User's Manual

14221-1200-4010, Rev. B
17
A 3-wire Controller Area Network (CAN) cable provides radio-to-control head(s) interconnection. One
end of the CAN cable connects to a CAN port on the rear of the Unity mobile radio unit (MRU) and the
other end connects to a CAN port on the rear of the control head. Between the radio and the control head,
the CAN link carries digitized microphone and speaker audio and controlling data such as button presses
and radio messages. For proper operation, the CAN link must be terminated appropriately on each end.
The control head provides the user/operator interface for the XG-100M Unity mobile with its companion
XG-100LPA VHF Low Band Power Amplifier.
Figure 3-1: Simplified Block Diagram Unity Low Band PA
3.3.2 CH-100 Control Head
The CH-100 control head features a 4.3-inch touch screen high-contrast sunlight-readable LCD color
display, providing an easy-to-use menu-driven operator interface. The front panel of the CH-100 head
features an easy-to-use on/off/volume control and group/channel selection controls, an emergency button,
a home button, a USB programming port, a transmit/receive busy indicator, and a microphone connector.
The CH-100 also features a Bluetooth
®
wireless interface for connection of optional equipment and it
provides support for radio and control head programming via the wireless connection.
The front panel of the CH-100 is shown in Figure 10-1 on page 56 and its rear panel is shown in Figure
10-2. Connectors located on the rear panel include a DC power connector, two (2) CAN port connectors
used for CAN link interconnections, an external speaker connector, a 9-pin serial port connector for
connecting optional equipment such as a mobile data terminal, and a 25-pin multi-function accessory
connector.
3.3.3 CH-721 Control Head
The CH-721 control head, shown in Figure 10-4, features a large 3-line graphical vacuum-fluorescent
display, front panel controls, and buttons for user control of the mobile radio, an internal high-power
audio amplifier to drive an externally-connected speaker, and a front panel microphone connector. It