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2 connector pinouts – Comtech EF Data SMS-758 User Manual

Page 73

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SMS-758 Modem Protection Switch

Theory of Operation

MN/SMS758 Rev. 3

4–13

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 Function

Name

Pin #

Signal Ground

SG

1,19,20,37

Send Data

SD-A

4

SD-B

22

Send Timing

ST-A

5

ST-B

23

Receive Data

RD-A

6

RD-B

24

Request To Send

RS-A

7

RS-B

25

Receiver Timing

RT-A

8

RT-B

26

Clear To Send

CS-A

9

CS-B

27

Data Mode

DM-A

11

DM-B

29

Receiver Ready

RR-A

13

RR-B

31

Terminal Timing

TT-A

17

TT-B

35

Master Clock

MC-A

16

MC-B

34

Modulator Fault

MF

3

Demodulator Fault

DF

21

Note: MF and DF inputs are only on the prime and backup modem interface connectors,
not the terrestrial data connector.

See also other documents in the category Comtech EF Data Equipment: