Comtech EF Data SNM-1001 - Manual (Page 26)

SNM-1001 Network Control Modem Installation
Rev. 1 2–5
2.3.1.1 EIA-422/449 Interface Connector Pinouts
The EIA - 422/449 interface is provided on a 37-pin female D connector accessible on the
rear panel of the modem. Screw locks are provided for mechanical security of the mating
connector.
Signal Function Name Pin #
Send Data SD-A
SD-B 4
22
Send Timing ST-A
ST-B 5
23
Receive Data RD-A
RD-B 6
24
Request to Send EIA-A (See Note)
EIA-B (See Note)
7
25
Receiver Timing RT-A
RT-B 8
26
Clear to Send CS-A (See Note)
CS-B (See Note)
9
27
Data Mode DM-A
DM-B 11
29
Receiver Ready RR-A
RR-B 13
31
Terminal Timing TT-A
TT-B 17
35
Master Clock (input) MC-A
MC-B 16
34
Demod Fault – 21
Mod Fault – 3
Signal Ground SG 1, 19, 20, 37
Note: The EIA and CS lines are jumpered together on the demod/M&C card
(AS/4973-2), since the modem does not support polled operation.