Fire Com 110, Installation & Operation Manual, Page: 10 / 20

8
SYSTEM WIRING
SETTINGS
Side View
Rx T/G Tx
Radio Connections
The mobile radio is connected to the intercom by using the radio port on the back of the unit. A MR interface
cable, with an un-terminated end, is supplied with the intercom. For independent wire descriptions, see
Appendix A.
Warning
To ensure proper operation, the connection to the radio should be performed by a qualified
radio technician.
Some radio specific interface cables are available for common model radios. For a list of interface cables, please
visit www.firecom.com and click on the Product Support section of our web site or contact our service department
at 800-527-0555.
When installing an MR cable, tighten the two screws on the plug of the cable.
Warning
If the screws are not properly tightened, the 9-pin plug may vibrate and cause problems with
transmission, reception, or other radio functionality.
Receive Audio Adjust Transmit Audio Adjust
Transmit Audio Gain Jump
Intercom Audio Gain Jump
Several adjustments to the 110 Radio Interface are required. When connecting to the mobile radio, it will be
necessary to make both transmit and receive audio adjustments.
Warning
These adjustments must be performed by a qualified radio technician. Failure to perform
these adjustments may result in problems hearing or transmitting radio signals when using
the intercom system.