Comtech EF Data RRS11 - Manual (Page 23)

RRS11 Solid-State Transfer Switch Operation
MN-RRS11 3–5
Rev. 3
An additional 9-Pin D-Sub Connector is supplied for switch monitoring. The I/O on this connector
comes from a Form-C relay. The pinouts for the monitor connector is listed in Table 3-3.
Table 3-3. Switch Online Statue Pinout
Pin No. Signal Name Description
4 Signal Ground Switch GND
1 Relay 1 NO Relay Normally Open Contact
(Closed When the Backup Modulator is On-Line)
3 Relay 1 NC Relay Normally Closed Contact
(Closed When the Prime Modulator is Online)
2 Relay 1 C Relay Common Contact
7 Relay 2 NO Relay Normally Open Contact
9 Relay 2 NC Relay Normally Closed Contact
8 Relay 2 C Relay Common Contact
5 NC ---
6 NC ---