Comtech EF Data CRS-311, Installation And Operation Manual

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CRS-311 1:1 Redundancy Switch Revision 7
Appendix B MN/CRS311.IOM
B–2
B.1.2 CRS-230 “485 Pass-Through” Connector (DB-9F)
Table B ‐ 1 indicates the pinout for the CRS ‐ 230 “485 Pass ‐ Through”
connector. This connector is used only with the CDM ‐ Qx/QxL modems.
Table B-1. “485 Pass-Through” User Data Connector
Pin # Description Direction
1 Ground –
6 RS-485 Receive Data B (see Note) In
2 RS-232 Transmit Data Out
7 RS-485 Receive Data A (see Note) In
3 RS-232 Receive Data In
8 RS-485 Transmit Data B Out
4 Reserved - do not connect to this pin –
9 RS-485 Transmit Data A Out
5 Ground –
Note: Use for 2 ‐ wire RS ‐ 485 operation.
B.1.3 CRS-230 “Remote Control” Connector (DB-9M)
Table B ‐ 2 indicates the pinout for the CRS ‐ 230 DB ‐ 9M “Remote Control”
connector. This connector provides access to the remote control ports of
the CRS ‐ 311 for both EIA ‐ 232 and EIA ‐ 485.
Table B-2. “Remote Control” User Data Connector
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.