190-01182-02 GTR 225/GNC 255 TSO Installation Manual
Rev. F Page 6-4
6.4.1.3 Intercom Enable Page
Intercom mode is enabled or disabled on the INTERCOM ENABLE page. See table 6-2 for available
selections.
Figure 6-4 Intercom Enable Page
Table 6-2 Intercom Enable Page Selections
6.4.1.4 Backlight Page
The BACKLIGHT page selects the source for the display and bezel key lighting. Minimum brightness
levels of the display and key are also configured on the BACKLIGHT page.
Figure 6-5 Backlight Page
The display source is configured to track either photocell or lighting bus 1. The bezel key source is
configured to track the photocell, lighting bus 1, or lighting bus 2. See table 6-3 for description of
selections on the BACKLIGHT page.
Table 6-3 Backlight Selections
The minimum brightness level of the display and bezel keys is configurable on the BACKLIGHT page.
This sets the minimum brightness of the bezel keys or display. The display minimum brightness level has a
range from 1 to 100. The default level is 1. The bezel key minimum brightness level has a range from 0 to
100. The default level is 1.
Selection Description
DISPLAY
Allows the intercom to be enabled or disabled via a menu option on the GTR/GNC
display. After selecting DISPLAY, the intercom enable/disable setting will appear in
normal mode.
DISCRETE
Selecting DISCRETE allows the intercom to be enabled or disabled via a remote
switch connected to the INTERCOM ENABLE* discrete input (P2001-12). This
selection will remove the menu option to enable/disable the intercom.
Selection Description
PHOTOCELL
Backlight or bezel key lighting level is determined by the ambient light level as
measured by the photocell on the GTR/GNC.
LIGHT BUS 1 Backlight or bezel key levels track the lighting bus 1 levels.
LIGHT BUS 2 Bezel key lighting levels track the lighting bus 2 levels.
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