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RRS11 Solid-State Transfer Switch
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.
Pin No.
Signal Name
4
Signal Ground
1
Relay 1 NO
3
Relay 1 NC
2
Relay 1 C
7
Relay 2 NO
9
Relay 2 NC
8
Relay 2 C
5
6
MN-RRS11
Rev. 3
Table 3-3. Switch Online Statue Pinout
(Closed When the Backup Modulator is On-Line)
(Closed When the Prime Modulator is Online)
NC
NC
Description
Switch GND
Relay Normally Open Contact
Relay Normally Closed Contact
Relay Common Contact
Relay Normally Open Contact
Relay Normally Closed Contact
Relay Common Contact
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Operation
3–5
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