Avionics Innovations DMP-200 (MP3 Player) Installation Manual - Manual (Page 9)

DMP-200 INSTALLATION MANUAL PAGE 9 OF 18
P/N DMP8012-00 REV E
3.3.3 Dedicated Annunciators for Triggers 1, 2 and 3
In some applications, it may be desirable to install dedicated pushbuttons for certain
tracks. For example, pushbuttons could be labeled “Takeoff Briefing”, “Turbulence
Briefing” and “Landing Briefing.” A dedicated annunciator can be installed with each
button and can be configured to illuminate whenever the corresponding audio track is
playing. This configuration, called Dedicated Annunciator Mode, is selected in Setup.
Note that when using this mode, the BUSY and CHIME outputs are used to drive two of
the annunciators, and their normal output functions are not available. See the Setup
description on page 13.
3.3.4 Outputs
3.3.5 Audio
The DMP-200’s stereo audio and mono outputs are ground-referenced, line-level signals
with a typical signal level of 1.8 V p-p. If isolation is required, an audio isolation
transformer such as a Triad SP-50 or a Magna-Tek TY-141P must be provided externally.
Volume level is selected from the front panel by the user, and stereo balance is selectable
from setup mode.
3.3.6 Discrete
Two discrete outputs are provided for interfacing external equipment: CHIME and BUSY.
CHIME is provided for interfacing to an external chime tone generator. CHIME is an open-
collector output capable of sinking 1 Amp, with a maximum input voltage of 35 VDC.
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.
By default, BUSY is active anytime the DMP-200 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. This
selection is done in SETUP mode.
NOTE: if Dedicated Annunciator Mode is selected, both CHIME and BUSY are redefined
to be trigger annunciators. In this mode, neither the CHIME nor the BUSY output
functions described above will be available.