APM Test mode
In test mode, the Chime and Microphone of the APM can be
tested and the volume for can be adjusted.
The test mode can be entered by holding the PTT (Push To Talk)
button when powering up (connecting the RJ45 connector).
After the Test mode is entered, the "PTT" button will illuminate
Orange while the "Select All", the "Deselect All", the "Chime"
and the "Mic" buttons will illuminate green.
After pressing the "Chime" button, the volume for the Chime
can be increased and decreased by pushing the "+" and "-"
buttons. To test if the selected volume is correct, you can press
the orange "Test" button, whereafter the chime tone will be
heard.
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