Standard selection buttons:
The standard selection buttons are the three buttons on the bottom row of the APM keypad (only
for APM104, APM108 and APM116). These buttons are fixed and not configurable.
Push to talk: Announcements can be made after the push-to-talk button is pressed. In
standard configuration, a chime tone will always be heard prior to any
announcement.
Select all: Selects all the buttons which are configured as a ‘zone select’, allowing them
to be addressed instantly for announcements. Buttons will illuminate when
selected.
Clear: De-selects all the buttons which are configured as a ‘zone selects’