USER
MANUAL
MODEL 1020
and 1020S
Synchronous Short
Range Modem with
Transformer Isolation
Part #07M1020-C
Doc. #041011UC
Revised 4/20/98
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
C
E
R
T
I
F
I
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An ISO-9001
Certified Company
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2.0 GENERAL INFORMATION
3.0 CONFIGURATION
Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at (301) 975-1007.
The Model 1020 provides four configuration switches which allow
selection of RTS/CTS delay and data rates. This section describes
switch locations and explains all possible switch configurations.
3.1 SWITCH LOCATIONS
2.1 FEATURES
For your convenience, all configuration switches are located on a
SIP (single in-line package) mounted on the PC board. Figure 1 shows
the location of the SIP with respect to other PC board components. For
instructions on opening the Model 1020 case, see Section 4.1.2.
• Supports point-to-point data rates from 1.2 to 19.2 Kbps
• Internal, crystal controlled clock
• Transformer isolation guards against ground looping
• Range to 11 miles
Patton
VLSI chip
Terminal Block
• Full duplex operation
X X X X
P E 0 6 8
N O T P A T
• Custom VLSI chip with separate filter for each data rate
• No AC power or batteries required
• Miniature size
Isolating
Transformers
Control
• High speed surge protection (Model 1020S only)
Switches
2.2 DESCRIPTION
The Patton Electronics Model 1020 miniature, synchronous short
range modem uses the latest in VLSI technology to combine high-
quality data transmission with compact size. The Model 1020 does not
require any AC power or batteries to operate, and communicates up to
11 miles in point-to-point environments.
Figure 1. Model 1020 PC board showing switches
Figure 2 shows the orientation of the configuration switches,
including the ON/OFF position.
Supporting full duplex transmission over two twisted pairs, the
Model 1020 has a crystal controlled internal clock. Data rates are
switch selectable from 1200 to 19,200 bps. The Model 1020’s custom
VLSI chip uses a separate filter for each data rate, rather than a single
“compromise” filter. Transformer isolation allows the Model 1020 to
operate between buildings without data disruption due to ground
potential differences.
OFF
1
2
3
4
ON
Figure 2. Close-up of configuration switches
The Model 1020S is a surge protected version of the Model 1020,
incorporating Silicon Avalanche Diodes that provide 600 watts of
protection per wire.
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4.0 INSTALLATION
3.2 SWITCH SETTINGS
Once the Model 1020 is properly configured, it is ready to connect
to your system. This section tells you how to properly connect the
Model 1020 to the twisted pair and RS-232 interfaces, and how to
operate the Model 1020.
All possible settings for the Model 1020’s configuration switches
are presented in the summary table and descriptions below. If you
have additional questions regarding configuration, contact Patton
Technical Support at (301) 975-1007.
4.1 CONNECTION TO THE TWISTED PAIR INTERFACE
SWITCH SUMMARY TABLE
Position
Switch 1
Switch 2
Switch 3
Switch 4
Function
RTS/CTS delay
Data Rate
Factory Default
The Model 1020 supports data-only communication between two
RS-232 devices at distances to 11 miles and data rates to 19.2 Kbps.
There are two essential requirements for installing the Model 1020:
On
On
Off
Off
7 mSec delay
Data Rate
9,600 bps
1. These units work in pairs. Therefore, you must have one Model
}
1020 at each end of a two twisted pair interface.
Data Rate
2. To function properly, the Model 1020 needs two twisted pairs of
metallic wire. These pairs must be unconditioned, dry, metallic
wire, between 19 and 26 AWG (the higher number gauges may
limit distance somewhat). Standard dial-up telephone circuits, or
leased circuits that run through signal equalization equipment, are
not acceptable.
Switch 1: RTS/CTS Delay
After request to send (RTS) is raised by the host terminal, the
1020/1020S raises CTS after a slight delay in order to give the remote
terminal time to receive an incoming signal. Depending on the type of
environment, either a 7mS or 53mS delay can be selected.
For your convenience, the Model 1020 is available with three
different twisted pair interfaces: RJ-11 jack, RJ-45 jack and terminal
blocks with strain relief.
Switch 1
On
Setting
7 mS
Off
53 mS
4.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45
Switches 2, 3 and 4: Data Rate
The RJ-11 and RJ-45 connectors on the Model 1020’s twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:
Switches 2 thru 4 are set in combination to allow the Model 1020 to
be used at data rates from 1.2 Kbps up to 19.2 Kbps.
Switch 2
On
On
On
Off
On
Off
Off
Off
Switch 3
On
On
Off
On
Off
On
Off
Off
Switch 4
On
Off
On
On
Off
Off
On
Off
Setting
1.2 Kbps
2.4 Kbps
4.8 Kbps
7.2 Kbps
9.6 Kbps
14.4 Kbps
19.2 Kbps
19.2 Kbps
RJ-11
SIGNAL
RJ-45
SIGNAL
1...................GND†
2...................RCV‡
3...................XMT
4...................XMT
5...................RCV
6...................GND
1 .................N/C
2 .................GND†
3 .................RCV‡
4 .................XMT
5 .................XMT
6 .................RCV
7 .................GND
8 .................N/C
†Connection to ground is optional
‡The Model 1020 is not polarity sensitive
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1. Open the unit by gently inserting a screw driver between the
DB-25 connector and the lip of the plastic case (see below).
You don’t have to worry about breaking the plastic, but be
careful not to bend the D-sub connector.
When connecting two Model 1020s it is necessary to use a
“crossover” cable. The diagram below shows how a crossover cable
should be constructed for an environment where both Model 1020s use
a 6-wire RJ-11 connector. Similar logic should be followed when using
RJ-45 connectors or a combination of the two.
SIGNAL PIN#
COLOR
COLOR PIN#
SIGNAL
GND†
RCV‡
XMT
XMT
RCV
GND
1
2
3
4
5
6
Blue◊.................White
Yellow ..............Red
Green...............Black
Red..................Yellow
Black................Green
White ...............Blue
6
4
5
2
3
1
GND
XMT
RCV
RCV
XMT
GND
†Connection to ground is optional
◊
Standard color codes—yours may be different
‡The Model 1020 is not sensitive to polarity
1 - Blue
2 - Orange
3 - Black
4 - Red
1 - Blue
2 - Yellow
3 - Green
4 - Red
5 - Green
6 - Yellow
7 - Brown
8 - Slate
5 - Black
6 - White
Once the unit has been opened, you will be able to see the
terminal blocks located at the rear of the PC board.
Standard AT&T color codes
4.1.2 TWISTED PAIR CONNECTION USING TERMINAL BLOCKS
2. Strip the outer insulation from the twisted pairs about one inch
from the end.
If your application requires you to connect two pairs of bare wires
to the Model 1020, you will need to open the case to access the
terminal blocks. The instructions on the following pages will tell you
how to open the case, connect the bare wires to the terminal blocks,
and fasten the strain relief collar in place so that the wires won’t pull
loose.
3. Strip back the insulation on each of the 2 twisted pair wires
about .25”.
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4. Connect one pair of wires to the two XMT (transmit) poles on
the terminal block, making careful note of which colors you
use. The Model 1020 is not polarity sensitive, so either wire
may connect to either pole.
8. Place the 2 halves of the strain relief assembly on either side
of the telephone wire and press together very lightly. Slide the
assembly so that it is about 2 inches from the terminal posts
and press together firmly. If your cable diameter is too small
or too large for our strain relief, please contact our technical
support. We have strain relief assemblies to accommodate
most cable diameters.
5. Connect the other pair of wires to the two RCV (receive) poles
on the terminal block, making careful note of which colors you
use. The Model 1020 is not polarity sensitive, so either wire
may connect to either pole.
Ultimately, you will want to construct a two pair crossover
cable that makes a connection with the two Model 1020s as
shown below:
XMT
XMT
G
RCV
RCV
RCV
RCV
G
XMT
XMT
One Pair
One Pair
}
}
To Shield (Optional)
6. If there is a shield around the telephone cable, it may be
connected to “G” on the terminal block. To avoid ground
loops, we recommend connecting the shield at the computer
end only. A ground wire is not necessary for proper operation
of the Model 1020.
9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and set it
into the recess in the case.
7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:
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APPENDIX A
SPECIFICATIONS
10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.
Transmission Format: Synchronous, full duplex
Transmission Line: Two unconditioned twisted pair 19 - 26 AWG
Range: (See table below)
Interfaces: EIA RS-232, CCITT V.24
Data Rates: 1200 - 19.2 Kbps
Isolation: Minimum 1500 V RMS via custom transformers
11. Insert one captive screw through a saddle washer and then
insert the entire piece through the hole in the DB-25 end of the
case. Snap that side of the case closed. Repeat the process
for the other side. This completes cable installation.
Surge Protection: 600W Surge Protection (10x1000µs waveform)
(Model 1020S)
Control Signals: CTS turns on 7 or 53 mS (switch selectable)
after the terminal raises RTS; DSR and DCD are constantly on
4.2 CONNECTION TO THE RS-232 INTERFACE
Connectors: DB-25 male or female on RS-232 side;
RJ-11, RJ-45 or terminal block with strain relief on line side
Once you have connected the twisted pair wires correctly, simply
plug the Model 1020 directly into the DB-25 port of the RS-232 device.
After doing so, remember to insert and tighten the two captive
connector screws.
Power Supply: None required; uses power from EIA data and
control signals
Temperature Range: 0-60°C (32-140°F)
Altitude: 0-15,000 feet
(Note: If you must use a cable to connect the Model 1020 to the
RS-232 device, make sure it is a straight through cable of the shortest
possible length—we recommend 6 feet or less).
Humidity: Up to 95% non-condensing
Weight: 2 oz.
4.3 OPERATING THE MODEL 1020
Once the Model 1020 is properly configured and installed, it should
operate transparently—as if it were a standard cable connection.
Operating power is derived from the RS-232 data and control signals;
there is no “ON/OFF” switch. All data signals from the RS-232 interface
are passed straight through. All control signals from the RS-232
interface are looped back.
Dimensions: 2.66” x 2.10” x 0.73”
Model 1020 Distance Table (miles)
Wire Gauge
Data
Rate
19
7.5
10.0
10.0
10.0
11.0
24
3.5
3.5
7.0
8.5
8.5
26
2.5
2.5
4.0
5.0
6.0
NOTE: If your system requires hardware flow control, you will
need the Patton Model 1030 or Model 1070 Short Range Modem.
Call Patton Customer Service at 301-975-1007 for more
information.
19,200
9,600
4,800
2,400
1,200
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APPENDIX B
RS-232 PIN CONFIGURATIONS
DIRECTION
“DCE” STANDARD SETTING
DIRECTION
1- (FG) Frame Ground
To Model 1020
To Model 1020
Transmitter Timing - 15
Receiver Timing - 17
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
To Model 1020
From Model 1020
To Model 1020
From Model 1020
From Model 1020
To Model 1020
Data Term. Ready (DTR) - 20
8- (DCD) Data Carrier Detect From Model 1020
Copyright © 1998
Patton Electronics Company
All Rights Reserved
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