GE MDS 4790M Installation And Operation Manual page 26

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Table 3. Data Interface Pinouts
Pin Number Input/Output
1 --
2 IN
3 OUT
4 IN
5 OUT
6 OUT
7 --
8 OUT
9 IN
10 OUT
11 OUT
12 IN
13 --
14 --
15 OUT
16 --
17 --
18 IN/OUT
19 OUT
20 --
21 OUT
22 --
23 IN
24 --
25 OUT
MDS 4790M (MPT 1411) I/O Guide
Pin Description
Shield Connection. Connects to ground (negative
supply potential) on the radio's PC board.
TXD—Transmitted Data. Accepts TX data from the
connected device.
RXD—Received Data. Outputs received data to the
connected device.
RTS—Request-to-Send Input. Keys the transmitter
when RTS asserted.
CTS—Clear-to-Send Output. Active after the
programmed CTS delay time has elapsed.
DSR—Data Set Ready. Provides a +6 V dc DSR
signal through a 2.5 kΩ resistor.
Signal Ground. Connects to ground (negative supply
potential) at radio's PC board.
DCD—Data Carrier Detect. Goes active when the
radio detects an on-frequency signal.
No Connection
No Connection
Receive Audio Monitoring Connection (used for
diagnostics). Drives high-impedance load.
No Connection
No Connection
No Connection
Do not connect—Reserved for future use.
No Connection
Do not connect—Reserved for future use.
No Connection
14.0 V dc Output. Provides a source of regulated
voltage at 1.5 amperes for low-power accessories.
No Connection
No Connection
No Connection
No Connection
Do not connect—Reserved for future use.
No Connection
MDS 05-3628A01, Rev. B