Avionics Innovations DMP-100 (MP3 Player) Installation Manual User Manual
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DMP-100 INSTALLATION GUIDE
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P/N DMP010 V1.7
3.4.2 Discrete
Two discrete outputs are provided for interfacing external equipment. BUSY and CHIME
are both open-collector outputs capable of sinking 1 Amp each. Maximum input voltage is
35 VDC on each.
By default, BUSY is active anytime the DMP-100 is producing audio. However, the
installer may configure BUSY to go active only for speech tracks, only for music tracks, for
all types of tracks, or even to never go active at all. BUSY can be used to drive an audio
switching relay, enable an external amplifier, or even to light a remote annunciator.
If “Dedicated Annunciator Mode” is enabled for Triggers 1, 2 and 3, then BUSY has a
different function. In this mode, BUSY is one of the three separate annunciators that
indicate when Triggers 1, 2 or 3 are currently playing.
CHIME goes active when a speech track has been selected or triggered, but the actual
playback does not begin until CHIME goes inactive. The length of time CHIME remains
active is selected in Setup Mode. CHIME can be used to enable an external chime or
tone generator, to annunciate the fact that a speech message is about to begin. CHIME
does not go active when a music track has been selected.