1-2 overview
3.0 GM380/GM1280 Models (GCN6121_)
The Controlhead contains the on/off/volume knob, the microphone connector, several buttons to 
operate the radio, several indicator Light Emitting Diodes (LED) to inform the user about the radio 
status, and a Liquid Crystal Display (LCD) with 21 pre - defined symbols and a 32*96 dot matrix for 
graphical or alpha - numerical information e.g. channel number, select code, call address name. To 
control the LED’s and the LCD, and to communicate with the host radio the control head uses the 
Motorola 68HC11K4 microprocessor.