AT&T DMOH
Optional External Trigger Operation
External Trigger Operation is not required for most AT&T MOH
Applications
The unit can be set for single-play operation, activated by an external trigger. (Note:
the PLAY LED on the front panel illuminates only during digital playback.)
The TRIG mini-jack on the rear panel accepts a mono or stereo mini-plug, as shown
in the illustration below. When the plug is inserted, the unit automatically switches
to the single-play mode. (If the trigger is inserted during the playback, the message
will play through to the end and then stop.)
The external trigger offers two modes of operation: If the contacts are closed and
then opened within 5 five seconds, the message will play completely and then stop
(any further contact closure action at the trigger is ignored until the playback is
complete). If the contacts are closed for more than five seconds, playback will stop
when the contacts are opened and the unit will return to its idle state.
If a stereo mini-plug is used, the middle ring and barrel provides 0V DC or 5V DC
level which can be used to indicate unit status: The 0V DC level indicates digital
playback operation; 5V DC indicates the unit has stopped playing the message.
(Note: the signal is for monitoring purposes only and can not be used to directly
operate external equipment.)
