GE MDS SD Series Setup Manual page 4

4.0 COM1/COM2 REFERENCE
The COM1/COM2 connectors
connect an external DTE telemetry device to the radio, supporting
the RS-232 or RS-485 (balanced) format, depending on how the
radio is configured. The radio supports data rates of 300, 1200,
2400, 4800, 9600, 19200, 38400, 57600, and 115200 bps (asyn-
chronous data only) on these connectors.
These connectors mate with a standard DB-9 plug available from
many electronics parts distributors.
MDS SD Series Setup Guide
05-4847A01, Rev. D
July 2010 (Copyright 2010, GE MDS, LLC)
(Figure 11) are typically used to
Table 2: COM1/COM2 Pin Descriptions—RS-232
Pin Input/
Number Output
1 OUT
2 OUT
3 IN
4 IN
5 --
6 OUT
7 IN
8 OUT
9 --
NOTE: The radio is hard-wired as a DCE device.
5 1
9 6
4.0.1 Pin Descriptions—RS-232 Mode
Table 2 provides pin descriptions for the connector when operating
in RS-232 mode. For RS-422/485, refer to the Technical Manual.
Pin Description
DCD (Data Carrier Detect/Link)—A low on
this pin indicates signal received.
RXD (Received Data)—This pin supplies
received data to the connected device.
TXD (Transmitted Data)—This pin accepts
TX data from the connected device.
Sleep Mode Input—Grounding this pin
turns off most circuits in a remote radio.
This allows for greatly reduced power
consumption, yet preserves the radio's
ability to be quickly brought on line.
Signal Ground—This pin connects to
ground (negative supply potential) on
chassis.
Alarm Output (DSR)—An RS-232
high/space (+5.0 Vdc) on this pin indicates
an alarm condition. An RS-232 low/mark
(–5.0 Vdc) indicates normal operation. This
pin may be used as an alarm output.
Reserved.
Reserved.
User I/O for special applications; not
normally used.
Figure 11. COM1/COM2 Connector
(DB-9F)
As viewed from outside the radio
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