User`s guide

External Trigger Operation
The ProHold 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 top panel accepts a mono or stereo mini-plug, as shown in
the illustration below.
When the plug is inserted, the unit automatically switches to 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 con-
tacts 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 opera-
tion; 5V DC indicates the unit has stopped playing the message. (Note: the signal is for mon-
itoring purposes only and can not be used to directly operate external equipment.)
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