Connector Pinouts - Comtech EF Data SMS-758 Installation And Operation Manual

SMS-758 Modem Protection Switch

4.6.1.2 Connector Pinouts

A 37-pin female D connector provides interface for the RS-422/449 and
MIL-STD-188-114/RS-449 interface.
Screw locks provide mechanical security for the mating connector.
Signal Ground
Send Data
SD-B
Send Timing
ST-B
Receive Data
RD-B
Request To Send
RS-B
Receiver Timing
RT-B
Clear To Send
CS-B
Data Mode
DM-B
Receiver Ready
RR-B
Terminal Timing
TT-B
Master Clock
MC-B
Modulator Fault
Demodulator Fault
Note: MF and DF inputs are only on the prime and backup modem interface connectors,
not the terrestrial data connector.
MN/SMS758 Rev. 3
Signal Function Name
SG
SD-A
22
ST-A
23
RD-A
24
RS-A
25
RT-A
26
CS-A
27
DM-A
29
RR-A
31
TT-A
35
MC-A
34
MF
DF
Pin #
1,19,20,37
4
5
6
7
8
9
11
13
17
16
3
21
Theory of Operation
4–13