USER
Part# 07M1202-A
Doc# 049012UA
Revised 7/5/95
MANUAL
MODEL 1202
High Speed Synchronous
Modem Eliminator
SALES OFFICE
(301) 975-1000
TECHNICAL SUPPORT
(301) 975-1007
1.0 WARRANTY INFORMATION
2.0 GENERAL INFORMATION
Patton Electronics warrants all Model 1202 components to be free
from defects, and will—at our option—repair or replace the product
should it fail within one year from the first date of shipment.
This warranty is limited to defects in workmanship or materials, and
does not cover customer damage, abuse or unauthorized modification.
If this product fails or does not perform as warranted, your sole recourse
shall be repair or replacement as described above. Under no condition
shall Patton Electronics be liable for any damages incurred by the use
of this product. These damages include, but are not limited to, the
following: lost profits, lost savings and incidental or consequential
damages arising from the use of or inability to use this product. Patton
Electronics specifically disclaims all other warranties, expressed or
implied, and the installation or use of this product shall be deemed an
acceptance of these terms by the user.
1.1 RADIO AND TV INTERFERENCE
The Model 1202 generates and uses radio frequency energy, and if
not installed and used properly—that is, in strict accordance with the
manufacturer’s instructions—may cause interference to radio and
television reception. If the Model 1202 does cause interference to radio
or television reception, which can be determined by disconnecting the
unit, the user is encouraged to try to correct the interference by one or
more of the following measures: moving the computing equipment away
from the receiver, re-orienting the receiving antenna and/or plugging the
receiving equipment into a different AC outlet (such that the computing
equipment and receiver are on different branches).
1.2 SERVICE
All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Service at (301) 975-1007.
Packages received without an
RMA number will not be accepted.
Patton Electronics’ technical staff is also available to answer any
questions that might arise concerning the installation or use of your
Model 1202. Technical Service hours: 8AM to 5PM EST, Monday
through Friday.
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 Customer Service at (301) 975-1007.
2.1 FEATURES
• Synchronous data rates to 512 Kbps
• Cable runs to 75 feet on each side of device
• Constant or RTS controlled carrier selections
• RTS-CTS delay options of 0mS or 6.6mS
• DB-25 connector on each end
• Half or full duplex
• Internal or external clocking
• No external power required
• LEDs monitor data and control signals
2.2 DESCRIPTION
The Patton Model 1202 high speed synchronous modem
elimnator allows two synchronous RS-232 DTE (host) devices to
communicate with each other without the need for expensive
synchronus modems. Supporting selectable data rates of 16, 32, 64,
128, 256 and 512 Kbps, the Model 1202 needs no AC power or
batteries for operation. The Model 1202 provides internal or external
clock options and operates half or full duplex. To emulate dial-up or
dedicated service, the delay between RTS and CTS can be set to either
0mS or 6.6mS. The carrier can be configured either as “constantly on”
or “controlled by RTS”.
Measuring only 5.3” x 2.0” x 1.2”, the Model 1202 is equipped with
a DB-25 connector on each end. Cable runs up to 75 feet on either
side of the device (150 feet total) are possible at the optimum data rate
of 64 Kbps. Tri-state LED indicators that monitor receive data, request
to send and data carrier detect on each side of the device.
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3.0 CONFIGURATION
Data Rate
Carrier Detect
Port 1
Port 2
224 kbps
112 kbps
56 kbps
28 kbps
14 kbps
7 kbps
External Clock
Port 1
Port 2
0 mSec
6.6 mSec
Constant
Port 1 Frame
Ground connects
to signal ground
Port 2 Frame
Ground connects
to signal ground
RTS/CTS Delay
Ground
Controlled
Data Rate
Carrier Detect
Port 1
Port 2
512 kbps
256 kbps
128 kbps
64 kbps
32 kbps
16 kbps
External Clock
Port 1
Port 2
0 mSec
6.6 mSec
Constant
Port 1 Frame
Ground connects
to signal ground
Port 2 Frame
Ground connects
to signal ground
RTS/CTS Delay
Ground
Controlled
Figure 1. Strap settings for the Model 1202
The Model 1202 is equipped with four strapping options that allow
configuration to a wide range of applications. To gain access to the
internal straps, loosen the hex nuts on the DB-25 connectors and pry
open the case between the plastic shell ears. Figure 1 shows the
location of each strapping option.
3.1 DATA RATE
The data rate strap controls the rate at which data is transmitted.
Adjust the strap to select one of the following options: 16, 32, 64, 128,
256 or 512Kbps, or external clocking. If “external clocking” is selected,
the Model 1202 will automatically match the clocking between your two
synchronous devices. The default setting is 64 Kbps.
3.2 CARRIER DETECT
The carrier detect straps allow you to determine whether the carrier
is “constantly on” or “controlled by RTS”. By adjusting the strap, you
may operate in switched carrier, multi-point and/or hardware
handshaking applications. Port 1 and port 2 may be configured
separately. The defaults setting is ON for both ports.
3.3 RTS/CTS DELAY
The RTS/CTS delay straps determine the amount of delay
between the time the Model 1202 “sees” RTS and when it sends CTS.
In order to emulate either dial-up or leased line modems, you can set
this strap at either no delay or 6.6mS. Port 1 and port 2 may be
configured separately. The default setting is 6.6mS for both ports.
3.4 GROUND
The ground strap setting connects the protective ground from port
1 or 2 to the Model 1202’s signal ground. The default setting is port 1.
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4.0 INSTALLATION
TD
RTS
CD
75 foot Cable
75 foot Cable
Model
1202
Sync. Host Sync. Host
5.0 OPERATION
The Patton Model 1202 is very simple to install.
1. Configure according to the instructions listed in Section 3.0.
2. Turn off the computer or device to which the Model 1202 is to be
connected.
3. Plug the DB-25 connectors directly into the serial ports of your
RS-232 devices. If you wish to extend the distance, you may add
a cable not to exceed 75 feet on each side.
Once you have configured the Model 1202 properly (see Section
3.0) and plugged it into your equipment, you are ready to operate the
unit. After the Model 1202 is properly 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.
5.1 LED Status Indicators
The Model 1202 features six front panel status LEDs that indicate
the condition of the modem eliminator and the communication link. The
diagram below shows the location of each of these LEDs. Following
the diagram is a description of each LED’s function.
• “TD” and “RTS” indicators blink with data activity.
• “CD” lights for an incoming signal on the line side and the resulting
output signal on the RS-232.
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APPENDIX A
Patton Model 1202
Block Diagram
SPECIFICATIONS
Data Rates: Strap selectable for 16, 32, 64, 128, 256 or 512 Kbps
Clocking: Strap selectable for Internal or external clock
Grounding: Protective ground (pin 1) may be strapped to signal
ground (pin 7)
Range: 75 feet on either side (for a total of 150 feet) at 64 Kbps,
range extends linearly for lower bit rates and decreases for higher
bit rates
Functional: Emulates half or full duplex, dial-up or dedicated line
RTS/CTS Delay: Selectable per port: 0mS or 6.6mS
DCD: Selectable per port as continuous or RTS controlled
Ring Indicator: Constantly ON
Interface: EIA RS-232C/CCITT V.24
Connectors: Choice of two male or two female DB-25 RS-232
connectors
APPENDIX B
BLOCK DIAGRAM
Power Supply: None required
Altitude: 0 to 10,000 feet
Humidity: Up to 95% non-condensing
Dimensions: Approximately 5.3” x 2” x 1.2”
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