates the ERROR
message, and returns to command mode. The modem keeps looking for HDLC flags followed by more
data from the remote, with the selected modulation scheme.
If the modem detects a receive buffer overflow condition, it concludes that there was an FCS error in that
frame. The modem will receive more frames only if a starting flag is detected and there is room in the
receive buffer. If a starting flag is detected and there is no room in the buffer, the modem discards all data
in that frame.
If the modem receives any character from the DTE after the +FRH command (except flow control
characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR
signal while &D1 is in effect, it sends <DLE><ETX> to the DTE, generates OK result code, and returns to
command mode. The receive buffer is cleared and all data received from the remote is discarded. If the
modem detects a DTR drop while &D2 is in effect, it goes on-hook, sends <DLE><ETX> to the DTE,
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
generates OK result code, and returns to command mode. If the modem detects a DTR drop while &D3 is
in effect, the modem performs a warm reset.
Fax Data Transmission
Fax data transmission is initiated by the AT+FTM=<mod> command. After this command is issued, the
modem generates the CONNECT message and transmits carrier in the modulation scheme specified by
the parameter n. The modem then transmits constant 1 bits for a minimum of one second and continues
to transmit constant 1 bits until it receives a character from the DTE.
When data is received from the DTE, the modem deletes start and stop bits and deletes all <DLE><chr>
character pairs before transmitting the data to the remote. Each <DLE><DLE> sequence is transmitted as
a single <DLE>. <DLE><ETX> is considered as the end of stream marker, and is not transmitted. All data
received from the DTE after the <DLE><ETX> is ignored by the modem until the modem generates either
the CONNECT, OK, or ERROR result code.
If no more data is in the transmit buffer, and the last transmitted character was not an ASCII NULL, the
modem generates the OK result code and returns to the command mode. If the last character transmitted
was an ASCII NULL, the modem generates the CONNECT message to the DTE and waits for further data
from the DTE while transmitting NULLs to the remote. If more data is received before five seconds
elapse, the modem continues to transmit the data as described in the previous paragraph. If five seconds
elapse and no data is received from the DTE, the modem drops carrier, goes on-hook, and generates the
ERROR result code.
Fax Data Reception
Fax data reception is initiated using the AT+FRM=<mod> command. After this command is issued, the
modem looks for carrier in the modulation scheme specified by the parameter n. If no carrier is detected
before the period of time specified by register S7 expires, the modem generates the NO CARRIER
message and returns to command mode. If a V.21 carrier is detected when a high-speed carrier is
expected, the modem generates the +FCERROR message and returns to the command mode. If the
specified carrier is detected, the modem generates the CONNECT message and enters the data receive
mode.
While in data receive mode, the modem receives data from the remote, adds start and stop bits, and
handles <DLE><chr> character pairs before passing the data to the DTE. The modem prefixes each
<DLE> character with another <DLE> character before sending it to the DTE.
If the modem detects a receive buffer overflow condition, it stops receiving from the remote until there is
room in the receive buffer. The modem informs the DTE of the buffer overflow after it sends to the DTE
the last character that was stored in the buffer before the overflow occurred.
If the modem receives any character from the DTE after the +FRM command (except flow control
characters if software flow control is in effect), or if the modem detects a high-to-low transition of the DTR
signal while &D1 is in effect, it sends <DLE><ETX> to the DTE, generates the OK result code, and
returns to command mode. The receive buffer is cleared and all data received from the remote is
discarded. If loss of DTR is detected while &D2 is in effect, the modem goes on-hook, sends
<DLE><ETX> followed by OK result code to the DTE, and returns to command mode. If the modem
detects a DTR drop while &D3 is in effect, the modem performs a warm reset.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Commands and Parameters
Mode Entry Commands
+FCLASS=1 Select Facsimile Class 1 Mode
+FCLASS=1 selects the Fax Class 1 Mode. The Fax Class 1 Mode commands and responses described
in this section are applicable when command +FCLASS=1 as shown in Table 6-1.
+FCLASS=1.0 - Select Facsimile Class 1.0 Mode
+FCLASS=1.0 selects the Fax Class 1.0. The Fax Class 1.0 Mode commands and responses described
in this section are applicable when command +FCLASS=1.0 as shown in Table 6-1.
Mode Commands
Command: +FAA
Description:
Auto Answer Enable - Class 1.0
This command enables or disables fax adaptive answer. This command
operates identically to the +FAE command.
Defined Values:
<value> Decimal number corresponding to the selected option.
0 Disable data /fax auto answer mode. (Default.)
1 Enable data /fax auto answer mode. The modem determines the calling
type and issues DATA result code (13) if the caller is a data modem or issues
FAX result code (15) if the caller is a fax modem.
Command: +FAE
Description:
Auto Answer Enable - Class 1 and 1.0
This command enables or disables fax adaptive answer. This command
operates identically to the +FAA command.
Defined Values:
<value> Decimal number corresponding to the selected option.
0 Disable data /fax auto answer mode. (Default.)
1 Enable data /fax auto answer mode. The modem determines the calling
type and issues DATA result code (13) if the caller is a data modem or issues
FAX result code (15) if the caller is a fax modem.
After a data (not fax) connection is achieved (indicated by the DATA result
code), the DTE must issue an ATO command to cause the modem to go on-
line.
Command: +FTS
Transmit Silence
Description:
This command causes the modem to terminate a transmission and wait for
<time> 10-ms intervals before responding with the OK result code.
<time> Decimal number from 0 (default) to 255 that specifies the length of
time in 10-ms intervals to delay before responding with the OK result code
after terminating the session.
Defined Values:
Result Codes:
OK Reported when transmission has been terminated for the specified
amount of time.
ERROR <value> is invalid or this command is issued while the modem is on-
hook.
Reporting Supported Range of Parameter Values:
Command: +FTS=?
Response: +FTS: <time> range
Example: +FTS: 0-255.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Command: +FRS
Receive Silence
Description:
This command causes the modem to listen and report an OK result code
when silence has been detected on the line for the specified period of time.
This command will terminate when the required period of silence is detected
or when the DTE sends the modem another character other than XON or
XOFF, which is discarded. In either event, the OK result code is returned.
This command is aborted if any character is received from the DTE after
receipt of the command but before the time delay elapses. In this case, the
modem discards the aborting character and issues an OK result code.
<time> Decimal number from 0 (default) to 255 which specifies the length of
time in 10-ms intervals to delay before responding with the OK result code
after detecting silence on the line.
Defined Values:
Result Codes:
OK Reported when silence has been present on the line for the specified
amount of time or when the DTE sends the modem a character other than
XON or XOFF.
ERROR <value> is invalid or this command is issued while the modem is on-
hook.
Reporting Supported Range of Parameter Values:
Command: +FRS=?
Response: +FRS: <time> range
Example: +FRS: 0-255
Command: +FTM
Description:
Transmit Facsimile
This command causes the modem to transmit data using the modulation
defined below. When a valid <mod> value is entered, the modem transmits
the proper training sequence in the selected mode, followed by constant 1 bits
until data is received from the DTE. The modem also returns the CONNECT
result code at the beginning of the training sequence.
Defined Values:
<mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 6-2.
Table 6-2. Fax Class 1 and Fax Class 1.0 Modulation Modes and Rates
<mod>
3
Modulation
V.21
Training
Modulation Mode and Rate
300 bps
24
48
72
V.27 ter
V.27 ter
V.29
2400 bps
4800 bps
7200 bps
73
74
96
V.17
V.17
V.29
Long
Short
7200 bps long
7200 bps short
9600 bps
97
98
121
122
145
146
V.17
V.17
V.17
V.17
V.17
V.17
Long
Short
Long
Short
Long
Short
9600 bps long
9600 bps short
12000 bps long
12000 bps short
14400 bps long
14400 bps short
Result Codes:
CONNECT Reported when the modems begins the training sequence after
receipt of a valid <mod> value.
ERROR If the modem’s transmit buffer becomes empty and the last
transmitted character is NUL (00), the modem continues to transmit NULs
until the DTE sends more data or five seconds elapses. After five seconds
elapse with an empty transmit buffer, the modem will turn off the transmit
carrier, return to the command state, and report the ERROR result code.
OK If the modem’s transmit buffer becomes empty and the last transmitted
character is not NUL, the modem will turn off the transmit carrier, return to the
command state, and report the OK result code.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Reporting Current or Selected Values:
Command: +FTM?
Response: +FTM: <mod>
Example: +FTM: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FTM=?
Response: +FTM: (<mod> range)
Example: +FTM: 3,24,48,72,73,74,96,97,98,121,122,145,146
Command: +FRM
Description:
Receive Facsimile
This command causes the modem to enter the receiver mode using the
modulation defined below.
Defined Values:
<mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 6-2.
Reporting Current or Selected Values:
Command: +FRM?
Response: +FRM: <mod>
Example: +FRM: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FRM=?
Response: +FRM: (<mod> range)
Example: +FRM: 3,24,48,72,73,74,96,97,98,121,122,145,146
CONNECT Reported when the selected carrier is detected.
+FCERROR Reported if another carrier is detected and FAR=0; the modem
then returns to the command state.
Result Codes:
NO CARRIER Reported if loss-of-carrier is detected.
OK Reported if the DTE sends any character to the modem other than XON or
XOFF while operating in configured flow control from the DTE; the modem
then returns to the command state.
Command: FTH
Description:
Transmit Data with HDLC Framing
This command causes the modem to transmit data using HDLC protocol and
the modulation defined below.
Defined Values:
Result Codes:
<mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 6-2.
CONNECT Reported for either of two conditions:
1. At the beginning of transmission of the training pattern for the selected
modulation.
2. If the Final Frame bit is 0.
OK Reported for either of two conditions:
1. If the Final Frame Bit is 1.
2. if the DTE sends only <DLE><ETX> (a null frame) while transmitting flags.
ERROR Reported if five seconds elapse from the time when the modem
reported the CONNECT result code without any additional data transmitted
from the DTE; the modem then turns off carrier and returns to the command
mode.
Reporting Current or Selected Values:
Command: +FTH?
Response: +FTH: <mod>
Example: +FTH: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FTH?
Response: +FTH?
Example: +FTH: 98 For V.17 9600 bps.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Command: +FRH
Description:
Receive Data with HDLC Framing
This command causes the modem to receive frames using HDLC protocol
and the modulation defined below. An ERROR response code results if this
command is issued while the modem is on-hook.
Defined Values:
<mod> Decimal number corresponding to the selected modulation mode and
data rates shown in Table 6-2.
Reporting Current or Selected Values:
Command: +FRH?
Response: +FRH: <mod>
Example: +FRH: 98 For V.17 9600 bps.
Reporting Supported Range of Parameter Values:
Command: +FRH?
Response: +FRH?
Example: +FRH: 98 For V.17 9600 bps.
Result Codes:
CONNECT Reported for either of two conditions:
1. When the selected carrier is detected with an HDLC flag.
2. If the DTE sends another +FTH=<MOD> command after sending the result
code indicating frame reception is complete.
+FCERROR Reported if a different carrier is detected and FAR=0.
NO CARRIER Reported if loss of carrier is detected.
OK Reported for either of two conditions:
1. If a frame was received correctly.
2. If the DTE sends any character other than XON or XOFF while the modem
is in the configured flow control.
ERROR Reported if a frame was received in error.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Service Class 1 Commands
Command: +FAR
Description:
Adaptive Reception Control
If Adaptive Reception is enabled, the modem adaptively detects the selected
message carrier or V.21 control messages. If the expected carrier is detected,
the modem operates as specified in the respective +FRM=<mod or
+FRH=<mod commands. If V.21 flag preamble is detected instead, the
modem issues a +FRH:3 intermediate result code, and then executes an
implied +FRH=3 command.
Defined Values:
<value> Decimal number corresponding to the selected option.
0 Disable Adaptive Reception. (Default.)
1 Enable Adaptive Reception.
Reporting Current or Selected Values:
Command: +FAR?
Response: +FAR: <value
Example: +FAR: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +FAR=?
Response: +FAR: (<value> range )
Example: +FAR: (0,1)
Command: +FCL
Description:
Carrier Loss Timeout
This parameter allows the DTE to select the modem’s loss-of-carrier delay
between initial loss-of-carrier and qualified loss-of-carrier, when the modem
will give up and exit a receive mode. Intermediate (less than FCL timeout)
loss-of-carrier should be indicated by insertion of the SQ-BAD signal quality
indicator in the received data stream.
In unframed receive modes, if the modem detects RTC as described in
Recommendation T.30 prior to initial loss of the high speed carrier, or if the
modem detects V.21 carrier after initial loss of high speed carrier, then the
modem immediately accepts the loss-of-carrier as qualified, without waiting for
the FCL timer to expire.
In HDLC receive modes, if the modem detects HDLC abort prior to initial loss
of the high speed carrier, or if the modem detects V.21 carrier after initial loss
of high speed carrier, then the modem l immediately accepts the loss-of-
carrier as qualified, without waiting for the FCL timer to expire.
<value> Decimal number representing the loss-of-carrier delay time in units of
100 ms. The range is 0 - 255.
Defined Values:
Reporting Current or Selected Values:
Command: +FCL?
Response: +FCL: <time
Example: +FCS: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +FCL=?
Response: +FCL: (time range)
Example: +FCL: (0-255)
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Command: +FDD
Double Escape Character Replacement
Description:
This parameter conditions the use of the ˜DLE˜˜˜SUB˜ pair to encode
consecutive <1/0 €<1/0 in data. This may be used to prevent unbound
expansion of data that contains many <1/0 patterns.
<value> Decimal number corresponding to the selected option. For modem
decode of <DLE><SUB>, the defined range are:
Defined Values:
0 <DLE> <DLE> or discard (default and only)
1 <DLE> <DLE> (not supported)
For modem encoding of <1/0> <1/0>the defined values are:
0 <DLE> <DLE> <DLE> <DLE> (default and only)
1 <DLE> <SUB> (not supported)
Reporting Current or Selected Values:
Command: +FDD?
Response: +FDD: <value>
Example: +FDD: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +FDD=?
Response: +FDD: (<value> range)
Example: +FDD: (0)
Command: +FIT
Description:
DTE Inactivity Timeout
This command specifies a DTE inactivity timeout value that allows the modem
to break away from an unsuccessful connection attempt at any stage of a
facsimile transfer. The DTE inactivity timer operates only while the modem is
off-hook.
Defined Values:
<time The <time parameter indicates the DTE inactivity timeout in seconds.
The value of 0 indicates that timeout is disabled (default). The required
timeout range is 1 to 255 seconds. The inactivity timer starts when the modem
has taken some action that requires DTE response. If the DTE does respond,
the modem resets the inactivity timer. Inactivity timer related events are listed
in Table 6-3.
<action The <action parameter has two meanings.
0 Upon timeout, the modem will go on-hook, executing an implied ATH
command; then reset to +FCLASS 0.
1 Upon timeout, the DCE will only go on-hook.
Reporting Current or Selected Values:
Command: +FIT?
Response: +FIT: <time ,action
Example: +FIT: 0,0 For the default settings.
Reporting Supported Range of Parameter Values:
Command: +FIT?
Response: +FIT: (<time> range), (<action> range)
Example: +FIT: (0-255),(0-1)
Table 6-3. Inactivity Timer Start and Stop Events
On-line state
Waiting for a command
Waiting for transmit data
Start timer event
Stop timer event
DTE sends AT or “at”
DTE sends data
modem sends final result code
modem sends CONNECT after +FTM or
+FTH command
Waiting for transmit data
modem sends <XON or sets CTS ON
DTE sends data
Waiting to deliver received data modem sends <XOFF after +FRM or +FRH
DTE sends <XON
command
Waiting to deliver received data DTE sets V.24 Ckt 133 OFF after +FRM or
+FRH command
DTE sets V.24 Ckt 133
ON
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Command: +FPR
Description:
Fixed DTE Rate
This numeric extended-format parameter specifies the data rate at which the
modem will accept commands during on-line operation. It may be used to
select operation at rates at which the modem is not capable of automatically
detecting the data rate being used by the DTE. Specifying a value of 0
disables the function and allows operation only at rates automatically
detectable by the modem. The specified rate takes effect following the
issuance of any result code(s) associated with the current command line.
The <rate> specified does not apply in Online Data State if Normal Mode
(Direct Mode) of operation is selected.
Syntax:
+FPR=<rate code>
Defined Values:
<rate code> Specifies the DTE-modem interface operation rate in bits/s with a
rate code. The available rate codes are:
0 Automatic detection (default)
1 2400 bits/s (executes +IPR=2400)
2 4800 bits/s (executes +IPR=4800)
4 9600 bits/s (executes +IPR=9600)
8 19200 bits/s (executes +IPR=19200)
10 38400 bits/s (executes +IPR=38400)
18 57400 bits/s (executes +IPR=57400)
If unspecified or set to 0, automatic detection is selected and the character
format is also forced to autodetect, +ICF=0.
If the rate specified is not supported by the modem, an ERROR result code
will be returned.
Reporting Current or Selected Values:
Command: +FPR?
Response: <rate code>
Example 1: 0 For automatic rate detection.
Example 2: 18 For 57600 bits/s.
Reporting Supported Range of Parameter Values:
Command: +FPR=?
Response: (<rate code> range)
Example: (0,1,2,4,8,10,18)
Command: +FMI?
Description
Request Manufacturer Identification
This command causes the modem to report the modem product manufacturer.
Syntax:
Typical Response:
+FMI?
Multi-Tech
OK
Command: +FMM? Request Model Identification
Description:
Syntax:
Typical Response:
This command causes the modem to report the modem product model.
+FMM?
V90
OK
Command: +FMR? Request Revision Identification
Description:
This command causes the modem to transmit one or more lines of information
text identifying the modem version, revision level, or date.
Syntax:
+FMR?
Typical Response:
V3.001-V90_2M_DLS
OK
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Command: +FLO
Description:
Flow Control
This parameter allows the DTE to identify and select the type of flow control
used.
Syntax:
+FLO=<method>
Defined Values:
<method> Decimal number corresponding to the selected option.
0 XON/XOFF and RTS/CTS flow control turned off.
1 Use XON/XOFF flow control in either direction.
2 Use RTS for flow control of the modem by the DTE; use CTS for flow control
of the DTE by the modem.
Reporting Current or Selected Values:
Command: +FLO?
Response: +FLO: <method>
Example: +FLO: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +FLO=?
Response: +FLO: (<method>range)
Example: +FLO: (0-2)
OK <method> = 0-2.
Result Codes:
ERROR Otherwise.
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Examples
Examples of calling (transmitting) and answering (receiving) one page using Fax Class 1 commands are shown in
Table 6-4 and Table 6-5, respectively. The examples show the interchange between the DTE and the modem for
various cases. Comments are included to explain how to handle various situations. Commands and responses are in
upper case and comments are in lower case. All streams of data denoted by <..frame> are terminated by the
<DLE><ETX> characters.
Table 6-4. Fax Class 1 Calling Sequence (Transmitting a Single Page)
DTE Commands
AT+FCLASS=1
ATDT<string>
Modem Responses
OK
Local Modem Action
Set Class 1
Dial and send CNG
Look for V.21
Detect flags
Remote Station Action
Notes
Answer
send CED, V.21
Send HDLC flags
AT+FRH=3
implied by dialing with
+FCLASS=1.0
CONNECT
<NSF frame>
<DLE><ETX>
OK
Send NSF frame
AT+FRH=3
AT+FRH=3
CONNECT
<CFI frame data>
<DLE><ETX>
OK
Detect flags
get CSI
get FCS
send CSI frame
check FCS
accept FCS
Frame status OK
CONNECT
<DIS frame data>
<DLE><ETX>
OK
Detect flags
get DIS
get FCS
accept FCS
detect loss-of-carrier
send V.21 carrier
send flags
send TSI frame
send FCS
DTE must detect final
frame bit to anticipate
loss of carrier
send DIS frame
check FCS
drop carrier
detect carrier
detect flags
AT+FRH=3
AT+FRH=3
NO CARRIER
Final frame bit clear tells
the modem to expect
another frame.
Final frame bit set tells
the modem not to
CONNECT
get TSI frame
<TSI frame data>
<DLE><ETX>
CONNECT
send flags
send DCS frame
send FCS, flags
drop carrier
get DCS frame
expect another frame
<DCS frame data>
<DLE><ETX>
OK
AT+FTS=8;
+FTM=96
wait 80 ms
send V.29 carrier
CONNECT
detect carrier
get TCF data
<TCF data pattern>
<DLE><ETX>
send TCF data
drop carrier
OK
AT+FRH=3
detect carrier
detect flags
get CFR frame
check FCS
send V.21 carrier
send flags
get CRF frame
send FCS
CONNECT
<CFR frame data>
<DLE><ETX>
OK
Final frame bit set.
frame OK
accept FCS
AT+FRH=3
NO CARRIER
CONNECT
detect loss-of-carrier
drop carrier
AT+FTM=96
<page image data>
<DLE><ETX>
send V.29 carrier
send page data
drop carrier
detect carrier
receive page
OK
AT+FTS=8;
+FRH=3
wait 80 ms
send V.21 carrier
send flags
send EOP frame
send FCS
drop carrier
detect carrier
detect flags
receives EOP
CONNECT
OK
<EOP frame data>
<DLE><ETX>
final frame
AT+FRH=3
detect carrier
detect flags
get MCF frame
check FCS
send V.21 carrier
send flags
get MCF frame
send FCS
CONNECT
<MCF frame data>
<DLE><ETX>
OK
Final frame bit set.
frame OK
accept FCS
AT+FRH=3
NO CARRIER
detect loss-of-carrier
drop carrier
AT+FRH=3
<DNC frame>
send V.21 carrier
send flags
send DNC frame
send FCS
drop carrier
hang up
CONNECT
detect carrier
detect flags
receive DC|NC
<DLE><ETX>
ATH0
OK
OK
final frame
hang up
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Chapter 6 – Fax Class 1 and Class 1.0 Commands
Table 6-5. Fax Class 1 Answering Sequence (Receiving a Single Page)
DTE Commands
Modem Responses
Local Modem Action
Remote Station Action
Notes
AT+FCLASS=1
OK
Set Class 1
RING<-
detect ringing
dials [,send CNG]
ATA
off-hook,
AT+FRH=3
send CED,
send V.21 carrier
send flags
send CSI frame
send FCS
send flags
implied by answering
with +FCLASS=1.0.
not final frame
get CED,
detect carrier
detect flags
receive CSI
get FCS
CONNECT
CONNECT
<CSI frame data>
<DLE><ETX>
get flags
<DIS frame data>
<DLE><ETX>
send DIS data
send FCS and flags
drop carrier
get DIS
get flags
OK
final frame
AT+FRH=3
AT+FRH=3
detect carrier
detect flags
receive TSI
receive FCS
accept FCS
send V.21 carrier
send flags
send TSI frame
send FCS
CONNECT
<TSI frame data>
<DLE><ETX>
OK
frame OK
CONNECT
<DCS frame data>
<DLE><ETX>
OK
receive DCS
receive FCS
accept FCS
send DCS frame
send FCS
final frame bit set
frame OK
AT+FRH=3
NO CARRIER
detect loss-of-carrier
drop carrier
DTE did not check final
frame bit and issued
+FRH=3
AT+FTM=96
wait 75 ms
CONNECT
<TCF data>
<DLE><ETX>
OK
detect carrier
receive TCF
detect loss-of-carrier
send V.29 carrier
send TCF data
drop carrier
AT+FRH=3
send V.21 carrier
send flags
get CRF frame
send FCS
detect carrier
detect flags
receive CFR
CONNECT
<CFR frame data>
<DLE><ETX>
drop carrier
OK
final frame
AT+FTM=96
CONNECT
detect carrier
receive page
detect loss-of-carrier
send V.29 carrier
send page data
drop carrier
<page image data>
<DLE><ETX>
NO CARRIER
wait 75 ms
send V.21 carrier
send flags
send EOP frame
send FCS
CONNECT
detect carrier
detect flags
receive EOP
receive FCS
accept FCS
<EOP frame data>
<DLE><ETX>
NO CARRIER
frame OK
AT+FRH=3
AT+FRH=3
NO CARRIER
CONNECT
detect loss-of-carrier
drop carrier
send V.21 carrier
send flags
detect carrier
detect flags
<MCFame data>
<DLE><ETX>
get MCF frame
send FCS
receive MCF frame
accept FCS
OK
final frame
AT+FRH=3
detect carrier
detect flags
receive DCN
receive FCS
accept FCS
send V.21 carrier
send flags
send DCN frame
send FCS
CONNECT
<DCN frame data>
<DLE><ETX>
OK
frame OK
AT+FRH=3
ATH0
NO CARRIER
OK
detect loss-of-carrier
hang up
drop carrier
end of session
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Chapter 7 – Voice Commands
Chapter 7 – Voice Commands
Voice Commands Overview
Voice commands are identified in Table 7-1.
Table 7-1. Voice Commands
Command
Function
Configuration
Set Mode
Caller ID (CID)
Automatic Hang-up control
Manufacturer Identification
Product Identification
Version, Revision, etc.
Flow Control
+FCLASS
+VCID
+VNH
+FMI?
+FMM?
+FMR?
+FLO
Voice
+VIP
Voice Initialize All Parameters
Start modem Receive (Record)
Voice Tone Send (Send single frequency or DTMF)
Start modem Transmit (Playback)
Voice Gain Receive (Record Gain)
Voice Gain Transmit (Playback Volume)
Voice Inactivity Timer (DTE/Modem)
Analog Source/Destination Selection
Ringback Goes Away Timer
Ringback Never Appeared Timer
Silence Detection (QUIET & SILENCE)
Compression Method Selection
Beep Tone Duration Timer
+VRX
+VTS
+VTX
+VGR
+VGT
+VIT
+VLS
+VRA
+VRN
+VSD
+VSM
+VTD
+VDR
+VDT
+VPR
Distinctive Ring
Control Tone Cadence Reporting
Select DTE/modem Interface Rate (Turn off autobaud)
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Chapter 7 – Voice Commands
<DLE> Shielded Event Codes Sent to the DTE
Table7-2 lists the supported <DLE> shielded codes sent to the DTE in the expression <DLE><code>. The
number in parenthesis in the second column corresponds to the T.50 equivalent.
Table 7-2. Supported <DLE> Shielded Codes Sent to the DTE
Code
T.50 Equivalent
Event Report Description
<DLE>
(1/0)
Two contiguous <DLE><DLE> codes indicate a single <DLE> in the
data stream
<SUB>
<ETX>
(1/10)
(0/3)
(5/8)
(2/14)
(2/15)
(7/15)
(5/2)
(3/1)
(3/2)
(3/3)
(3/4)
(3/5)
(3/6)
(3/7)
(3/8)
(3/9)
(3/0)
(4/1)
(4/2)
(4/3)
(4/4)
(2/10)
(2/3)
(6/15)
(6/3)
(6/5)
(6/8)
(4/8)
(7/3)
(7/1)
(4/10)
(6/12)
(7/2)
(6/2)
(6/4)
(7/5)
(7/0)
(5/0)
(6/1)
(6/6)
<DLE><DLE> in the data stream
End Data State
Packet Header for the “Complex Event Detection Report”
Packet Terminator for the “Complex Event Detection Report”
Start of DTMF tone shielding
DTMF transitions to off
Ring
DTMF 1
DTMF 2
DTMF 3
DTMF 4
DTMF 5
DTMF 6
DTMF 7
DTMF 8
DTMF 9
DTMF 0
Extended Keypad DTMF A
Extended Keypad DTMF B
Extended Keypad DTMF C
Extended Keypad DTMF D
Extended Keypad DTMF E
Extended Keypad DTMF F
Receive Buffer Overrun
Facsimile Calling
X
.
/
~
R
1
2
3
4
5
6
7
8
9
0
A
B
C
D
*
#
o
c
e
h
H
s
q
J
l
Data Calling
Line Current Break (local phone goes on-hook)
Line Current Detected (local phone goes off-hook)
“Presumed Hangup”(SILENCE) Time-out
“Presumed End of Message” (QUIET) Time-out
SIT Signal
Loop Current Interruption
Ringing Tone
BUSY
r
b
d
u
p
P
a
f
DIAL TONE
Transmit Buffer Underrun
Line voltage increase
Line voltage decrease (extension pickup)
Facsimile or Data Answer
Data Answer
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Chapter 7 – Voice Commands
<DLE> Shielded Codes Sent to the Modem (DCE)
Table 7-3 lists the supported <DLE> shielded codes sent to the modem in the expression <DLE><code>.
The number in parenthesis in the second column corresponds to the T.50 equivalent.
Table 7-3. Supported <DLE> Shielded Codes Sent to the Modem (DCE)
Code
<DLE>
Code
(1/0)
Simple Action Command Description
Two contiguous <DLE><DLE> codes indicate a single <DLE>
in the data stream ("Immediate Command" or "Stream
Command")
u
d
(7/5)
(6/4)
[Action Numbers 0 and 3] Increase the volume or gain by one
unit ("Immediate Command")
[Action Numbers 1 and 4] Decrease the volume or gain by one
unit ("Immediate Command")
p
r
(7/0)
(7/2)
(0/3)
[Action Number 9] Pause
[Action Number 10] Resume
[Action Number 11] End voice Transmit State ("Stream
Command")
<ETX>
<CAN>
!
(1/8)
(2/1)
[Action Number 12] Clear transmit buffer of voice data
("Immediate Command")
[Action Number 15] Receive abort ("Immediate Command")
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Chapter 7 – Voice Commands
Voice Configuration Commands
Command: +FCLASS=8 Select Voice Mode
+FCLASS=8 selects the Voice Mode. The Voice Mode commands and
responses described in this section are applicable when command
+FCLASS=8. (See the Generic Modem Control section for the
definition of the FCLASS command.)
Command: +VNH
Automatic Hang-up Control
This command enables or disables automatic hangups.
+VNH=<hook>
Syntax:
Defined Values:
<hook> Decimal number corresponds to the selected option (Table 6-4).
0 The modem enables automatic hangups as is normal in other modes.
1 The modem disables automatic hangups usually found in the other
non-Voice Modes.
2 The modem disables automatic hangups in the other non-Voice
Modes. The modem performs only a “logical” hangup (returns to OK
result code).
Table 7-4. +VNH Command Behavior
Command Response
Command
No Carrier
ATH
ATZ
DTR & D2
Present
+VNH=0
+VNH=1
+VNH=2
Notes:
Y
N
N
Y
Y
N
Y
Y
N
Y
Y
Y
Y= will hang-up; N= will not hang-up.
How +VNH is reset:
DTE uses +VNH command to change setting.
DTE issues another +FCLASS mode change without issuing another +VNH.
A hang-up event occurs (see this table).
DTE issues +VIP command.
Reporting Current or Selected Values:
Command: +VNH?
Response: <hook>
Example: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VNH=?
Response: (<hook> range)
Example: (0-2)
Result Codes:
OK <hook> = 0-2.
ERROR Otherwise.
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Chapter 7 – Voice Commands
Basic Voice Commands
Command: +VIP
Description:
Voice Initialize All Parameters
his command causes the modem to initialize all voice parameters to their
default values.
Syntax:
+VIP
Result Code:
OK
ERROR If not in Voice Mode.
Command: +VRX
Description:
Start Modem Receive (Record):
This command causes the modem to start the voice reception process.
Syntax:
+VRX
Result Codes:
OK
ERROR If not in Voice Mode.
Command: +VTS
Description:
Send Voice Tone(s)
This command causes the modem to send DTMF digit or hookflash tones with
the duration specified by +VTD, to send DTMF digit or hookflash tones with
duration specified by this command, or to send single or dual tone frequencies
with duration specified with this command.
Syntax:
+VTS=<string>
Defined Values: <string> The tone generation consists of elements in a list where each element is
separated by a comma. Each element can be:
1. A single character which the modem interprets as a DTMF digit (0 - 9, #, *,
or A-D) or hookflash (!), with a duration given by the +VTD command.
2. A 3-element string enclosed in square brackets, "[freq1,freq2,dur]", which
the modem interprets as a general dual tone and duration selection, or
3. A 2-element string enclosed in curly braces, "{X,dur}", which the modem
interprets as a DTMF digit (0 - 9, #, *, or A-D), or hookflash (!) with a duration
(dur) different than that given by the +VTD command.
Missing subparameters assume the default value. Unspecified values always
default to zero for frequencies, DTMF * for DTMF tones, and +VTD for
duration. The omission of commas (and associated subparameters) is valid.
The quantity in the square brackets consists of a 3-element list
(freq1,freq2,dur), which can be used to send single or dual tones. The first
element is the first frequency (freq1) with range 0 or 200-3000 Hz. The
second element is the second frequency (freq2), with range 0 or 200-3000 Hz.
The third element is the duration (dur) in 0.01 second intervals with range 0-
255 (ASCII units of 10 ms). A list may contain null elements. For example
[3000] means that the DCE generates a single tone at 3000 Hz for the default
duration, [3000,3300] means that the DCE generates a dual tone at 3000 and
3300 Hz for the default duration, and [,3300] means that the DCE generates a
single tone at 3300 Hz for the default duration.
The quantity in the curly braces consists of a 2-element list (X,dur), which can
be used to send DTMF tones or hookflash. The first element is the DTMF tone
or hookflash (!) character (X), and the second element is the duration (dur) in
0.01 seconds. The characters are of the same set given above. A list may
contain null elements. For example, {2} means DTMF tone "2" for the default
duration, and {} means silence for the default duration.
The modem will stop the tone generation at the point in the string where the
modem detects a parsing error, encounters an invalid frequency range,
encounters a <CR>, or encounters a semi-colon.
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Chapter 7 – Voice Commands
Reporting Supported Range of Parameter Values:
Command: +VTS=?
Response: (<freq1> range), (<freq2> range), (<dur> range)
Example: (200-3000),(200-3000),(0-255)
OK
Result Codes:
OK Valid command.
ERROR The <string> command is invalid, or a selected frequency is out of range.
This example illustrates tone generation without using any null elements.
The command example is followed by a description of command execution.
AT+VTS= {!,30},1,2,[1000,1300,50],!,{*,6},[800,1300,50],9
1. Hookflash with a duration of 300 ms.
Example 1.
2. Play DTMF 1 with duration given by the +VTD command.
3. Play DTMF 2 with duration given by the +VTD command.
4. Play tone pair at 1 000 Hz and 1 300 Hz with a duration of 500 ms.
5. Hookflash with duration given by the +VTD command.
6. Play DTMF * with duration of 60 ms.
7. Play tone pair at 800 Hz and 1300 Hz with duration of 500 ms.
8. Play DTMF 9 with duration given by the +VTD command.
This example illustrates tone generation using null elements. The command
example is followed by a description of command execution.
AT+VTS=1,2,[1000,1300,50],[800],9
1. Play DTMF 1 with duration given by the +VTD command.
2. Play DTMF 2 with duration given by the +VTD command.
3. Play tone pair at 1000 Hz and 1300 Hz with a duration of 500 ms.
4. Play tone pair at 800 Hz with duration given by the +VTD command.
5. Play DTMF 9 with duration given by the +VTD command.
This example illustrates tone generation using null elements and periods of
silence. The command example is followed by a description of command execution.
AT+VTS=1,[,,50],2,[],9
Example 2.
Example 3.
1. Play DTMF 1 with duration given by the +VTD command.
2. Play silence with duration of 500 ms.
3. Play DTMF 2 with duration given by the +VTD command.
4. Play silence with duration given by the +VTD command.
5. Play DTMF 9 with duration given by the +VTD command.
Command: +VTX
Description:
Syntax:
Start Modem Transmit (Playback)
This command causes the modem to start the voice transmission process.
+VTX
Result Codes:
CONNECT The modem accepts the command.
ERROR The modem is not connected to at least one off-hook telephone line
or one non-telephone line.
Command: +VGR Voice Gain Receive (Record Gain)
Description:
Syntax:
This command causes the modem to set the gain for received voice samples.
+VGR=<gain> 0 (only valid number) selects automatic gain control
Reporting Current or Selected Values:
Command: +VGR?
Response: <gain>
Example: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VGR=?
Response: <gain> range
Example: 0
Result Codes:
OK <gain> = 0.
ERROR Otherwise, or if not in Voice Mode.
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Chapter 7 – Voice Commands
Command: +VGT Voice Gain Transmit (Playback Volume)
Description:
Syntax:
This command causes the modem to set the volume level.
+VGT=<level>
Defined Values:
<level> Decimal number corresponding to the volume level.
Reporting Current or Selected Values:
Command: +VGT?
Response: <level>
Example: 128 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VGT=?
Response: <level> range
Example: 0-255
Result Codes:
OK <level> = 0-255.
ERROR Otherwise, or if not in Voice Mode.
Command: +VIT
Description:
Voice Inactivity Timer (DTE/Modem)
This command sets the modem’s initial value for the DTE/modem inactivity
timer.
Syntax:
+VIT=<timer>
Defined Values:
<timer> Decimal number corresponding to the time in units of 1.0 second.
A value of 0 disables the timer.
Reporting Current or Selected Values:
Command: +VIT?
Response: <timer>
Example: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VIT=?
Response: <timer> range
Example: 0-255
Result Codes:
OK <timer> = 0-255.
ERROR Otherwise, or if not in Voice Mode.
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Chapter 7 – Voice Commands
Command: +VLS
Description:
Analog Source/Destination Selection
This command causes the modem to select one or more source/destinations
of the analog data.
Syntax:
+VLS=<label>
Defined Values:
<label> Decimal number corresponding to the selected analog
source/destination hardware configuration (see Table 6-5).
Response: <label>
Example: 0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VLS=?
Response: <label>,<devices>,<transmit event>,<receive event>,<idle event>
Where each event subparameter is a hex number the represents an event bit
field of the reporting capabilities of each state. (See Table 6-6):
<label> Identifies the modem analog source/destination hardware
configuration.
<devices> A <string constant> made up of Primitives,
<xxxx event> <transmit event>, <receive event>, and <idle
event>subparameters are the DCE event reporting capabilities for the Voice
Transmit State, Voice Receive State, and the Voice Command State,
respectively. Each of the event reporting subparameters is a hex number that
represents an event bit field. The hex number format is defined in Table 6-6);
a one in the bit field indicates that the DCE can report the associated event.
Each of the possible hardware configurations has its own <label>, ..., <idle
event> description line (the above form description shows just one). A
<CR><LF> terminates each description line.
Example: AT+VLS=?
0,"",B0804100,B0804100,B0804100
1,"T",0B8433C1,0FE431C1,0B8431C1
2,"L",08800300,0CE00100,08800100
3,"LT",0B8433C1,0FE431C1,0B8431C1
4,"S",00800300,04E00100,20800100
5,"ST",0B8433C1,0FE431C1,0B8431C1
8,"S1",00800300, 04E00100,20800100
9,"S1T",0B8433C1,0FE431C1,0B8431C1
11,"M1",00800300,04E00100,20800100
14,"H",00800300,04E00100,20800100
18,"M1S",00800300,04E00100,20800100
19,"M1S1",00800300,04E00100,20800100
OK <label> = 0-5,8-9,11,14,18-19.
ERROR The <label> value is out of range, or if the modem cannot service the
request in the <label> subparameter.
Result Codes:
Table 7-5. +VLS Command Options
Label Primitives
Description
+VTX
+VRX
+VSP=1
0
1
None
T
DCE on-hook. Local phone connected to the line.
DCE off-hook. DCE connected to the line. Local phone
provided with power to detect hook condition.
DCE on-hook. Local phone connected to the DCE.
DCE off-hook. Local phone connected to the line. DCE
connected to the line.
X
X
2
3
L
LT
X
X
X
X
4
5
S
Internal Speaker connected to the DCE. DCE on-hook.
Local phone connected to the line.
Internal Speaker connected to the line. DCE off-hook. DCE
connected to the line. Local phone provided with power to
detect hook condition.
Internal Microphone connected to the DCE. DCE on-hook.
Local phone connected to the line.
Internal Microphone and Internal Speaker connected to the
line. DCE off-hook. DCE connected to the line. Local phone
provided with power to detect hook condition.
External Speaker connected to the DCE. DCE on-hook.
X
X
ST
X
X
6
7
M
MST
X
8
S1
X
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Chapter 7 – Voice Commands
Label Primitives
Description
+VTX
+VRX
+VSP=1
Local phone connected to the line.
9
S1T
External Speaker connected to the line. DCE off-hook. DCE
connected to the line. Local phone provided with power to
detect hook condition.
X
X
10
MS1T
Internal microphone and External Speaker connected to the
line. DCE off-hook. DCE connected to the line. Local phone
provided with power to detect hook condition.
External Microphone connected to the DCE. DCE on-hook.
Local phone connected to the line.
External Microphone and Internal Speaker connected to the
line. DCE off-hook. DCE connected to the line. Local phone
provided with power to detect hook condition.
External Microphone and External Speaker connected to the
line. DCE off-hook. DCE connected to the line. Local phone
provided with power to detect hook condition.
External Microphone and Speaker combination (handset or
headset) connected to the DCE. DCE on-hook. Local phone
connected to the line.
X
11
12
M1
X
M1ST
X
X
13
14
15
M1S1T
H
X
X
X
X
HT
External Microphone and Speaker combination (handset or
headset) connected to the line. DCE off-hook. DCE
connected to the line. Local phone provided with power to
detect hook condition.
16
17
18
19
MS
M1S
MS1
M1S1
MS Internal Microphone and Internal Speaker connected to
DCE.
MS1 Internal Microphone and External Speaker connected
to DCE.
External Microphone and Internal Speaker connected to
DCE.
External Microphone and External Speaker connected to
DCE.
Primitives (Column 2):
L Local Phone.
T Telephone Line.
M Internal Microphone.
M1 External Microphone.
S Internal Speaker.
S1 External Speaker.
H External Microphone and Speaker combination (handset or headset).
Note: All label options in this table may not be supported by the product; see +VLS command
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Chapter 7 – Voice Commands
Table 7-6. Events Detectable in the Voice Mode per V.253
Event Number Event Description
Event Reporting
0
1
2
3
Caller Id Report
DID Report
Distinctive Ringing
RING
Message
Message
Pattern
Simple
4
DTMF Received
Simple
5
6
7
8
Receive Buffer Overrun
Facsimile Calling (e.g., 1100 Hz)
Data Calling (e.g., 1300 Hz)
Local Phone On/Off-hook
Presumed Hangup (SILENCE) Time-out
Presumed End of Message (QUIET) Time-out
SIT Signal
Simple
Simple
Simple
Simple
Simple
Simple
Simple, Message
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple
Simple (note 1)
Simple
Simple
Simple
9
10
11
12
13
14
15
16
18
19
20
21
22
23
24
25
26
27
29
30
31
32
Legend:
Bong Tone
Loop Current Interruption
Loop Current Polarity Reversal
Call Waiting Beep/Interrupt
Distinctive Call Waiting
Ringing Tone
BUSY
DIAL TONE
Reorder/Fast Busy
V.21 Channel 2 7E flags
Transmit Buffer Underrun
Extension Phone On/Off-hook
Facsimile or Data Answer (e.g., 2100 Hz)
Data Answer (e.g., 2225 Hz)
Voice Detect
Stuttered Dial tone
Invalid Voice Data Format
Lost Data Detected Event
Facsimile Answer
This table lists events without any regard as to whether the DCE reporting of the event is
optional or mandatory, and without assigning a DCE reporting mechanism.
The first column lists the event number assignment for each event. The event number also
serves another purpose; each number is a bit position in a bit field. Event number 0 is the
most significant bit of the left most hex number in a hex representation (V.253 defines a
total of eight hex digits). The final bit in the bit field occupies the least significant bit position
of the right-most hex number. The bit representations of the event numbers are used in the
+VLS= command.
The third column lists whether a single character is enough to report the event, or if the
DCE must supply a more complicated report. The description Simple indicates a single
character response (<DLE> shielded), Message indicates a full text message (<DLE><X>
packet), and Pattern indicates a repeating Message.
Notes:
1. The use of complex event reporting for Stuttered Dial tone is for further study.
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Chapter 7 – Voice Commands
Command: +VRA Ringback Goes Away Timer
Description:
This command sets the length of time the modem will wait between ringbacks
during call origination before the modem can assume that the remote station
has gone off-hook.
Syntax:
+VRA=<interval>
Defined Values:
<interval> Decimal number (0-255) specifying the silence interval time in units
of 0.10 second between the end of one ring interval and the start of the next
ring interval. A value of 0 forces the modem to report the OK result code
immediately after the first Ringback. The range is 0.1 to 25.5 seconds for
<interval> = 1 to 255.
Reporting Current or Selected Values:
Command: +VRA?
Response: <interval>
Example: 50 (5 seconds) For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VRA=?
Response: (<interval> range)
Example: (0-255) 255 = 25.5 sec
OK <interval> = 0-255
Result Codes:
ERROR Otherwise, or if not in Voice Mode.
Command: +VRN Ringback Never Appeared Timer
Description:
This command sets the length of time the modem will wait between ringbacks
during call origination before the modem can assume that the remote station
has gone off-hook.
Syntax:
+VRN=<interval>
Defined Values:
<interval> Decimal number specifying the time period, in units of 1.0 second,
that the modem will wait for Ringback during call origination. A value of 0
forces the modem to report the OK result code immediately after dialing. The
range is 1 to 25 seconds for <interval> = 1 to 25.
Reporting Current or Selected Values:
Command: +VRN?
Response: <interval>
Example: 10 (10 seconds) For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VRN=?
Response: (<interval> range)
Example: (0-25)
Result Codes:
OK <interval> = 0-25
ERROR Otherwise, or if not in Voice Mode.
Command: +VSD Silence Detection (Quiet and Silence)
Description:
This command causes the modem to set the silence detection sensitivity and
the required period of silence before the modem reports silence detected at
the end of a voice receive either with the “Presumed End of Message” (QUIT)
or “Presumed Hangup (SILENCE) event reports.
Syntax:
+VSD=<sds>,<sdi>
Defined Values:
<sds> Decimal number corresponding to the selected parameter.
0 Use +VSM silence compression setting and algorithm for long-term silence
detection (if +VSM is in use) or proprietary silence compression setting and
algorithm for long-term silence detection (if +VSM is not in use).
127 Sets less aggressive long-term silence detection independent of
presence or use of silence compression.
128 Sets nominal long-term silence detection independent of presence or use
of silence compression.
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Chapter 7 – Voice Commands
129 Sets more aggressive long-term silence detection independent of
presence or use of silence compression.
<sdi> Decimal number specifying the required period of silence, in units of 0.1
second, before the modem can report silence detected at the end of a voice
receive either with the “Presumed End of Message” (QUIT) or “Presumed
Hangup (SILENCE) event reports. A value of 0 disables the modem silence
detection. The range is 0.1 to 25.5 seconds for <sdi> = 1 to 255.
Reporting Current or Selected Values:
Command: +VSD?
Response: <sds>,<sdi>
Example: 0,50 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VSD=?
Response: (<sds> range),(<sdi> range)
Example: (0,127-129),(0-255)
OK <hook> = 0 or 1.
Result Codes:
ERROR Otherwise, or if not in Voice Mode.
Command: +VSM Compression Method Selection
Description:
This command causes the modem to set the voice compression method, the
silence compression sensitivity, and the voice-sampling rate.
+VSM=<cml>,<vsr>,<sds>,<sel>
Syntax:
Defined Values:
<cml> Decimal number identifying the compression method.
<vsr> <range of values> containing the supported range of voice samples per
second of the analog signal.
<scs> <range of values> containing the supported range of sensitivity settings
for voice receives.
<sel> <range of values> containing the supported range of expansion values
for voice transmits.
Reporting Current or Selected Values:
Command: +VSM?
Response: <cml>,<vsr>,<sds>,<sel>
Example: 1,8000,0,0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VSM=?
Response: <cml>,<cmid>,<bps>,<tm>,<vsr>,<sds>,<sel>
<cml> Decimal number identifying the compression method (1, 129, 130, 140,
or 141).
<cmid> Alphanumeric string describing the compression method (UNSIGNED
PCM, IMA ADPCM, UNSIGNED PCM, 2 Bit ADPCM, or 4 Bit ADPCM).
<bps> Decimal number defining the average number of bits in the
compressed sample not including silence compression (2, 4 or 8).
<tm> Decimal number (0) reporting the time interval, in units of 0.1 second,
between timing marks. A 0 value reports that timing marks are not supported.
<vsr> <range of values> containing the supported range of voice samples per
second of the analog signal (8000).
<scs> <range of values> containing the supported range of sensitivity settings
for voice receives (0). A 0 indicates not supported.
<sel> <range of values> containing the supported range of expansion values
for voice transmits (0). A 0 indicates not supported.
Example: 1,"UNSIGNED PCM",8,0,8000,0,0
129,"IMA ADPCM",4,0,8000,0,0
130,"UNSIGNED PCM",8,0,8000,0,00
140,"2 Bit ADPCM",2,0,8000,0,0
141,"4 Bit ADPCM",4,0,8000,0,0
OK
Result Codes:
OK Valid range.
ERROR Otherwise, or if not in Voice Mode.
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Chapter 7 – Voice Commands
Command: +VTD
Description:
Beep Tone Duration Timer
This command causes the modem to set the default DTMF/tone generation
duration.
Syntax:
+VTD=<dur>
Defined Values:
<dur> Decimal number specifying the default DTMF/tone generation duration
in units of 0.01 second. A value of 0 specifies the value entered by the S11
parameter (50-255 ms). The range is 0.01 to 2.55 seconds for <dur> = 1 to
255.
Reporting Current or Selected Values:
Command: +VTD?
Response: <dur>
Example: 100 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VTD=?
Response: (<dur> range)
Example: (0-255)
Result Codes:
OK <dur>= 0-255.
ERROR Otherwise, or if not in Voice Mode.
Command: +VDR Distinctive Ring
Description:
This command causes the modem to enable or disable reporting of the ring
cadence information and to control the timing of the RING event code report if
ring cadence reporting is enabled.
Syntax:
+VDR=<enable>, <report>
Defined Values:
<enable> Decimal number corresponding to the selected option.
0 The modem will not report ring cadence information.
1 The modem will report ring cadence information as specified for the
<report> subparameter.
<report> Decimal number specifying ring cadence information report when
enabled by the <enable> subparameter.
0 The modem will produce only DROF and DRON messages. The modem will
not produce any RING event codes. The modem will report other call progress
event codes as normal.
Other The modem will produce only DROF and DRON messages. The
modem will produce a RING event code after <report>/10 seconds after the
falling edge of the ring pulse (i.e., after the DRON report).
Reporting Current or Selected Values:
Command: +VDR?
Response: <enable>,<report>
Example: 0,0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VDR=?
Response: (<enable> range),(<report>range)
Example: (0,1),(0-6)
Result Codes:
OK <enable>,<report> = (0,1),(0-6)
ERROR Otherwise, or if not in Voice Mode.
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Chapter 7 – Voice Commands
Command: +VDT
Description:
Control Tone Cadence Reporting
his command is included for compatibility only and has no effect other than
returning a result code.
This command allows the modem to enable or disable reporting of the control
tone cadence information in the frequency band used by the
Ringback/Remote Ring, BUSY, and reorder/Fast Busy tones (usually in the
300 to 600 Hz range).
Syntax:
+VDT=<enable>,<report>
Defined Values:
<enable> Decimal number corresponding to the selected option.
0 The modem will not produce any control tone cadence report.
<report> Decimal number specifying the produced any control tone cadence
report when enabled by the <enable> subparameter.
0 The modem will produce only CPOF and CPON messages.
Other Reserved.
Reporting Current or Selected Values:
Command: +VDT?
Response: <enable>,<report>
Example: 0,0 For the default setting.
Reporting Supported Range of Parameter Values:
Command: +VDT=?
Response: (<enable> range),(<report> range)
Example: (0),(0)
Result Codes:
OK <enable>,<report> = (0),(0)
ERROR Otherwise, or if not in Voice Mode.
Command: +VPR Select DTE/Modem Interface Rate (Turn Off Autobaud)
Description:
Syntax:
This command selects the DTE/modem interface rate.
+VPR=<rate>
Defined Values:
<rate>> Decimal number corresponding to the DTE/modem interface rate
where 0 = autobaud rate determined by processing the AT command, and
1,2,3,4,8,16,24,48,96 correspond to multipliers of 2400 bps to determine the
actual rate:
0 = Autobaud
1 = 2400 bps
2 = 4800 bps
3 = 7200 bps
4 = 9600 bps
8 = 19200 bps
16 = 38400 bps
24 = 57600 bps
48 = 115200 bps
96 = 230400 bps
Reporting Current or Selected Values:
Command: +VPR?
Response: <rate>
Example: 0 For the default setting (Autobaud).
Reporting Supported Range of Parameter Values:
Command: +VPR=?
Response: (<rate> range)
Example: (0,1,2,3,4,8,16,24,48,96)
OK <rate> = 0,1,2,3,4,8,16,24,48,96.
ERROR Otherwise, or if not in Voice Mode.
Result Codes:
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Chapter 8 – Setting Country Codes
Chapter 8 – Setting Country Codes
The Default Country Code is B5.
If You Want to Change the Country Code
1. View the List of Available Country Codes by executing the command AT+GCI=?<CR>
2. Set and save the country code by executing the command AT+GCI=nn<CR>
Note: nn is the country code.
3. OK is displayed.
4. The country code is then displayed (see the example below).
To Verify the Country Code
1. Type AT+GCI?<CR>, or you can
type ATI5<CR>
Example
1. Type the command AT+GCI=B5<CR>
2. Verify B5 was set by typing AT+GCI?<CR> or ATI5<CR>
3. B5 indicates the configuration is set for any B5 country such as Canada or the United
States, etc.
Country Codes Supported
The list below describes the country code settings for the countries that Multi-Tech currently supports.
Country
Argentina
Australia
Austria
Belgium
Canada
China
Cyprus
Czech Republic
Denmark
Finland
France
Germany
Greece
Hong Kong
Hungary
Iceland
Indonesia
Ireland
Country Code
07
09
Country
Philippines
Portugal
Slovak Republic
Spain
Sweden
Switzerland
Taiwan
United Kingdom
United States
Country Code
B5
FD
FD
FD
FD
FD
FE
FD
B5
FD
FD
B5
B5
FD
FD
FD
FD
FD
FD
FD
99
FD
FD
99
FD
FD
00
Italy
Japan
Korea
B5
FD
FD
B5
FD
7E
FD
Liechtenstein
Luxembourg
Mexico
Netherlands
New Zealand
Norway
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Appendix A – Mechanical Details
5V / 3.3V Jumper – JP6
The operating voltage factory default setting is 3.3V operation. The JP1 jumper must be set to 3.3-volt
operation.
Warning – Be sure to that 5V/3.3V jumper is set to match the requirements of your SocketModem. If this
jumper is set incorrectly, damage to the SocketModem and/or the Test/Demo card could result.
Caution – Use only the provided Multi-Tech Systems, Inc. transformer with the Test/Demo board. Use of
any other power source will void the warranty and will likely damage the Test/Demo board and the
SocketModem. The transformer connector is keyed to prevent improper connection to the Test/Demo
board.
Serial Test/Demo Board Block Diagram
Serial Test/Demo Board Block Diagram
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Appendix B - Safety/EMC Approvals,
Design Considerations, and
Regulatory Compliance
Approvals – Product Safety and EMC
Safety Certifications
UL 60950
EN 60950
CSA 950
AS 3260
CCC
EMC Approvals
FCC Part 15 (Class B)
Canada (Class B)
EN 55022 (Class B)
EN 55024
Telecom Certifications
We are continually working to extend this list. Please contact your Multi-Tech sales representative to
get an updated list. Telecom Certifications as of August 3, 2003.
Country
Country
Argentina
Australia
Austria
Belgium
Brazil
Korea
Liechtenstein
Luxembourg
Malaysia
Mexico
Canada
Chile
China
Netherlands
New Zealand
Norway
Cyprus
Czech Republic
Denmark
Finland
France
Germany
Greece
Hong Kong
Hungary
Iceland
India
Philippines
Poland
Portugal
Russia
Singapore
Slovak Republic
South Africa
Spain
Sweden
Switzerland
Taiwan
Indonesia
Turkey
Ireland
Israel
United Kingdom
United States
Italy
Japan
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Regulatory Design Considerations
This section discusses hardware considerations, safety, and Telecom labeling requirements.
Hardware Considerations
Disclaimer: Multi-Tech Systems makes no warranty claims for vendor product recommendations listed
below. Other vendor products may or may not operate satisfactorily. Multi-Tech System’s recommended
vendor products only indicate that the product has been tested in controlled conditions and were found to
perform satisfactorily.
Figure B–1. Recommended Main Board Filtering
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
EMC
Surface mount ferrites are used on T&R (Tip and Ring) to mitigate emission levels out the RJ-11
cable. 220pF capacitors are also used on T&R to reduce the common mode emissions that may be
present in certain systems. The ferrite and capacitors also aid in reducing the effects of transients that
may be present on the line.
Recommended Ferrite (SMT)
Manufacturer – Associated Component Technology (ACT) – Part # - YCB-1206
Manufacturer – Murata Erie – Part # - BLM31A601SPT
Recommended Ferrite (Thru-Hole)
Manufacturer – Associated Component Technology (ACT) – Part # - WB2-2.OT
Recommended Capacitor
Manufacturer – NOVACAP – Part # - ESZZ11NKES50ZNXT
Manufacturer – Murata Erie – Part # - GHM3045X7R221K-GC (Surface mount device) and
Part # - DE0807B221K-KH (Thru-hole device)
Manufacturer – Ever Grace Electronic Industrials -- Part # - YP221K2EA7PS
Note: The capacitors used on T&R must have a Y2 safety rating.
Recommended Connector
Manufacturer – Stewart – Part # - SS-6446-NF-A431
Recommended Fuse
Manufacturer – RayChem – Part # - TR600-150
Note: The fuse is also needed to meet UL1950 3rd edition protection against over-voltage from
power line crosses.
Telecom
The RJ-11 connector must meet FCC Part 68 requirements. Refer to FCC Part 68 section 68.500
subpart F for connector specifications. A self-healing fuse is used in series with line to help
prevent damage to the DAA circuit. This fuse is needed for FCC Part 68 compliance.
Common Mode Choke
Manufacturer – TDK – Part # - ZJYS51R5-2PT
Recommended Sidactor
Manufacturer – Teccor Electronics – Part # - P#3100SA
Manufacturer – ST Microelectronics -- Part 1 – SMP100-270
Recommended Transceiver
Manufacturer – Analog Devices – Part # - ADM207EAR
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Other Design Considerations
Good engineering practices must be adhered to when designing a printed circuit board (PCB) containing
the SocketModem module. Suppression of noise is essential to the proper operation and performance of
the modem itself and for surrounding equipment.
Two aspects of noise in an OEM board design containing the SocketModem must be considered: on-
board/off-board generated noise that can affect digital signal processing. Both on-board and off-board
generated noise that is coupled on-board can affect interface signal levels and quality. Of particular
concern is noise in frequency ranges affecting modem performance.
On-board generated electromagnetic interference (EMI) noise that can be radiated or conducted off-board
is a separate, but equally important, concern. This type of noise can affect the operation of surrounding
equipment. Most local government agencies have stringent certification requirements that must be met for
use in specific environments.
Proper PC board layout (component placement, signal routing, trace thickness and geometry, etc.)
component selection (composition, value, and tolerance), interface connections, and shielding are
required for the board design to achieve desired modem performance and to attain EMI certification.
The aspects of proper engineering practices are beyond the scope of this designer guide. The designer
should consult noise suppression techniques described in technical publications and journals, electronics
and electrical engineering text books, and component supplier application notes.
PC Board Layout Guidelines
In a 2-layer design, provide an adequate ground grid in all unused space around and under
components on both sides of the board and connect in such a manner as to avoid small islands. A
grid is preferred over a solid plane to improve solderability. Typically, the grid is composed of 0.012-
inch traces and 0.012- inch spaces on a 0.025-inch grid. Connect each grid to other grids on the
same side at several points and grids on the opposite side through the board at several points.
In a 4-layer design, provide adequate ground plane covering the entire board. In 4-layer designs,
power and ground are typically on the inner layers. All power and ground traces should be 0.05
inches wide.
Tip and Ring signal traces are to be no closer than 0.062 inches to any other traces for U.S.
applications. Tip and Ring signal traces are to be no closer than 0.078 inches (2.0 mm) from any
other traces or ground circuits for European applications. 2.0 mm spacing must be used if the host
board is to support both U.S. and European SocketModem applications.
If the SocketModem is mounted flush with the host PCB, the host PCB should be clear of all traces
directly underneath the SocketModem oscillator section (under the chip). It is strongly recommended
that the SocketModem be mounted at least 0.130 inch above the host PCB.
The recommended hole size for the SocketModem pins is 0.036 in. +/-0.003 in. in diameter. Spacers
can be used to hold the SocketModem vertically in place during the wave solder process. A spacer
should be placed on pin 32 and pin 64 of the SocketModem. A suggested part number for the spacer
is BIVAR 938-0.130 for P1(0.310in) option SocketModems. The spacers can be left on permanently
and will not effect operation.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Electromagnetic Interference (EMI) Considerations
The following guidelines are offered to specifically help minimize EMI generation. Some of these
guidelines are the same as, or similar to, the general guidelines but are mentioned again to reinforce
their importance. In order to minimize the contribution of the SocketModem-based design to EMI, the
designer must understand the major sources of EMI and how to reduce them to acceptable levels.
1. Keep traces carrying high frequency signals as short as possible.
2. Provide a good ground plane or grid. In some cases, a multilayer board may be required with full
layers for ground and power distribution.
3. Decouple power from ground with decoupling capacitors as close to the SocketModem module
power pins as possible.
4. Eliminate ground loops, which are unexpected current return paths to the power source and
ground.
5. Decouple the telephone line cables at the telephone line jacks. Typically, use a combination of
series inductors, common mode chokes, and shunt capacitors. Methods to decouple telephone
lines are similar to decoupling power lines, however, telephone line decoupling may be more
difficult and deserves additional attention. A commonly used design aid is to place footprints for
these components and populate as necessary during performance/EMI testing and certification.
6. Decouple the power cord at the power cord interface with decoupling capacitors. Methods to
decouple power lines are similar to decoupling telephone lines.
7. Locate high frequency circuits in a separate area to minimize capacitive coupling to other circuits.
8. Locate cables and connectors so as to avoid coupling from high frequency circuits.
9. Lay out the highest frequency signal traces next to the ground grid.
10. If a multilayer board design is used, make no cuts in the ground or power planes and be sure the
ground plane covers all traces.
11. Minimize the number of through-hole connections on traces carrying high frequency signals.
12. Avoid right angle turns on high frequency traces. Forty-five degree corners are good; however,
radius turns are better.
13. On 2-layer boards with no ground grid, provide a shadow ground trace on the opposite side of the
board to traces carrying high frequency signals. This will be effective as a high frequency ground
return if it is three times the width of the signal traces.
14. Distribute high frequency signals continuously on a single trace rather than several traces
radiating from one point.
Safety
All creepages and clearances for the MT5600SMI have been designed to meet requirements of
safety standards EN60950. The requirements are based on a working voltage of 250V. When the
recommended DAA circuit interface is implemented in a third party design all creepage and clearance
requirements must be strictly adhered to. The third party safety design must be evaluated by the
appropriate national agency per the required specification.
User accessible areas: Based on where the third party design is to be marketed/sold or used, it may
be necessary to provide an insulating cover over all TNV exposed areas. Consult with the recognized
safety agency to determine the requirements.
Notice: Even if the recommended design considerations are followed, there are no guarantees that a
particular system will comply with all the necessary regulatory requirements. It is imperative that
specific designs be completely evaluated by a qualified/recognized agency.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
5V Tolerant Inputs for 3.3V Modules
In order to drive the inputs of 3.3V modules from 5V logic, it is recommended to add a 1K series
resistor to each of the inputs: TXD, RTS, DTR, and RESET.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Regulatory Compliance
Regulatory Requirements for the United States
FCC Part 15 Regulation
This equipment has been tested and found to comply with the limits for a Class B digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference in a residential installation. This equipment generates, uses, and can
radiate radio frequency energy, and if not installed and used in accordance with the instructions,
may cause harmful interference to radio communications. However, there is no guarantee that
interference will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the equipment
off and on, the user is encouraged to try to correct the interference by one or more of the
following measures:
S Reorient or relocate the receiving antenna.
S Increase the separation between the equipment and receiver.
S Plug the equipment into an outlet on a circuit different from that to which the receiver is
connected.
S Consult the dealer or an experienced radio/TV technician for help.
This device complies with Part 15 of the FCC rules. Operation of this device is subject to the
following conditions: (1) This device may not cause harmful interference, and (2) this device must
accept any interference that may cause undesired operation.
WARNING – Changes or modifications to this unit not expressly approved by the party
responsible for compliance could void the user’s authority to operate the equipment.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
47 CFR Part 68 Telecom
1. This equipment complies with Part 68 of the 47 CFR rules and the requirements adopted by
the ACTA. Located on this equipment is a label that contains, among other information, the
registration number and ringer equivalence number (REN) for this equipment or a product
identifier in the format:
For current products is US:AAAEQ##Txxxx.
For legacy products is AU7USA-xxxxx-xx-x.
If requested, this number must be provided to the telephone company.
2. A plug and jack used to connect this equipment to the premises wiring and telephone network
must comply with the applicable 47 CFR Part 68 rules and requirements adopted by the
ACTA. It’s designed to be connected to a compatible modular jack that is also compliant.
3. The ringer equivalence number (REN) is used to determine the number of devices that may
be connected to a telephone line. Excessive RENs on a telephone line may result in the
devices not ringing in response to an incoming call. In most but not all areas, the sum of
RENs should not exceed five (5.0). To be certain of the number of devices that may be
connected to a line, as determined by the total RENs, contact the local telephone company.
For products approved after July 23, 2001, the REN for this product is part of the product
identifier that has the format US:AAAEQ##Txxxx. The digits represented by ## are the REN
without a decimal point (e.g., 03 is a REN of 0.3). For earlier products, the REN is separately
shown on the label.
4. If this equipment causes harm to the telephone network, the telephone company will notify
you in advance that temporary discontinuance of service may be required. But if advance
notice isn't practical, the telephone company will notify the customer as soon as possible.
Also, you will be advised of your right to file a complaint with the FCC if you believe it is
necessary.
5. The telephone company may make changes in its facilities, equipment, operations or
procedures that could affect the operation of the equipment. If this happens, the telephone
company will provide advance notice in order for you to make necessary modifications to
maintain uninterrupted service.
6. If trouble is experienced with this equipment, please contact Multi-Tech Systems, Inc. at the
address shown below for details of how to have the repairs made. If the equipment is causing
harm to the telephone network, the telephone company may request that you disconnect the
equipment until the problem is resolved.
7. Connection to party line service is subject to state tariffs. Contact the state public utility
commission, public service commission or corporation commission for information.
8. No repairs are to be made by you. Repairs are to be made only by Multi-Tech Systems or its
licensees. Unauthorized repairs void registration and warranty.
9. If your home has specially wired alarm equipment connected to the telephone line, ensure
the installation of this equipment does not disable your alarm equipment.
If you have questions about what will disable alarm equipment, consult your telephone
company or a qualified installer.
10. Connection to party line service is subject to state tariffs. Contact the state public utility
commission, public service commission or corporation commission for information.
11. This equipment is hearing aid compatible.
12. Manufacturing Information:
Manufacturer:
Trade Name
Model Number:
Registration No:
Ringer Equivalence:
Multi-Tech Systems, Inc.
SocketModem
MT5600SMI
AU7USA-46014-MD-E
0.1B
Modular Jack (USOC): RJ11
Service Center in USA: Multi-Tech Systems, Inc.
2205 Woodale Drive
Mounds View, MN 55112 U.S.A.
(763) 785-3500
(763) 785-9874 Fax
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Current Label Content and Format as of August 2003
Approved terminal equipment and approved protective circuitry shall prominently display the
following information using the format shown below:
S Responsible party
S Product Identification
S Equipment Code
S Ringer Equivalence
S Ringer Type
S Indication that the product meets the requirements of 47 CFR Part 68
The information required by the first five items shall correspond to the records in the ACTA
database of approved equipment. The required information shall be encoded in the following
format:
US:AAAEQ##Txxxx
Where:
S
S
S
US is a fixed field that indicates the equipment meets all requirements of 47
CFR Part 68 (including the requirements published by ACTA).
AAA is the responsible party’s Grantee Code obtained previously from the
FCC’s Common Carrier Bureau or currently from ACTA.
EQ is an Equipment Code indicating to the Service Provider any special signal
handling or billing requirements. The Equipment codes are listed in Annex A
(normative).
S
S
S
## is the Ringer Equivalence Number without a decimal point (e.g. REN of 1.0 =
10, REN of 0.3 = 03). In the case of a “Z” ringer, ZZ shall appear. In the case of
approved equipment without a network interface and equipment not connecting
to circuits with analog ringing supplied then “NA” shall appear.
T is the ringer type letter associated with the Ringer Equivalence Number, in
accordance with the technical requirements. In the case of approved equipment
without a network interface and equipment not connecting to circuits with analog
ringing supplied, the letter “N” shall appear.
xxxx is a product identifier, unique when combined with the responsible party’s
Grantee Code, of at least one and up to nine alphanumeric characters (including
one or more dashes (-) if desired. A dash shall not appear as the first or last
character nor shall the identifier consist entirely of dashes). The responsible
party shall define this identifier.
Label Physical Characteristics
The information required above shall be permanently affixed and legible without
magnification. It may be etched, engraved, stamped, indelibly printed or otherwise
permanently marked. Alternatively, the required information may be permanently marked on
a nameplate of metal, plastic or other material fastened to the enclosure by welding, riveting
or with a permanent adhesive. Such a nameplate shall be able to last for the expected
lifetime of the equipment and shall not be readily detachable.
Labeling Continuity and Changes
The labeling content and format requirements in effect when a product was approved shall be
effective for the life of the product. The labeling content and format requirements in effect at
approval shall also continue to be effective for modified products. However, the responsible
party shall have the option of conforming a product's labeling to current content and format
requirements at any time.
Other Label Requirements
The label shall be placed in one of the following locations in a location where it can be found
after installation:
S on an outside surface
S inside a readily available access door or panel
S on another readily accessible surface
For example, the label should not be placed on the rear of a permanently wall-mounted
device in a manner such that it is not readily accessible.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Regulatory Requirements for Canada
The following requirements are established under section 69.3 of the Telecommunications Act for
purposes of section 5 of the Telecommunications Apparatus Regulations.
Registered equipment shall bear the following identifying marks, and the Declaring Party shall ensure
that these marks are permanently affixed to the equipment:
(a) The registration number — Specifications of this mark are given in the document: Self-
Marking of the Certification/Registration Number on Terminal Equipment — Application
Procedure and Agreement; and
(b) The model identification number under which the product was registered.
A statement of compliance with Industry Canada requirements, such as the one given below, shall
accompany each unit of equipment whether registered under this procedure or previously certified:
"This product meets the applicable Industry Canada technical specifications"
For terminal equipment intended for connection to loop-start or ground-start interfaces, the Ringer
Equivalence Number (REN) must be calculated as per Section 1.8 of CS-03, Part I. A REN higher
than that determined may be assigned by manufacturers to allow for production variations. The REN
must be marked on the terminal equipment itself or added to the note below. A note similar to the
following shall accompany each unit of equipment whether registered under this procedure or
previously certified:
"The Ringer Equivalence Number is an indication of the maximum number of devices
allowed to be connected to a telephone interface. The termination on an interface may
consist of any combination of devices subject only to the requirement that the sum of the
RENs of all the devices does not exceed five".
Pursuant to section 69.3 of the Telecommunications Act, Certified or self-declared TE will bear a valid
identifying certification or registration number. The marking of the certification or registration number
on the product shall be as follows:
(a) TAC holder/DP will be responsible for permanently affixing the certification/registration
number on the TE. The certification/registration number (see example below) identifies
Certified or self-declared TE to the public, representatives of the telecommunications
common carriers, the Department, and other interested parties. The letter height must be no
less than 1.5 mm and the letters must be legible without magnification.
(b) For integrated devices, e.g. a modem or one that is intended to become a sub-assembly of
host equipment e.g. a data terminal, computer etc. that are designed to interface directly with
the network, the certification/registration number shall be affixed to the integrated device
itself.
(c) The certification/registration number for a packaged TE will denote that the total package has
been registered. However, the marking will normally be placed on that unit of the package,
which connects to the network. For example, in a PBX, the marking will be placed on the
common equipment, which connects to the network, rather than on plug-in components which
may be added later. The Terminal Equipment List will show the common equipment but not
the standard station apparatus or any proprietary station apparatus.
(d) The marking format of the certification/registration number is as follows:
IC: XXXXXX-YYYYYYYY
Where:
S The letters "IC" have no other meaning or purpose than to identify the Industry
Canada certification/registration number, and
S “XXXXXX-YYYYYYYY” is the certification/registration number; “XXXXXX” is the
Company Number¹ (CN); it consists of up to six alphanumeric characters (A-Z, 0-
9) assigned by Industry Canada; and “YYYYYYYY” is the Unique Product Number
(UPN); it consists of up to eight alphanumeric characters (A-Z, 0-9) assigned by
the applicant. Other characters, (such as & # *-) may not be used. Alphabetic
characters must be capitalized.
Note: The Company Number of registered equipment ends with an alphabetic character.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
(e) Certification Numbers granted prior to the implementation of the above marking format are
grandfathered.
(i) For previously certified TE, the self-marking format shall consist of the old certification
number preceded by “IC:” For example, if the certification number is “123 1234 A”, then the
self-mark would read “IC: 123 1234 A”.
(ii) For a new model that is registered to a family of previously certified TE, the self-marking
format shall be:
IC: XXXXXX-ZZZZZZZZ
Where:
S “XXXXXX” is the Company Number, as in (d) above ; and
S “ZZZZZZZZ” is either the old certification number minus the old company number,
or a new Unique Product Number assigned by the applicant. For example, if a
new model is registered to the family of products with certification number “123
1234 A”, and that the Company Number for the registration is “123A”, then the
self-mark for this new model would read “IC: 123A-1234 A”. If the applicant
decides to replace “1234 A” with a new UPN, say “5678", then the self-mark would
read “IC: 123A-5678".
Industry Canada
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing
Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Reglement Canadien sur
le matériel brouilleur.
Multiple Listing
This terminal device may be multiple listed to other distributors based upon the approval granted
to the original certificate holder. In order to obtain a multiple listing certification, the following
documentation must be presented to Industry Canada:
(a) The model number, Industry Canada certificate number and certification number of the
approved equipment;
(b) A letter from the original certificate holder authorizing the Department to use information
on file to grant a multiple listing certification. The name/model number, certificate number
and certification number for the subject equipment must be shown. The letter must also
declare that the model to be multiple listed is identical in design and construction to the
originally approved model;
(c) A letter, from the proposed multiple listee, requesting the certification;
(d) A Terminal Equipment Certification / Testing Application and Agreement form, completed
by the proposed multiple listee;
(e) A drawing, sample or illustration of the product label; and
(f) Payment in accordance with TRC-49 section on Multiple Listings.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
New Zealand Telecom Warning Notice
1. The grant of a Telepermit for any item of terminal equipment indicates only that Telecom has
accepted that the item complies with minimum conditions for connection to its network. It
indicates no endorsement of the product by Telecom, nor does it provide any sort of warranty.
Above all, it provides no assurance that any item will work correctly in all respects with another
item of Telepermitted equipment of a different make or model, nor does it imply that any product
is compatible with all of Telecom’s network services.
This equipment is not capable under all operating conditions of correct operating conditions of
correct operation at the higher speed which it is designated. 33.6 kbps and 56 kbps connections
are likely to be restricted to lower bit rates when connected to some PSTN implementations.
Telecom will accept no responsibility should difficulties arise in such circumstances.
2. Immediately disconnect this equipment should it become physically damaged, and arrange for its
disposal or repair.
3. This modem shall not be used in any manner which could constitute a nuisance to other Telecom
customers.
4. This device is equipped with pulse dialing, while the Telecom standard is DTMF tone dialing.
There is no guarantee that Telecom lines will always continue to support pulse dialing.
Use of pulse dialing, when this equipment is connected to the same line as other equipment, may
give rise to 'bell tinkle' or noise and may also cause a false answer condition. Should such
problems occur, the user should NOT contact the Telecom Faults Service.
The preferred method of dialing is to use DTMF tones, as this is faster than pulse (decadic)
dialing and is readily available on almost all New Zealand telephone exchanges.
5. Warning Notice: No '111' or other calls can be made from this device during a mains power
failure.
6. This equipment may not provide for the effective hand-over of a call to another device connected
to the same line.
7. Some parameters required for compliance with Telecom’s Telepermit requirements are
dependent on the equipment (PC) associated with this device. The associated equipment shall be
set to operate within the following limits for compliance with Telecom’s Specifications:
For repeat calls to the same number:
S
There shall be no more than 10 call attempts to the same number within any 30 minute
period for any single manual call initiation, and
S
The equipment shall go on-hook for a period of not less than 30 seconds between the
end of one attempt and the beginning of the next attempt.
For automatic calls to different numbers:
S
The equipment shall be set to ensure that automatic calls to different numbers are
spaced such that there is no less than 5 seconds between the end of one call attempt
and the beginning of another.
8. For correct operation, total of the RN’s of all devices connected to a single line at any time should
not exceed 5.
South African Statement
This modem must be used in conjunction with an approved surge protection device.
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Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
International Modem Restrictions
Some dialing and answering defaults and restrictions may vary for international modems. Changing
settings may cause a modem to become non-compliant with national telecom requirements in specific
countries. Also note that some software packages may have features or lack restrictions that may
cause the modem to become non-compliant.
EMC, Safety, and R&TTE Directive Compliance
The CE mark is affixed to this product to confirm compliance with the following European Community
Directives:
Council Directive 89/336/EEC of 3 May 1989 on the approximation of the laws of Member
States relating to electromagnetic compatibility;
and
Council Directive 73/23/EEC of 19 February 1973 on the harmonization of the laws of
Member States relating to electrical equipment designed for use within certain voltage limits;
and
Council Directive 1999/5/EC of 9 March on radio equipment and telecommunications terminal
equipment and the mutual recognition of their conformity.
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Index
Index
+FCLASS, 30
+GCAP, 32
+GCI, 32
+GMI, 31
+GMM, 32
+GMR, 32
+IFC, 40
+ILRR, 40
+IPR, 39
+MR, 53
+MS, 51
+PCW, 71
+PIG, 73
+PMH, 71
+PMHF, 73
+PMHR, 72
+PMHTR, 72
+PQC, 73
+PSS, 74
+QCPC, 74
+VCID, 30
+VRID, 30
A, 43
\B, 58
B, 54
D, 41
E, 36
H, 43
I, 31
\K, 58
-K, 59
L, 44
M, 44
\N, 31
O, 43
P, 42
Q, 36
-QCPS, 74
-STE, 48
T, 42
3
32-bit frame check sequence command +EFCS, 56
5
5V Tolerant Inputs for 3.3V Modules, 123
A
absolute maximum electrical and environmental
ratings, 14
answer command A, 43
AT commands, 29
definition, 29
format, 29
AT Commands
:E, 70
#UD, 65
$F, 71
%7, 33
%8, 34
%C, 62
%E, 53
%L, 47
%Q, 47
%U, 54
&C, 38
&D, 38
&F, 32
&G, 44
&K, 38
&L, 70
&P, 44
&R, 39
&S, 39
&T, 33
&V, 45
&V1, 46
&W, 33
&Y, 33
&Z, 33
)M, 70
**, 34
@M, 70
+A8E, 63
+A8I
\V, 47
V, 36
W, 36
X, 37
Z, 30
Autoanswer, 29
Autoanswer S0, 75
+DR, 61
+DS, 60
+DS44, 60
+EB, 56
+EFCS, 56
+ER
<type>, 57
+ER, 57
+ES, 55
+ESR, 56
+ETBM, 57
B
Backspace character, setting S5, 75
break control command \K, 58
break handling in error control operation command
+EB, 56
C
call termination buffer management command
+ETBM, 57
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Index
call waiting enable command +PCW, 71
Caller ID command +VCID, 30
Carrier loss disconnect time, setting S10, 76
CI signal indication command, 64
Command mode, 29
+FAA, 90
+FAE, 90
+FAR, 94
+FCL, 94
+FCLASS=1, 90
+FCLASS=1.0, 90
+FDD, 95
+FIT, 95
+FLO, 97
Command string, 29
Communications programs, 29
compromise equalizer enable command
:E, 70
connect message control command W, 36
Country code how to set, 114
Country codes supported, 114
country of installation command +GCI, 32
current and power requirements, 15
+FMI?, 96
+FMM?, 96
+FMR?, 96
+FPR, 96
+FRH, 93
+FRM, 92
+FTH, 92
+FTM, 91
+FTS, 90, 91
D
data compression command +DS, 60
data compression reporting command +DR, 61
Data mode, 29
Design considerations, 121
Vendor recommendations, 119
designate a default reset profile command &Y, 33
Dial command D, 41
disconnect (hang up) command H, 43
Disconnect delay S10, 76
display current configuration and stored profiles
command &V, 45
display last connection statistics command &V1, 46
DSR override command &S, 39
fax control reception, 88
fax control transmission, 87
fax data reception, 89
fax data transmission, 89
Fax double escape character replacement
+FDD, 95
Fax DTE inactivity timeout parameter +FIT, 95
Fax fixed DTE rate parameter +FPR, 96
Fax flow control parameter +FLO, 97
fax I/O processing, 86
fax origination, 87
Fax receive data with HDLC framing command +FRH,
93
Fax Receive Facsimile +FRM, 92
Fax Receive Silence +FRS, 91
fax request manufacturer identification parameter
+FMI?, 96
DTE-modem local flow control command +IFC, 40
DTE-modem local rate reporting command +ILRR, 40
DTR option command &D, 38
E
Fax request model identification parameter +FMM?,
96
Fax request revision identification parameter +FMR?,
96
Fax Transmit Data with HDLC Framing +FTH, 92
Fax Transmit Facsimile +FTM, 91
Fax transmit silence command +FTS, 90
FCC Regulations, 124
fixed DTE rate command +IPR, 39
flow control command &K, 38
force full startup procedure on next connection
command +QCPC, 74
echo command E, 36
Electrical Characteristics, 13
Electromagnetic Interference Considerations, 122
EMC, Safety, and R&TTE Directive Compliance, 130
enable cellular power level adjustment command )M,
70
enable quick connect profile save command -QCPS,
74
enable/disable data compression command %C, 62
enable/disable line quality monitor and auto-retrain or
fallback/fall forward command %E, 53
error control and synchronous mode selection
command +ES, 55
error control reporting command +ER, 57
Escape character S2, 75
Escape sequence, 29
Examples of calling/answering table, 98
extended result codes command X, 37
H
Handling Precautions, 13
Hangup delay S10, 76
I
identification command I, 31
F
initial cellular power level setting command @M, 70
Initialization strings, 29
initiate modem-on-hold command +PMHR, 72
International Modem Restrictions, 130
Interrupt enable register, 20
FastConnect control command $F, 71
Fax adaptive reception control parameter +FAR, 94
fax answering, 87
Fax carrier loss timeout parameter +FCL, 94
Fax Class 1 and 1.0 auto answer enable command
+FAA, 90
Interrupt Sources and Reset Control Table, 22
Fax Class 1 and Fax Class 1.0 Commands Table, 87
Fax Class 1.0 auto answer enable command +FAA,
90
L
Label content and format, 126
Fax Commands
last call status report command #UD, 65
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Index
S
leased line operation command &L, 70
Line feed character S4, 75
Safety considerations, 122
select Bell or CCITT modulation command B, 54
select Fax Class 1 command +FCLASS=1, 90
load flash memory command **, 34
local analog loopback test command &T, 33
select Fax Class 1.0 command +FCLASS=1.0, 90
select guard tone command &G, 44
M
select pulse dial make/break ratio command &P, 44
select the active service class command +FCLASS,
30
selective repeat command +ESR, 56
selects µ-Law or A-Law codec type command %U, 54
Serial Demo Board block diagram, 116
Serial Pin configurations, 9
Mechanical specifications, 8
MNP extended services command -K, 59
modem-on-hold enable command +PMH, 71
modem-on-hold timer command +PMHTR, 72
modulation reporting control command +MR, 53
modulation selection command +MS, 51
Serial Test/Demo Board Components, 115
Set pulse dial default command P, 42
set telephony extension command -STE, 48
N
New Zealand Telecom Warning Notice, 129
Set tone dial default command T, 42
single line connect message enable command \V, 47
O
Soft reset and restore profile command Z, 30
South African Statement, Regulations, 129
speaker control command M, 44
speaker volume command L, 44
Online command mode, 29
operating conditions, 14
operating mode command \N, 31
Specifications, technical, 7
S-registers, 75
P
S0, 75
S1, 75
S10, 76
S11, 76
S11-20, 76
S12, 76
S14, 76
S16, 76
S2, 75
S21, 77
S210, 82
S22, 77
S23, 77
S24, 77
Parallel Demo Board block diagram, 117
Parallel Host Interface, 18
Parallel Interface Registers Table, 19
Parallel Pin configurations, 11
Part 68 of the FCC rules, 125
PC Board Layout Guidelines, 121
PCM upstream ignore command +PIG, 73
Phase 1 and Phase 2 control command +PQC, 73
Physical dimensions, 8
plug and plag vendor ID and product number
command %8, 34
plug and play serial number command %7, 33
Programmable Baud Rates Table, 27
S25, 77
S26, 77
Q
S27, 78
S28, 78
quiet result code control command Q, 36
S29, 78
S3, 75
S30, 78
S31, 78
R
Receiver FIFO Interrupt Operation, 28
Register Signal Definitions, 20
report line signal level command %L, 47
report line signal quality command %Q, 47
report retrieved with Caller ID command +VRID, 30
report the current error control command +ER
<type>, 57
S36, 79
S38, 79
S39, 79
S4, 75
S40, 79
request complete capabilities command +GCAP, 32
request model identification command +GMM, 32
request modem manufacturer command +GMI, 31
request revision identification command +GMR, 32
restore factory default configuration (profile)
command &F, 32
result code form command V, 36
Result codes, 29, 83
return to on-line data mode command O, 43
Rings S0, setting number of, 75
RLSD (DCD) option command &C, 38
RTS/CTS option command &R, 39
S41, 80
S46, 80
S48, 80
S5, 75
S6, 75
S7, 75
S8, 75
S86, 81
S9, 76
S91, 81
S95, 81
store current configuration command &W, 33
store telephone number command &Z, 33
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Index
T
+VDR, 112
+VDT, 113
+VGR, 105
+VGT, 106
+VIP, 104
Technical specifications, 7
Telecommunications Regulations for Canada, 127
transmit break to remote command \B, 58
Transmitter FIFO Interrupt Operation, 28
+VIT, 106
+VLS, 107
+VNH, 103
U
+VPR, 113
+VRA, 110
use short sequence command +PSS, 74
+VRN, 110
+VRX, 104
V
+VSD, 110
+VSM, 111
+VTD, 112
+VTS, 104
V.44 data compression select command +DS44, 60
V.8 and V.8bis operation control command +A8E, 63
V.92 modem-on-hold hook flash command +PMHF,
73
+VTX, 105
Voice commands
Voice commands summary table, 100
+FCLASS=8, 103
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