Comtech EF Data SMS-458B - Manual (Page 33)

SMS-458B Modem Protection Switch Revision 2
Installation MN/SMS458B.IOM
2–7
2.3.2 Remote Interface (J1, J2, J3)
The remote interface connectors provide serial remote interface to the switch.
For external control of the switch, an external controller can connect through J1
(EIA-485) or J2 (EIA-232).
The prime and backup modems connect to the switch through J3 (EIA-485), the modem
control interface connector. This connector provides a bus-type control interface,
required for system operation.
The remote interfaces connectors are 9-pin female D connectors, with screw locks for
mechanical security. The remote connector is a DCE interface.
EIA-485 EIA-232
Pin # Name Pin # Name
1 GND 1 N/C
2 N/C 2 RD (RX)
3 N/C 3 TD (TX)
4 +RX/TX 4 N/C
5 -RX/TX 5 GND
6 N/C 6 N/C
7 N/C 7 N/C
8 +RX/TX 8 N/C
9 -RX/TX 9 N/C
2.3.3 Online Status (J4, J5)
Connectors J4 and J5 provide the output for the modulator and demodulator backup
online status in form-C format.
J4 is for the modulator online status and J5 the demodulator online status.