Avionics Innovations DMP-300 (MP3 Player) Installation Manual - Manual (Page 10)

DMP-300 INSTALLATION GUIDE PAGE 10 OF 20
P/N DMP010 V3.2
configured to illuminate whenever the corresponding audio track is playing. This configuration
is selected in Setup mode. See the Setup description on page 15.
3.3.6 GPS Data
The DMP-300 can receive RS-232 or RS-422/485 serial data from panel-mount GPS
receivers. This feature allows an audio track to be assigned to a latitude/longitude trigger via
the CardPrep software.
The GPSIN pin should be connected to either the GPS receiver’s RS232 out pin, or to RS-422
“Data HI” or RS-485 “Data B”. The GPS DATA IN pin will accept either TTL level signals (0-
5VDC) or RS-232 level signals (-10 to +10 VDC).
The DMP-300 is compatible with the data from most models of Garmin, and Honeywell (Allied
Signal/Bendix-King) panel-mount receivers.
3.4 Outputs
3.4.1 Audio
The DMP-300’s stereo audio 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.
3.4.2 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-300 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.