
RCS20 M:N Redundancy Switch Revision 15
Electrical Interfaces MN-RCS20 and CD-RCS20
5–6
5.2.3.2 CPU Terrestrial I/O Card
Figure 5-5 CPU Terrestrial I/O Card
5.2.3.2.1 J1 | ALARMS
The J1 | ALARMS port is a 9-Pin Type D Female Connector. This port has relay contacts that trigger
various switch faults. This could be used to trigger an audio alarm.
1 Major Alarm - NC MJA-NC ---
2 Major Alarm - C MJA-C ---
3 Major Alarm - NO MJA-NO ---
4 No Connection N/C ---
5 No Connection N/C ---
6 No Connection N/C ---
7 Minor Alarm - NC MNA-NC ---
8 Minor Alarm - C MNA-C ---
9 Minor Alarm - NO MNA-NO ---
5.2.3.2.2 J2 | TERMINAL
The J2 | TERMINAL RS-232 Terminal Interface port is a 9-Pin Type D Female Connector. It can be used to
access switch functions via a dumb terminal or a user PC running a terminal emulator program (e.g.,
HyperTerminal, Tera Term, etc.) Modems cannot be accessed via this port.
1 No Connection N/C ---
2 Receive Data RxD Input
3 Transmit Data TxD Output
4 No Connection N/C ---
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