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GENERAL INFORMATION
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.
FEATURES
• "Carrier Sense" automatically detects presence of received signal
on the line
• Ideal for UNIX and similar environments where host needs to
receive a carrier signal before sending a "log-on" screen to a
terminal
• Allows troubleshooting of a line: loss of carrier indicates problem at
remote connection
• Full Duplex operation over coax or a single twisted pair.
• Data rates to 19,200 bps
• Range to 1 mile.
• No AC power required: draws necessary power from RS-232
signals.
• External DCE/DTE switch
DESCRIPTION
The Model 1003 is a Carrier Sense Short Range Modem that connects
computers and terminals over a single coax or single twisted pair cable.
The Model 1003 derives necessary power for operation from the data
and control voltages on the RS-232 interface.
The Model 1003 with "carrier sense" is ideal for UNIX and other
environments in which the host requires a carrier detect signal on pin 8
before it sends a "log-on" screen to the terminal. The carrier sense
feature works like this: The Model 1003 monitors its received line.
When a signal is received from the line, pin 8 (CD) tells the host to send
a "log-on" screen to the terminal. If the received signal is lost or
interrupted, the carrier detect signal is held low to the host. The Model
1003's carrier sense feature makes it ideal for trouble shooting in non-
UNIX applications as well.
The Model 1003S is a surge protected version of the Model 1002 that
uses the latest in bi-directional, clamping, transient suppressors to
protect itself and connected equipment against harmful transient
discharges. For surge handling capability, the Model 1003S is
compliant with IEC 801.5 level 2, 1kV.
3
CONFIGURATION
Configuring the DTE/DCE Switch. Terminals (DTEs) want to "talk" to
modems (DCEs), not to other terminals. This is because terminals and
modems talk to each other on complementary pins. Terminals talk on
pin 2, while modems talk on pin 3. Similarly, terminals listen on pin 3,
while modems listen on pin 2.
The DTE/DCE switch on the Model 1003 determines whether the Model
1003 "thinks" it's a modem (DCE) or a terminal (DTE). If you are
connecting the Model 1003 to a terminal or PC, set the switch to DCE.
If you are connecting the Model 1003 to a modem or multiplexer, set
the switch to DTE.
DCE/DTE
Switch
Terminal
Block
DCE
INSTALLATION
General Instructions. The Model 1003 is intended for point-to-point
communication over a single coax or one-pair cable. Two Model 1003's
are needed for each communication link: one at each end of the cable.
Please be sure that the cable you use has no equalizers, conditioners,
or other equipment installed that could affect the signal passed between
the two Model 1003s--they need dry, unconditioned metallic cable.
4
Surge
Suppressors
(1003S only)
DTE
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