Key Lighting Page - Garmin GTX 327 Installation Manual

BKLT SRCE (Backlight Source) (Auto Only)
Selection
PHOTO (Photocell)
14V
28V
5V
If a lighting bus (any selection other than PHOTO) is selected, and the
lighting bus control is turned to its minimum (daytime) setting, the display
brightness will track the GTX 327 photocell.
SLOPE (Auto Only)
Sets the sensitivity of the display brightness to changes in the input level. The higher the number, the
brighter the display will be for a given increase in the input level. This field has a range of 0 (zero) to 99,
and is set to 50 at the factory.
OFFSET (Auto Only)
Adjusts the lighting level up or down for any given input level. This field has a range of 0 (zero) to 99,
and is set to 50 at the factory. This may also be used to match lighting curves with other equipment in the
panel.

3.3.3 KEY LIGHTING Page

The key lighting mode is always the same as the display
backlight mode, so the mode must be changed on the Display
Backlight configuration page. If the lighting mode is AUTO, then the key lighting parameters can be
edited on this page.
KEY (Key Lighting)
Selection
MAN (Manual)
AUTO (Automatic)
LVL (Level)
Shows the current level of key lighting, based on the lighting input source (lighting bus voltage, or the
ambient light if the source is PHOTO) and the settings on this configuration page. This field has a range
of 0 (zero) to 999. The level is set by pressing the 8 and 9 keys when MAN mode is selected. When in
AUTO mode, the field is for display only.
GTX 327 Installation Manual
190-00187-02
Description
DEFAULT. Backlight level is determined by the ambient light level
as measured by the photocell on the GTX 327.
Backlight level tracks a 14 volt DC aircraft lighting bus.
Backlight level tracks a 28 volt DC aircraft lighting bus.
Backlight level tracks a 5 volt DC aircraft lighting bus.
NOTE
Description
Key lighting is controlled manually by the pilot on the GTX 327
DISPLAY page.
Key lighting is automatically controlled based on the parameters
entered on this configuration page.
KEY LIGHTING Page
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