Motorola MTM800 Product Information Manual page 202

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22.5.3 Accessory Connector Ext Mic Source
This is used to select the audio input to the terminal.
Ext_Mic_Audio - This selects the external mic audio from the externally connected mic. The DC
impedance is 600 ohms and the AC impedance is 560 ohms.
Tx_Audio - This selects the audio from the control head mic. This has an impedance >10k ohms
and an input level of 775mV rms.
23 Display Parameters
The options available within these sub menus are used for the terminal's display configuration.
23.1 Display Options
The available options in this sub menu are used to configure the appearance of the display.
23.1.1 Backlight Toggling
Selecting the Field Value down arrow will display the following four options:
Disable - Selecting this option disables the display backlight.
Manual - If this option is selected, a button must be programmed for backlight control to enable the
user to turn the backlight on/off.
6866537D87-F Chapter 3 - MTM800 Product Information Manual
Customer Programming Software (CPS)
September 2008