Mocomtech CRS-300 - Manual (Page 169)

6–1
Chapter 6. CONNECTOR PINOUTS
6.1 CRS-230 Controller Connectors
6.1.1 IF Switch Control – DB-25M Connector
The DB-25M IF Switch Control connector is cabled directly to the
corresponding connector on the CRS-280 or CRS-350, if used. This
supplies power to the CRS-280/350, along with the logic interface
to drive the currently selected terrestrial modem, and to decide
whether the system is in bridged or backup mode. The CRS-280/350 performs the same bridging
and backing up functions of the Tx and Rx IF signals to match what the CRS-300 does to the
terrestrial data signals.
6.1.1: IF Switch Control Connector
6.1.4: System Alarms Connector 6.1.3: Remote Control Connector
6.1.2: 485 Pass-Through Connector