Comtech EF Data CRS-500 - Manual (Page 201)

CRS-500 1:N Redundancy System Revision 2
Appendix B MN-CRS500
B–3
B.2.1.1 CRS-530 “P1 | Remote Control” Connector (DB-9M)
The DB-9M “P1 | Remote Control” connector provides both EIA-232 and
EIA-485 access to the remote control ports of the CRS-500.
Table B-1. P1 | Remote Control Connector Pinouts
Pin # Description Direction
1 Ground –
6 EIA-485 Receive Data B (see Note) In
2 EIA-232 Transmit Data Out
7 EIA-485 Receive Data A (see Note) In
3 EIA-232 Receive Data In
8 EIA-485 Transmit Data B Out
4 Reserved - do not connect to this pin –
9 EIA-485 Transmit Data A Out
5 Ground –
Note: Use for 2-wire EIA-485 operation.