Installation Instructions

GTN 6XX/7XX AML STC Installation Manual 190-01007-A3
Page 5-24 Rev. 4
Minimum Level
This sets the minimum brightness of the keys or display. Touch the ‘Minimum Level’ key corresponding
to either the Keys or the Display to adjust the minimum brightness. The minimum brightness level can be
adjusted in a range from 0.05% to 100.00% when tracking the lighting bus, and from 0.14% to 100.00%
when tracking the photocell, with 100.00% being the maximum brightness level. The default minimum
display brightness level when tracking the lighting bus is 0.05%. The default minimum display brightness
level when tracking the photocell is 0.14%. The default minimum bezel key brightness level is 0.00%.
5.5.1.6.1 Photocell Configuration Page
The photocell configuration page, shown in Figure 5-11, is
reached by touching Configure Photocell on the lighting
configuration page , shown in Figure 5-10. This page allows
configuration of the photocell parameters listed below.
Response Time
Sets the speed with which the key or display brightness
responds to the input level (bus voltage or ambient light)
changes. The higher the number the slower the display
responds. This field has a range of two to seven seconds, and
is set to two seconds as a default value.
Slope
Sets the sensitivity the brightness of the display or keys has to
changes in the input level. Adjusting the slope higher will
result in a brighter display for a given increase in the input
level. This field has a range of 0 to 100, and is set to 50 as the
default setting.
Offset
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 as a default value. This may also be used to match lighting curves with other equipment in
the panel.
5.5.1.6.1.1 Photocell Override Options
Key Backlight Cutoff
This parameter configures the point at which key backlighting is switched off in bright light. For example,
a value of 70% results in the key backlights being turned off at photocell source input levels above 70%.
This field has a range of 0 (zero) to 100% and is set to 80% as the default setting.
Photocell Transition
When a lighting bus is used to control the lighting of the display, this parameter sets the point on the
lighting bus control below which the display brightness tracks the GTN’s photocell. This field has a range
of 5 to 50, and is set to 25 as the default setting.
5.5.1.6.2 Lighting Bus Configuration Page
The Lighting Bus Configuration page offers the same Response Time, Slope, and Offset adjustments as
described in Section 5.5.1.6.1.
Figure 5-11. Photocell
Configuration Page