Installation guide

DMP-300 INSTALLATION GUIDE PAGE 7 OF 20
P/N DMP010 V3.0
3.3 Inputs
3.3.1 Dimmer
The vacuum-fluorescent display on the DMP-300 can be set to one of eight different levels of
brightness in Setup Mode. Alternatively, the brightness level may be selected via the external
dimmer input.
Three different inputs are provided for each of the three common types of dimmer busses: 0-
5VDC, 0-14VDC and 0-28VDC. Connect the aircraft dimmer signal to only one of these
inputs. The two remaining unused inputs must remain unconnected.
If an external dimmer input is to be used, enter Setup Mode (power up with the knob
depressed, release when the display first lights up) and rotate the knob until “Disp. Brightness”
is displayed. Push the knob repeatedly until <EXT. DIMMER> is displayed. To exit Setup
Mode, simply cycle the power.
The DMP-300 also provides the ability to calibrate the external dimmer input between
minimum and maximum brightness. To perform the calibration:
• Enter Setup Mode (power up with the knob depressed, release when the display first
lights up) and rotate the knob until “MIN Ext Dimmer” is displayed.
• The number displayed below the word MIN will track the external dimmer voltage,
while the number in parentheses shows the current saved value.
• Set the instrument panel dimmer to the lowest (dimmest) setting expected in normal
operation. On many aircraft, setting the panel dimmer fully “off” actually sets the panel
lighting to maximum brightness. Do not select this value for “MIN Ext Dimmer”. Make
sure to set the panel for the lowest amount of panel lighting without going to full
brightness. Press the knob to save this value on the DMP-300.
• Rotate the knob one click CW to display “MAX Ext Dimmer”. Set the instrument panel
dimmer to full brightness, and press the knob to save that value on the DMP-300.
After the calibration is performed, when<EXT. DIMMER> is selected as the brightness setting
the eight different levels of brightness will be evenly distributed between the MIN and MAX
values of external dimmer. The MN and MAX values must differ by at least 8, and the MIN
value must be less than MAX.
Setting the panel dimmer below the MIN value will cause the DMP-300 display to go to full
brightness. If this is not desired, then simply recalibrate the “MIN Ext Dimmer” to a lower
value.
Note: The factory default setting is for a fixed 100% brightness, with the dimmer input ignored.
3.3.2 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-300 display automatically “points” to
the next track on the memory card. Thus, the pilot can simply press the remote button