2 cpu terrestrial i/o card, 1 j1 | alarms, 2 j2 | terminal – Comtech EF Data RCS20 User Manual
Page 106
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.
Pin No.
Signal Name
Signal
Direction
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.
Pin No. Signal Name Signal Direction
1
No Connection N/C
---
2
Receive Data
RxD
Input
3
Transmit Data TxD
Output
4
No Connection N/C
---