Garmin GTX 327 Installation Manual

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GTX 327 Installation Manual Page 25190-00187-02 Rev JBKLT SRCE (Backlight Source) (Auto Only)Selection DescriptionPHOTO (Photocell) DEFAULT. Backlight level is determined by the ambient light levelas measured by the photocell on the GTX 327.14V Backlight level tracks a 14 volt DC aircraft lighting bus.28V Backlight level tracks a 28 volt DC aircraft lighting bus.5V Backlight level tracks a 5 volt DC aircraft lighting bus.NOTEIf a lighting bus (any selection other than PHOTO) is selected, and thelighting bus control is turned to its minimum (daytime) setting, the displaybrightness 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, thebrighter 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 thepanel.3.3.3 KEY LIGHTING PageThe key lighting mode is always the same as the displaybacklight mode, so the mode must be changed on the DisplayBacklight configuration page. If the lighting mode is AUTO, then the key lighting parameters can beedited on this page.KEY (Key Lighting)Selection DescriptionMAN (Manual) Key lighting is controlled manually by the pilot on the GTX 327DISPLAY page.AUTO (Automatic) Key lighting is automatically controlled based on the parametersentered on this configuration page.LVL (Level)Shows the current level of key lighting, based on the lighting input source (lighting bus voltage, or theambient light if the source is PHOTO) and the settings on this configuration page. This field has a rangeof 0 (zero) to 999. The level is set by pressing the 8 and 9 keys when MAN mode is selected. When inAUTO mode, the field is for display only.KEY LIGHTING Page