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Power Connections
Power is wired to the intercom using the power supply cable with in-line fuse (included). When routing the
power cable, the in-line fuse should be easy to access.
Warning
Before making power connections, make sure the power source is turned off.
Important
Use a dedicated ground for the (-) power connection. Do not ground to the chassis.
Important
We recommend connecting the intercom power to the same power busses as the 2-way radio.
CA Cable Routing
There are several important considerations when routing the CA cable:
• Do not bundle extra cable. The cable should be cut to length at installation, especially when radios
are used.
• Route CA cables away from hot surfaces including vehicle exhaust systems.
• When routing CA cables through bulkheads or other sheet metal, use a grommet in the hole to
prevent damage to the cable.
• A radio transmit priority "PR" port is identified on the front of the intercom. When a radio is connected
to the system, the intercom user on this port will have priority when transmitting over the radio.
Other users will not be able to transmit over the radio while this user is transmitting.
Headset Module Installation
The following steps are recommended for installing a HM-10 or PP-20 headset module.
• Identify where the headset module is to be mounted and use the module as a template to locate
the two mounting holes as shown in figure above. Drill two holes for the #6 hardware provided.
• If you are installing a PP-20 module, route the CA cable as outlined in "CA Cable Routing" on this
page and install an RJ-12 connector at the intercom end of the cable as outlined in Appendix B
"RJ-12 Connector Assembly." Always make sure the printed side of the cable is facing the
release tab on the RJ-12 modular plug. If you are installing an HM-10 module continue with the
following steps.
6
SYSTEM WIRING
HM-10
PP-20
- Quick Links:
- Appendix A-Wiring Diagrams
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