TM840 DMR Mobile Radio Quick User Guide
12
external alarm device (light or speaker) connected to GPIO to
alarm.
4 Basic Operation
4.1 Powering On/Off the Radio
In the power off status, long press the Radio On-Off button to power on the mobile. The power
on screen will be shown, backlight will light and the power on alert will be heard.
In the power on status, long press Radio On-Off button until power off screen is shown to power
off the mobile.
4.2 Selecting a Zone
A Zone is a group of channels exhibiting the same property, allowing users quickly switch from a
channel group to a different channel group. The radio can be set to have up to 248 zones, each with
a maximum of 128 channels.
You may select a zone through the following way:
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