Avionics Innovations DMP-200 (MP3 Player) Installation Manual - Manual (Page 7)

DMP-200 INSTALLATION MANUAL PAGE 7 OF 18
P/N DMP8012-00 REV E
3.3 Inputs
3.3.1 Remote Pause/Play Button
An external input is provided which can either emulate the front panel pushbutton, or can
be used only to pause or resume playback. When set to “Edge-Activated”, the
Remote
Pause/Play input going active will immediately pause or resume the playback of any
audio track in progress. In addition, if the knob has been turned so that a desired track is
displayed (i.e. “queued up”), activating the Remote Pause/Play input will cause the track to
begin playing. In these situations, the remote Pause/Play performs exactly like the front
panel pushbutton.
This is especially useful in single-pilot helicopter applications. If the remote pushbutton is
mounted on or near the cyclic, the pilot can control the audio without releasing the flight
controls. After playback of each audio track, the DMP-200 display automatically “points” to
the next track on the memory card. Thus, the pilot can simply press the remote button
after each track to initiate playback of the next audio track.
The Remote Pause/Play input can be configured in Setup Mode as active high or active
low. It can also be configured as either an “edge-activated” or a “level-activated” signal:
• Edge-Activated
When set to “edge-activated” (the default setting), the remote pushbutton works
exactly like the front panel knob. Pause/Play function is toggled each time the
signal changes from inactive to active, and new track playback may be started
from the remote pushbutton as well. For example, if set up as Active Low, the
Pause/Play will toggle each time a grounding pushbutton is pressed. Releasing
the button has no effect.
• Level-Activated
This setting is intended for use when the remote Pause/Play input is connected to
a cabin PA system’s KEY signal, to momentarily pause the DMP-200 playback
while the PA is in use. If a track is playing, the DMP-200 will be PAUSED for as
long as the Pause/Play signal is active, and will resume playing when the signal
returns to inactive. If the DMP-200 is either idle or paused when the remote
Pause/Play signal changes, it has no effect.
Like the discrete trigger inputs, Remote Pause/Play is floating and must be pulled up or
down with an external resistor, depending on the desired active state. The input signal
may vary between 0V and 35 VDC: levels above 3.5 VDC will be interpreted as “high”,
while levels below 3.5 VDC will be “low”.
When Edge-Activated is selected, the Remote Pause/Play input works in parallel with the
front panel knob – playback may be paused via one and resumed via the other. Unlike
the front panel knob, however, playback mode cannot be cancelled by holding the Remote
Pause/Play input active.