DSC-200/ 300
Two Channel RS-422/ 485 Asynchronous
Communications Adapter
for PCI bus
User's Manual
QUATECH, INC.
5675 Hudson Industrial Parkway
Hudson, Ohio 44236
TEL: (330) 655-9000
FAX: (330) 655-9010
http:/ / www.quatech.com
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(c) 1998 - 2000, Quatech, Inc.
NOTICE
The information contained in this document cannot be reproduced in any form
without the written consent of Quatech, Inc. Likewise, any software programs that might
accompany this document can be used only in accordance with any license agreement(s)
between the purchaser and Quatech, Inc. Quatech, Inc. reserves the right to change this
documentation or the product to which it refers at any time and without notice.
The authors have taken due care in the preparation of this document and every
attempt has been made to ensure its accuracy and completeness. In no event will Quatech,
Inc. be liable for damages of any kind, incidental or consequential, in regard to or arising out of
the performance or form of the materials presented in this document or any software
programs that might accompany this document.
Quatech, Inc. encourages feedback about this document. Please send any written
comments to the Technical Support department at the address listed on the cover page of this
document.
DOS, Windows ME, Windows 2000, Windows 98, Windows 95, Windows NT are trademarks
or registered trademarks of Microsoft Corporation. OS/ 2 is a registered trademark of IBM
Corporation. All other trademarks or registered trademarks are property of their respective
owners.
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Declaration of Conformity
Manu factu rer's N am e:
Quatech Inc.
Manufacturer's Ad d ress:
5
5675 Hudson Industrial Parkway
Hudson, Ohio 44236 (USA)
Application of Council Directive:
89/ 336/ EEC
Standards to which
Conform ity is Declared :
* EN50081-1 (EN55022,
EN60555-2, EN60555-3)
* EN50082-1 (IEC 801-2,
IEC 801-3, & IEC 801-4)
Typ e of Equipment:
Equipment Class:
Prod u ct N am e:
Information Technology
Equipment
Commercial, Residential, & Light
Industrial
PCI Dual Serial Communications
Card
Mod el N u m ber :
DSC-200/ 300 (750,IND)
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1 General Information
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1 Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.1.1 "IND" Option --- Surge Suppression Upgrade . . . . . . . . . . . 8
2 Hardware Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 RS-422 or RS-485 Signal Line Termination . . . . . . . . . . . . . . . . . . 9
2.2 Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.3 Full-duplex/ Half-duplex Operation . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 Clock Rate and Optional Registers . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.4.1 Enable Scratchpad Register (SPAD, J13) . . . . . . . . . . . . . . . . . 11
2.4.2 Force High-Speed UART Clock (X2, X4, or X8,
J10-J12) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3 Hard w are Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Address Map and Special Registers
. . . . . . . . . . . . . . . . . 14
4.1 Base Address and Interrupt Level (IRQ) . . . . . . . . . . . . . . . . . . . 14
4.2 Enabling the Special Registers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.3 Interrupt Status Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.4 Options Register . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
4.4.1 Enhanced Serial Adapter Identification . . . . . . . . . . . . . . . . . 16
4.4.2 Clock Rate Multiplier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 Wind ow s Configuration
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.1 Windows Millennium . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
5.2 Windows 2000 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
5.3 Window s 98 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.4 Window s 95 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5.5 Using the "New Hard w are Found " Wizard . . . . . . . . . . . . . . . . 23
5.6 Wind ow s N T . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
6 DOS and Other Operating Systems
. . . . . . . . . . . . . . . . . . 25
6.1.1 QTPCI.EXE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
7 OS/ 2
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
8 External Connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
8.1 RTS/ cts Handshake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.2 RCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
8.3 XCLK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.4 AUXIN/ AUXOUT Loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
8.5 Half-Duplex/ Full-Duplex Selection . . . . . . . . . . . . . . . . . . . . . . . . . 32
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8.6 Termination Resistors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
8.7 RS-422/ 485 Peripheral Connection . . . . . . . . . . . . . . . . . . . . . . . . . . 35
9 PCI Resource Map
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
10 Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
11 Troubleshooting
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
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1 General Information
The Quatech, Inc. DSC-200/ 300 provides two RS-422 or RS-485 asynchronous
serial communication interfaces for IBM-compatible personal computer systems using
the PCI expansion bus. The DSC-200/ 300 uses Quatech's new Enhanced Serial Adapter
design. Legacy serial port data rates are limited to a maximum of 115,200 bits per
second. Quatech Enhanced Serial Adapters can achieve data rates as high as 921,600
bits per second.
As a PCI device, the DSC-200/ 300 requires no hardware configuration. The card
is automatically configured by the computer's BIOS or operating system. The two
serial ports share a single interrupt line and are addressed in a contiguous block of 16
bytes. A special interrupt status register is provided to help software to manage the
shared interrupt.
The DSC-200/ 300's serial ports are using 16750 Universal Asynchronous
Receiver/ Transmitters (UARTs). These UARTs contain hardware buffers (FIFOs) which
reduce processing overhead and allow higher data rates to be achieved. The 16750
contains a 64-byte FIFO and can transmit and receive data at a rate of up to 921,600 bits
per second. The 16750 is recommended for heavy multitasking environments and for
applications involving high data rates.
The DSC-200/ 300 is supported under several popular operating systems and
environments. Contact the sales department for details on current software offerings.
Most device drivers are available for download from the Quatech world wide web site
at http:/ / www.quatech.com.
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1.1 Features
The standard DSC-200/ 300 implements each of its communication channels with
a 16750 UART and uses standard line driver and receiver components. For improved
performance and industrial-grade reliability.
1.1.1 "IN D" Option --- Surge Suppression Upgrade
The "IND" upgrade provides the protection essential for reliable use in an
industrial environment. Each communication line has a surge suppressor capable of
sustaining up to 40A 20us peak transient surges, a clamping voltage of 30V and a peak
energy dissipation of 0.1 Joules.
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2 Hardware Configuration
The DSC-200/ 300 is automatically configured at boot time by the computer's
BIOS or operating system. There are no required switches or jumpers to set for
installation.
This chapter lists a number of jumper settings that control various hardware
features. Jumpers J1-J4, located in a column near the D-9 connectors, control the RS-422
or RS-485 signal line termination. Jumpers J5-J8, located in a column just to the right of
J1-J4, control how signals are routed from the UARTs to the connector, as well as full- or
half- duplex operation. Jumpers J10-J13, grouped together at the end of the board
opposite the D-9 connectors, control special options.
Any changes from the factory default should be made before installing the
DSC-200/ 300 in the computer.
2.1 RS-422 or RS-485 Signal Line Termination
Jumpers J1-J4 allow the selection of 100-ohm RS-422 termination, 120-ohm RS-485
termination, or no termination at all. The factory default, shown in Figure 1, is RS-422
termination. For full details, see page 24.
Jumpers J1-J4
3
2
1
RS-422 termination
(100 ohms)
(factory default)
Figure 1 --- Factory default signal termination settings
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2.2 Signal Connections
The DSC-200/ 300 provides each of two serial ports with four differential signal
pairs: TxD, RxD, AUXOUT, and AUXIN. TxD and RxD are always present at the
connector. The AUXOUT and AUXIN signals can be used to support RTS/ CTS
handshaking, external clocking, or external signal loopback. The factory default
configuration, as shown in Figure 2, is a loopback of AUXOUT to AUXIN at the
connector, with RTS and CTS looped back on the board. There is an extensive
discussion of this topic starting on page 19.
2.3 Full-duplex/ Half-duplex Operation
The DTR or RTS modem control output of the UART can be used to enable and
disable the transmit drivers. The inverse of these signals can also be used to enable
and disable the receivers. These options are selectable per channel. The factory
default, as shown in Figure 2, is for both the drivers and receivers of both channels to
be continuously enabled. Two spare jumpers are installed in neutral positions. For
details, refer to page 22.
The DSC-200/ 300 is shipped from the factory with each channel configured as
shown in Figure 2.
XC LK 6
3
2
RC LK
AUXIN
C TS
Jumpers J5, J7
5
4
AUXOUT
RTS
1
Loopback RTS to CTS
Loopback AUXOUT to AUXIN
Loopback XCLK to RCLK
3
Rx ENAB LE
Tx ENAB L
Jumpers J6, J8
2 RTS
Tx ENAB LE5
Tx ENAB LE4
1
DTR
Full Duplex Operation
(spare jumpers supplied)
Figure 2 --- Factory default signal interface settings
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2.4 Clock Rate and Optional Registers
Figure 3 shows the jumper configuration as shipped from the factory, with two
spare jumpers applied in neutral positions. Remove one or both and apply as shown
in following subsections to set optional features.
J10
J11
J12
X2
X4
X8
SPAD
J13
Figure 3 --- Factory default clock rate and options settings
2.4.1 Enable Scratchpad Register (SPAD, J13)
In the default configuration, an Interrupt Status Register and an Options Register
(see page 10) replace the scratchpad (base address + 7) of each UART. If the SPAD
jumper is applied as in Figure 4, the UART scratchpad registers are enabled, and the
Interrupt Status Register and the Options Register are not available.
J10
J11
J12
X2
X4
X8
SPAD
J13
Figure 4 --- Enable scratchpad registers
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2.4.2 Force High-Speed UART Clock (X2, X4, or X8, J10-J12)
These jumpers force an increase of the UART input clock frequency by a factor of
two, four, or eight. This feature can allow legacy software to use baud rates above
115,200 bits per second. It is also useful if the serial port device driver does not directly
support setting the higher baud rates through the Options Register (see page 10).
If one of these jumpers is applied, it overrides any value written to the Options
Register to set the clock multiplier by software. The effective baud rate will be either
two, four, or eight times the value for which the UART itself is programmed.
The factory default is none of these jumpers applied, which allows for software
control of the clock multiplier via the Options Register. The Options Register powerup
default is for a standard times-1 clock of 1.8432 MHz for compatibility with standard
serial ports.
J10
J11
J12
J10
J11
J12
X2
X4
X2
X4
X8
X8
SPAD
SPAD
J13
J13
Force times-two clock
Baud rates up to 230.4 kbps
Factory default
software control
J10
J10
J11
J12
X2
X4
X2
X4
J11
J12
X8
X8
SPAD
SPAD
J13
J13
Force times-eight clock
Force times-four clock
Baud rates up to 460.8 kbps
Baud rates up to 921.6 kbps
Figure 5 --- Clock multiplier jumper options
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3 Hard w are Installation
1. Turn off the power of the computer system in which the DSC-200/ 300 is to be
installed.
2. Remove the system cover according to the instructions provided by the
computer manufacturer.
3. Make any desired optional jumper setting changes.
4. Install the DSC-200/ 300 in any empty PCI expansion slot. The board should be
secured by installing the Option Retaining Bracket (ORB) screw.
5. Replace the system cover according to the instructions provided by the
computer manufacturer.
6. Attach and secure the cable connectors to the desired equipment.
7. Turn on the power of the computer system.
The output of the DSC-200/ 300 is two female 9-pin D-connectors.
Termination select
Clock multiplier/
scratchpad select
Serial
Port
2
J5
J6
J1
J2
J3
port 1
port 2
J 1 0
J 1 1
J 1 2
J 1 3
X2
X4
X8
SP AD
J7
J8
J4
Serial
Port
1
Interface configuration
Figure 6 --- Jumper/ connector locations
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4 Address Map and Special Registers
This chapter explains how the two UARTs and special registers are addressed,
as well as the layout of those registers. This material will be of interest to programmers
writing driver software for the DSC-200/ 300.
4.1 Base Address and Interrupt Level (IRQ)
The base address and IRQ used by the DSC-200/ 300 are determined by the BIOS
or operating system. Each serial port uses 8 consecutive I/ O locations. The two ports
reside in a single block of I/ O space in eight byte increments, for a total of 16
contiguous bytes, as shown in Figure 7.
Channel
Port 1
I/ O Address Range
Base Address + 0 to Base Address + 7
Base Address + 8 to Base Address + 15
Port 2
Figure 7 --- Port Address Map
All two serial ports share the same IRQ. The DSC-200/ 300 signals a hardware
interrupt when any port requires service. The interrupt signal is maintained until no
port requires service. Interrupts are level-sensitive on the PCI bus.
The base address and IRQ are automatically detected by the device drivers
Quatech supplies for various operating systems. For cases where no device driver is
available, such as for operation under DOS, Quatech supplies the "QTPCI" DOS
software utility for manually determining the resources used. See page 17 for details.
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4.2 Enabling the Special Registers
The DSC-200/ 300 contains two unique registers, an Interrupt Status Register and
an Options Register. These registers are enabled when the SPAD jumper (J13) is
removed (factory default). They replace the UART Scratchpad Register on accesses to
register address 7.
The Interrupt Status Register and Options Register are accessed through the
scratchpad location of any UART. The DLAB bit of the UART (Line Control Register,
bit 7) is used to select between the two registers. The most recent write of a DLAB bit in
any UART selects between the two registers as shown in Figure 8.
Register selected for
DLAB Bit SPAD Jumper
address 7 accesses
0
1
X
removed
removed
applied
Interrupt Status Register
Options Register
Scratchpad Registers
Figure 8 --- DLAB bit selects between special registers
4.3 Interrupt Status Register
The read-only Interrupt Status Register can be used to quickly identify which
serial ports require servicing after an interrupt. Reading the Interrupt Status Register
will return the interrupt status of the entire DSC-200/ 300, as shown in Figure 9. The
individual bits are cleared as the interrupting ports are serviced. The interrupt service
routine should ensure that the interrupt status register reads zero before exiting.
Bit
Description
0 (not used)
7 (MSB)
6
5
4
3
2
1
0
0 (not used)
0 (not used)
0 (not used)
0 (not used)
0 (not used)
Port 2 --- 1 if interrupt pending
Port 1 --- 1 if interrupt pending
Figure 9 --- Interrupt Status Register
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4.4 Options Register
The Options Register allows software to identify the DSC-200/ 300 as a Quatech
Enhanced Serial Adapter. It also allows software to set the UART clock rate multiplier.
Figure 10 shows the structure of the Options Register.
The powerup default of the Options Register is all bits zero.
Bit
N am e
Description
ID bit 1
7 (MSB)
ID1
6
5
4
3
2
1
0
ID0
ID bit 0
-
(reserved, 0)
-
-
(reserved, 0)
(reserved, 0)
-
(reserved, 0)
RR1
RR0
Clock rate multiplier bit 1
Clock rate multiplier bit 0
Figure 10--- Options Register bit definitions
4.4.1 Enhanced Serial Adapter Identification
The ID bits are used to identify the DSC-200/ 300 as a Quatech Enhanced Serial
Adapter. Logic operations are performed such that the values read back from these bits
will not necessarily be the values that were written to them. Bit ID1 will return the
logical-AND of the values written to ID[1:0], while bit ID0 will return their
exclusive-OR.
Software can thus identify a Quatech Enhanced Serial Adapter by writing the ID
bits with the patterns shown in the "write" column of Figure 11, then reading the bits
and comparing the result with the patterns in the "read" column. Matching read
patterns verify the presence of the Options Register.
Write
Read
ID1 ID0 ID1 ID0
0
0
1
1
0
1
0
1
0
0
0
1
0
1
1
0
Figure 11 --- ID bit write/ read table
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4.4.2 Clock Rate Multiplier
A standard serial port operates at a clock speed of 1.8432 MHz. In order to
achieve higher data rates, Quatech Enhanced Serial Adapters can operate at two times,
four times, or even eight times this standard clock speed. This is controlled by the
clock rate multiplier bits in the Options Register.
Software can determine the UART clock frequency by reading the clock rate
multiplier bits RR1 and RR0 in the Options Register as shown in Figure 12. RR1 and
RR0 can be set by writing to the Options Register if the X2, X4, and X8 jumpers (J10-J12)
are all removed. If one of these jumpers is applied, the RR1 and RR0 bits are forced to
the appropriate value. Reading the Options Register will always return the clock rate
multiplier at which the board is operating.
Clock Rate
Multiplier
UART Clock
Frequency
Maxim u m Data
Rate
RR1 RR0
X1
(default)
X2
0
0
1.8432 MHz
115.2 kbaud
0
1
1
1
0
1
3.6864 MHz
7.3728 MHz
14.7456 MHz
230.4 kbaud
460.8 kbaud *
921.6 kbaud *
X4
X8
* 16750 UART only
Figure 12 --- Rate Register bit definition
At powerup and reset, the Options Register is initialized to 0. The DSC-200/ 300
will thus powerup in the x1 mode with software control of the clock rate multiplier
enabled as long as the X2, X4, and X8 jumpers are not installed.
Software can control high baud rates through a combination of changing the
clock rate multiplier and the UART baud rate divisor. For example, a baud rate of
230.4 kbps could be achieved by setting the clock rate multiplier to X2 mode (or by
applying the X2 jumper) and setting a software application for 115.2 kbps.
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5 Wind ow s Configuration
5.1 Window s Millennium
1. After inserting the DSC 200/ 300 for the first time the "Add New Hardware
Wizard" will begin. Select "Search for the best driver for your device.". Check the
"Removable media" and "Specify location" box. Click the "Next" button.
3. Window will locate the proper INF file and copy the file from the CD. Click
the "Next" button.
4. The final dialog screen will verify the file copy from the CD. Click the
"Finish" button.
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5.2 Windows 2000
1.
After inserting a DSC-200/ 300 for the first time, the "Add New Hardware
Wizard will appear at start up. Click the "OK" button.
2. The following dialog box insert the Quatech COM CD (shipped with the device).
Click the "OK" button.
4.
5.
The following dialog box will display the appropriate INF file on the CD in
drive. Click the "OK" button.
Window will copy the INF file from the CD and display a final dialog
indication that the process is complete. Click the "Finish" button.
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5.3 Window s 98
1.
After inserting a DSC-200/ 300 for the first time, the "Add New Hardware
Wizard will appear at start up. Click the "Next" button.
2. Select "Search for the best driver for you device". Click the "Next" button.
3.
On the next dialog, select the "CD-ROM DRIVE" check box. Insert the Quatech
COM CD (shipped with the device) into the CD-ROM drive.
Click the "Next" button.
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4.
5.
The following dialog box will display the appropriate INF file on the diskette in
drive. Click the "Next" button.
Window will copy the INF file from the diskette and display a final dialog
indication that the process is complete. Click the "Finish" button.
5.4 Window s 95
The following instructions provide step-by-step instructions on viewing
resources used by the DSC-200/ 300 in Windows 95 using the "Device Manager"
utility. Select "Start" then "Help" from within Windows 95 for additional
information.
1. Double click the "System" icon inside the Control Panel folder. This opens up
the System Properties box.
2. Click the "Device Manager" tab located along the top of the System Properties
box. This lists all hardware devices registered inside the Windows 95 registry.
Additional information is available on any of these devices by click on the
device name and then selecting the "Properties" button.
3. Double click the device group "Multi-function Adapters". The DSC-200/ 300
model name should appear in the list of Multi-function adapters.
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4. Double click the DSC-200/ 300 model name and a properties box should open for
the hardware adapter.
5. Click the "Resources" tab located along the top of the properties box to view the
resources Windows 95 has allocated for the DSC-200/ 300 match the hardware
configuration. Because PCI is a true plug-and-play bus, do not attempt to
modify the configuration values listed. Click "Cancel" to exit without making
changes.
6. The DSC-200/ 300 serial ports are also listed under the group Ports (COM and
LPT). Windows 95 does not assign COM1-COM4 to ports addressed at
nonstandard locations. The DSC-200/ 300 ports will be enumerated starting with
COM5 (or higher) even if lower logical numbers are available.
7. Select any of the Quatech Serial Ports listed under the group Port (COM and
LPT) and click the "Properties" button. This action opens a properties dialog for
the specific COM port on the DSC-200/ 300.
8. Click the "Port Settings" tab and then click the "Advanced" button. The
DSC-200/ 300 driver will display a custom Advanced Port Settings control, which
allows the ports UART compatibility mode and FIFO threshold levels to be
configured. The threshold values of full-scale for the transmit buffer and
3/ 4-scale for the receive buffer shown below are optimal for most applications.
Note that the FIFO option for each of the DSC-200/ 300's two ports is configured
independently.
9. Use the Logical COM Port names to access the serial ports on your DSC-200/ 300
through your software applications. Note: The Logical COM Port name is
assigned to your ports by Windows 95. This name is required by a Windows 95
application when accessing a particular port.
Windows 95 maintains a registry of all known hardware installed in your
computer. Inside this hardware registry Windows 95 keeps track of all of your system
resources, such as I/ O locations, IRQ levels, and DMA channels. The "Add New
Hardware Wizard" utility in Windows 95 was designed to add new hardware and
update this registry.
An "INF" configuration file is included with the DSC-200/ 300 to allow easy
configuration in the Windows 95 environment. Also a custom Windows 95 serial
device driver is included with the DSC-200/ 300 to support the use of the 16750 UART's
64 byte FIFO. Windows 95 uses the "INF" file to determine the system resources
required by the DSC-200/ 300, searches for available resources to fill the boards
requirements, and then updates the hardware registry with an entry that allocates these
resources.
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5.5 Using the "N ew H ard w are Found" Wizard
The following instructions provide step-by-step instructions on installing the
DSC-200/ 300 in Windows using the "New Hardware Found " wizard.
1. After booting the computer with a newly-installed DSC-200/ 300, the "New
Hardware Found" dialog box will appear. If you have never installed a Quatech
PCI communications adapter before, the dialog box may simply indicate that it
has found a "PCI Card."
2. Select the radio button for "Driver from disk provided by hardware
manufacturer." Click the "OK" button to continue.
3. An "Install From Disk" dialog box should pop up. Insert the CD with the
Quatech INF files on it, select the correct drive letter, and click the "OK" button.
Windows automatically browses the root directory for an INF file that defines
configurations for Multi-function Adapters. If no INF files are found, click the
"Browse" button and search the Win95 sub directory on the installation diskette.
You are not required to select the file name. After finding the directory
containing the INF files, Windows will choose the correct file.
4. The "New Hardware Found" dialog box will appear again, this time for an
"Unknown Device."
5. Again select the radio button for "Driver from disk provided by hardware
manufacturer." Click the "OK" button to continue.
6. Another "Install From Disk" dialog box will pop up. The path should already be
pointing to the Quatech diskette. Click the "OK" button to continue.
7. You should now see the "Copying Files" dialog box as Windows 95 copies the
driver files from the diskette.
8. The installation utility will ask for your Window installation disks. Serial
communication ports require two drivers supplied by Microsoft to function:
SERIAL.VXD and SERIALUI.DLL. Insert the disk or CD and click "OK".
NOTE:
You may be able to skip this step if you are certain that your system has the
latest version of these files installed. If you do not have your Windows 95
install CD immediately available, click "OK" anyway. A dialog box
appears with an option to Skip the files. Click the Skip button and the files
will not be installed. This is all right if the latest version of these drivers
are currently in the \ WINDOWS\ SYSTEM directory.
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9. The "New Hardware Found" dialog will repeat for each of the serial ports on the
DSC-200/ 300 as each port is registered with Windows.
10. Installation is complete.
5.6 Wind ow s N T
The Windows NT device driver is installed by running the SETUP program. Up
to 256 serial ports are supported. There is a command line-based configuration utility
which is used for adding PCI bus and ISA bus serial ports. Please refer to the
documentation included with the device driver for full installation and configuration
details.
Device drivers for Windows and OS/ 2 are also available for the DSC-200/ 300.
The board can be used under DOS and other operating systems as well in many
circumstances. The software described below can be obtained from the Quatech web
site if it did not come with the board.
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6 DOS and Other Operating Systems
The DSC-200/ 300 is not a direct drop-in replacement for a legacy serial port
because its base address and IRQ cannot be fixed at values such as 3F8 hex, IRQ 4
(COM1) or 2F8 hex, IRQ 3 (COM2), etc. Rather, the system BIOS assigns the address
and the IRQ in a plug-and-play fashion at boot time. Software which is to use the
DSC-200/ 300 must be able to accommodate any valid assignments of these resources.
For Windows and OS/ 2, the Quatech device drivers determine what the
resource assignments are and proceed accordingly. In other cases, however, the user
must intervene. The discussion below will center on DOS, but the concepts can be
applied to other operating systems as well.
Many DOS applications support user configuration of the base address and IRQ
of a serial port. Such applications can generally make use of the DSC-200/ 300. Older
applications, as well as some custom software, may use hard-coded standard legacy
serial port addresses. These applications will require modifications to support PCI
devices.
Custom applications for which the customer has source code can be modified to
make just a few PCI BIOS function calls to obtain all the necessary configuration
information. The PCI BIOS specification can be obtained from the PCI Special Interest
Group. Contact Quatech technical support for more information.
6.1.1 QTPCI.EXE
Quatech's "QTPCI" utility supplies the information required when modifying
the serial port settings of the application. This program should be run from real DOS,
not in a Windows DOS box.
Figure 15 shows the Basic Mode display for the DSC-200/ 300 after the "Q" key
has been pressed. In this example, the DSC-200/ 300 uses I/ O base address FFA0 hex
and IRQ 3. The hardware revision of the DSC-200/ 300 is also displayed. Pressing the
"N" key will show similar information for all non-Quatech PCI devices in the system,
including those devices integrated on the motherboard.
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The QTPCI program is capable only of displaying the PCI configuration. It
cannot be used to make changes.
Quatech PCI Configuration Information Display Software
Version 1.00
INSTRUCTIONS:
------------------------
Press keys listed in the menu at the bottom of the screen.
This program only displays information. It cannot make changes.
Numbers preceeded by "0x" are hexadecimal.
PCI BIOS detected, version 2.10
Quatech PCI adapters detected
---------------------------------------------
DSC-200/300 Two-port RS-422/485 adapter
Uses IRQ 3
(Hardware Revision A1)
Base addr 1 = 0xffa80
_
I/O
M - Change to Expert Mode
Q - Quatech PCI adapters
N - Other PCI devices
X - EXIT
Figure 15 --- QTPCI.EXE Basic Mode display
Figure 16 shows the Expert Mode display for the DSC-200/ 300 after the "Q" key
has been pressed. The information from the Basic Mode display is presented along
with more details such as the Vendor and Device IDs, PCI Class Code, size of memory
and I/ O regions, etc. Pressing the "N" key will show similar information for all
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non-Quatech PCI devices in the system, including those devices integrated on the
motherboard. In this example, the "Base addr 0" resource is reserved.
For users interested in even more details, PCI BIOS information can be
displayed by pressing the "B" key. Pressing the "I" key displays the PCI interrupt
routing table.
Quatech PCI Configuration Information Display Software
Version 1.00
Quatech PCI adapters detected
---------------------------------------------
DSC-200/300 Two-port RS-422/485 adapter
Vendor ID 0x135c, Device id 0x0050 found in slot 0x04 on bus 0x00
Device/function code = 0x98, Revision ID = 0x01 (Hardware revision A1)
PCI Class Code = 0x070200 Communications controller, multiport serial
Subsystem Vendor ID 0x135c, Subsystem Id 0x0050
INTA# mapped to IRQ 11 (route 0x61)
Base addr 0 = 0xfc80
Base addr 1 = 0xffa80
_
I/O
I/O
0X80 bytes allocated
0X40 bytes allocated
M - Change to Basic Mode
B - PCI BIOS details
I - Interrupt routing details
Q - Quatech PCI adapters
N - Other PCI devices
X - EXIT
Figure 16 --- QTPCI.EXE Expert Mode display
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7 OS/ 2
The OS/ 2 device driver supports up to 32 serial ports in a system. Installation is
a manual, but simple, process. Please refer to the read me documentation included on
the Quatech COM CD with the device driver for full installation and configuration
details.
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8 External Connections
The DSC-200/ 300 provides four differential communication signals per channel.
The two output signals are Transmit Data (TxD) and Auxiliary Output (AUXOUT). The
two input signals are Receive Data (RxD) and Auxiliary Input (AUXIN). A ground
signal is also provided.
The available input signals for AUXIN are Clear To Send (CTS) and the Receive
Clock (RCLK). The available output signals for AUXOUT are Request To Send (RTS),
the Transmit Clock (XCLK), and the AUXIN signal (for loopback). Either half-duplex or
full-duplex operation can be selected for each communications channel. If half-duplex
operation is selected, one of the UART's signals (either DTR or RTS) is used to enable
the transmitter drivers. The inverse of the transmitter enable can be used to enable the
receiver drivers.
Factory-installed resistors allow for signal line termination in compliance with
the RS-422 and RS-485 standards. The desired termination can be selected or removed
per port by applying a jumper.
Configuration is done using jumpers J1 through J4 for termination selection, and
jumpers J5 through J8 for interface signal routing. Each jumper block provides the
same functions for its particular channel.
Channel
Port 1
Termination
J1, J2
Signal routing
J5, J6
Port 2
J3, J4
J7, J8
Figure 17 --- Jumper/ Channel correspondence
XC LK 6
3
2
RC LK
AUXIN
C TS
Jumpers J5, J7
Jumpers J6, J8
5
4
AUXOUT
RTS
1
6
3
Rx ENAB LE
Tx ENAB LE
2 RTS
Tx ENAB LE5
Half-duplex
if 3-6 shorted
Tx ENAB LE
4
1
DTR
Figure 18 --- Pinout of jumpers J5-J8
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8.1 RTS/ CTS Hand shake
Transmission of RTS, combined with reception of CTS, allows for hardware
handshaking (data flow control) between the UART and the external device. RTS is
transmitted on AUXOUT by connecting pins 4 and 5 of the jumper block. CTS is
received on AUXIN by connecting pins 1 and 2 of the jumper block. If RTS/ CTS
handshaking is not desired, the RTS output can be looped back to the CTS input by
connecting pins 1 and 4 of the jumper block. Figure 19 shows how to select the
RTS/ CTS mode.
Jumpers J5, J7
3
2
XC LK 6
RC LK
AUXIN
3
2
XC LK 6
RC LK
AUXIN
AUXOUT 5
5
4
AUXOUT
RTS
RTS
4
1
C TS
1
C TS
Transmit RTS on AUXOUT
Receive CTS on AUXIN
Loopback RTS to CTS
Figure 19 --- RTS/ CTS selection
8.2 RCLK
This is the clock signal used by the receiver portion of the UART. It is generally
provided by connecting it to the UART's own transmit clock output (XCLK). This is
done by connecting pins 3 and 6 of the jumper block. If desired, RCLK can be received
from an external source over the AUXIN line by connecting pins 2 and 3 of the jumper
block. Figure 20 shows how to select the RCLK mode.
Jumpers J5, J7
3
2
XC LK 6
RC LK
AUXIN
6
5
4
3
2
XC LK
AUXOUT
RTS
RC LK
AUXIN
AUXOUT 5
RTS
4
1
C TS
1
C TS
Loopback XCLK to RCLK
Receive RCLK on AUXIN
Figure 20 --- RCLK selection
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8.3 XCLK
This is the output clock signal used by the transmitter portion of the UART. It is
generally connected to the UART's own receive clock input (RCLK). This is done by
connecting pins 3 and 6 of the jumper block. If desired, XCLK can be transmitted to an
external source over the AUXOUT line by connecting pins 5 and 6 of the jumper block.
Figure 21 shows how to select the XCLK mode.
Jumpers J5, J7
3
2
XC LK 6
RC LK
AUXIN
XC LK 6
3
2
RC LK
AUXIN
C TS
AUXOUT 5
5
4
AUXOUT
RTS
RTS
4
1
C TS
1
Loopback XCLK to RCLK
Transmit XCLK on AUXOUT
Figure 21 --- XCLK selection
8.4 AUXIN/ AUXOUT Loopback
The AUXIN signal is an input from the external device, and connecting it to the
AUXOUT signal provides for a loopback mode of operation. In other words, whatever
signal is transmitted by the external device over the AUXIN line will be fed back to the
external device over the AUXOUT line. This mode is accomplished by connecting pins
2 and 5 of the jumper block. Figure 22 shows how to select this loopback mode.
Jumpers J5, J7
XC LK 6
3
2
RC LK
AUXIN
C TS
AUXOUT 5
RTS
4
1
Loopback AUXOUT to AUXIN
Figure 22 --- AUXIN/ AUXOUT loopback
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8.5 Half-Duplex/ Full-Duplex Selection
Using jumper blocks J6 and J8, the transmitters and receivers of each channel can
be enabled and disabled by modem control signals. This allows operation in both
half-duplex or full-duplex modes.
The transmit drivers can be controlled by either the Data Terminal Ready (DTR)
or the Request to Send (RTS) output from the UART. If a jumper is applied between
pins 1 and 4, the drivers are enabled for TxD and AUXOUT when the UART's DTR
signal is asserted. If a jumper is applied between pins 2 and 5, the drivers are enabled
for TxD and AUXOUT when the UART's RTS signal is asserted. If neither of these
jumpers is applied, the drivers remain enabled at all times. When disabled, the
transmit drivers enter a high-impedance state.
The receivers can be controlled by the inverse of the transmit enable. If a jumper
is applied between pins 3 and 6, the receivers for RxD and AUXIN will be disabled
when the transmit drivers are enabled and vice-versa (based on the DTR or RTS
connections on pins 1-4 or 2-5).
To operate in half-duplex DTR mode, apply jumpers between pins 1 and 4 and
pins 3 and 6. To operate in half-duplex RTS mode, apply jumpers between pins 2 and
5 and pins 3 and 6.
To operate in full-duplex mode, leave the jumpers in their factory default
locations, installed in the spare locations of 4-5 and 6-only. The drivers and receivers
are always enabled in full-duplex mode. Figure 23 shows how to select half- or
full-duplex operation.
WARN IN G:
When operating in half-duplex mode, the transmitter
drivers must be disabled before receiving any data.
Failure to do so may result in multiple active output
drivers being connected together, which may cause
damage to the board, the computer, and the external
device.
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Jumpers J6, J8
6
5
4
3
2
Tx ENABLE
Tx ENABLE
Tx ENABLE
Rx ENABLE
RTS
Half-Duplex(DTR) Operation
Half-Duplex(RTS) Operation
Full-Duplex Operation
1 DTR
3
6
5
4
Rx ENABLE
Tx ENABLE
Tx ENABLE
Tx ENABLE
2 RTS
1
3
DTR
6
5
4
Rx ENABLE
Tx ENABLE
Tx ENABLE
2 RTS
Tx ENABLE
1
DTR
Figure 23 --- Half- or full-duplex selection
AUXOUT
RS-422 or
RS-485
Driver
+
-
TXEN
6
5
3
2
RS-422 or
RS-485
Receiver
AUXIN
+
-
4
1
RXEN
XCLK
RTS
CTS
RCLK
DTR
DSR
DCD
RI
6
5
4
3
2
1
Figure 24 --- Output control block diagram
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8.6 Termination Resistors
Line termination resistors are provided for the input signals of each of the
DSC-200/ 300's RS-422/ 485 ports. Termination may be selected or removed for
individual signal lines using jumper blocks J1-J4.
RS-422
RS-485
Rt = 100 ohm 1/2W
Rt = 120 ohm 1/2W
RS-422/485 Receiver
+
RXD+
RXD-
AUXIN+
Rt
or
-
AUXIN-
Jumpers J1-J4
3
3
2
1
3
2
1
2
1
no termination
RS-485 termination
(120 omhs)
RS-422 termination
(100 ohms)
(factory default)
Figure 25 --- RS-422/ 485 Line termination resistance values
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8.7 RS-422/ 485 Peripheral Connection
The DSC-200/ 300 connects to peripheral equipment through two female D-9
connectors. The serial port connector definitions are listed in Figure 26.
SignalDescription
TxD+
D-9 Connector Pin
2
7
4
8
1
6
5
9
3
TxD-
RxD+
RxD-
AUXOUT+
AUXOUT-
AUXIN+
AUXIN-
GND
Figure 26 --- DSC-200/ 300 connector definitions
5
9
4
8
3
7
2
6
1
D-9 connector
(CN2 and CN3)
Figure 27 --- DSC-200/ 300 output connectors
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9 PCI Resource Map
Listed below are the PCI resources used by the DSC-200/ 300. Such information
may be of use to customers writing their own device drivers or other custom software.
A detailed description of the DSC-200/ 300's UARTs is available on the Quatech web
site.
(all numbers in hex)
PCI Vendor ID:
PCI Device ID:
PCI Class Code
0x135C
0x0030
Quatech, Inc.
DSC-200/ 300
Base class: 0x07
Simple communications controller
Multiport serial controller
Subclass:
Interface:
0x02
0x00
IRQ sourced by:
Base address 0:
Base address 1:
INTA#
0x80 bytes I/ O Reserved region
0x10 bytes I/ O Serial ports
Port 1 at offset 0x00
Port 2 at offset 0x08
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10Specifications
Bus interface
PCI, 32-bit bus, 5-volt only
IBM-compatible computers
Dimensions:
approx. 5.5" x 3.5"
Serial ports
Controller:
Interface:
16750 with 64-byte FIFOs
Two female D-9 connectors
Transceivers:
SP491 or compatible
Differential output:
2V min. with 50-ohm load (RS-422)
1.5V min. with 27-ohm load (RS-485)
Output rise/ fall time: 3ns min., 40ns max., 15ns typ.
Differential input
Threshold:
Input resistance:
Input current:
-0.2V min., +0.2V max.
12k ohm min., 15k ohm typ.
+/ - 1.0mA max.
Power requirements
+5
volts:
approx. 320 mA
Temperature:
operating 0° to 70°
storage -50° to 80°
Humidity:
10% to 90%
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11 Troubleshooting
Listed here are some common problems and frequent causes of those problems.
If the information here does not provide a solution, contact Quatech technical support.
Any unauthorized repairs or modifications will void the DSC-200/ 300's warranty.
Computer will not boot up.
1. Is the DSC-200/ 300 properly inserted? Remove the card and try again. Perhaps
try a different expansion slot.
2. Ensure that an ISA-bus card is not using the same IRQ that the PCI BIOS tries to
assign to the DSC-200/ 300. Most computers have BIOS setup options to reserve
IRQs for either ISA or PCI use. Try reserving the IRQ for the ISA card. The BIOS
will automatically choose a different IRQ for the DSC-200/ 300. An address
conflict is unlikely because most PCI-based computers will assign I/ O
addresses in such a way that they cannot conflict with ISA-bus devices.
3. The DSC-200/ 300 may be defective. Contact technical support for instructions.
Cannot communicate w ith other equipment.
1. Are the cable connections correct? Are the cables securely attached?
2. Is the software configured with the correct base address and IRQ information for
the DSC-200/ 300? (This is mainly a DOS issue.)
3. Is the device driver installed?
4. If you are trying to communicate with another DTE, a null-modem cable will be
required.
5. If possible, use a loopback connector to test the port.
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DSC-200/ 300
User's Manual
Revision 1.21
March 2004
P/ N: 940-0145-121
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