User`s guide

SkyTrac Systems Ltd.
Document Rev. 01.007 DOC0102 Page 16 of 23
Restricted Proprietary and Confidential Information
The exception is when the voltage falls below a configured minimum threshold, and the
optical sensor indicates a bright cabin, then the backlights and LEDs will be set to maximum
brightness. This feature ensures that during bright daylight when the dimmer bus is off, the
Display and indicators are at their maximum brightness.
The threshold at which this occurs can be configured at the “Dimmer Threshold” menu
option. Setting the Dimmer Threshold to 0 disables the daylight mode behaviour, and this
may be desirable for certain conditions. The user can also vary the relative ambient
brightness required to trigger a daylight response via the “Daylight Threshold” menu option.
4.4.3.3 Manual Mode
Manual Mode overrides the brightness control for the indicators, backlight brightness, and
the LED display until the next power-up or until control is switched back to either the optical
sensor or dimmer bus mode by menu selection.
Manual Mode Menu has two options, brighter or dimmer. Select the desired action as many
times as desired until required brightness levels are reached. The relative brightness value
within the range of 1 – 15 is indicated on the display when manual brightness is adjusted.
4.4.3.4 Configure Bright/Dim Control
4.4.3.4.1 Optical Sensor Gain
The behaviour of the Optical Sensor Mode brightness can be customized by adjusting the
Optical Sensor Gain. The Gain value can be changed from the System > Brightness >
Configure > Opt Sensor Gain Menu. A value between 0 – 99 can be specified for the
Optical Sensor Gain.
When using Optical Sensor Mode:
- If the display is too dim for flying conditions increase the Optical Sensor Gain.
- If the display is too bright for flying conditions, decrease the Optical Sensor Gain.
When adjusting the optical sensor gain, ensure the display brightness is appropriate for low
light conditions as well as bright daylight conditions. Adjusting the Optical Sensor Gain
towards maximum, results in the display reaching its’ maximum brightness below maximum
ambient lighting conditions.
Increasing the Optical Sensor Gain when the ambient lighting is bright may result in no
brightness level changes at the current ambient lighting level (system already at maximum
brightness), but increased brightness at dimmer ambient light levels may occur.
4.4.3.4.2 Daylight Thresh
The “Daylight Threshold” provides the option to increase or decrease the ambient light level
of the cabin that is required for the CDP-250 to switch to full brightness if the voltage on the
dimmer bus falls below the Dimmer Threshold. This value is relative, with 1 being the
dimmest and 9 being the brightest.