Comtech EF Data STS11/STS11L User Manual
Page 22
STS11/STS11L Solid-State Transfer Switch
Revision 0
Operation
MN-STS11-11
3-4
Table 3-3. Switch Control Pinout
Pin No.
Signal Name
Direction
Description
5
Signal Ground
Input
Modulator GND
9
Backup Select
Output
One modulator is designated as Backup. This line
is tied low on the Backup Mod Control connector.
1
+DC
Input
+12V DC Power
2
nPrime_Sel
Input
Forces On-Line Output to Prime
7
nBackup_Sel
Input
Forces On-Line Output to Backup
8
Fault-In
Input
Fault Output From Modulator
4
Fault-Out
Output
Connects to Fault-In Monitor on Modulator
3
Switch-State
Output
Switch State Monitor.
Logic '1' = Prime Online
6
NC
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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 3-4.
Table 3-4. Switch Monitor 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
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6
NC
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