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Keypad Window Backlight
The keypad face contains a Room Light Sensor that au-
tomatically measures the ambient light level to determine
if the keypad Window backlight needs to be turned on for
a few seconds after a keypad button press. A lit back-
light ensures the Window contents are displayed clearly
in a dark room. In a bright room, the backlight is not
needed and thus remains off to save battery power (see
page 5, "Window" and "Room Light Sensor"). The Room
Light Sensor threshold can be adjusted as well as ena-
bled/disabled, as follows:
Enable/Disable Threshold
If you want the backlight to turn on for a few seconds af-
ter every keypad button press, regardless of the light lev-
els, the threshold can be changed from its factory ena-
bled setting to disabled. Note: Disabling the threshold
will adversely affect keypad battery life. To summarize:
Enabled = LE = Default = Backlight off in bright room
Disabled = Ld = Backlight on after every button
press
1. Press and hold the keypad AREA (
appears in the Window.
2. Press 5, ENTER.
If LE appears ("Level enabled"), the threshold is ena-
bled; to disable, press ENTER (Ld will appear).
18
K E Y P A D W I N D O W B A C K L I G H T
) button until "LF"
If Ld appears ("Level disabled"), the threshold is disa-
bled; to enable, press ENTER (LE will appear).
Adjust Threshold
The threshold level uses an scale from "L1" (decreases
sensitivity to trigger the backlight at a brighter light level)
through "L10" (increases sensitivity to trigger the back-
light at a darker light level). Factory default is "L5".
To adjust the threshold sensitivity:
1. Press and hold the keypad AREA (
appears in the Window.
2. Press 2 and "F2" appears. After a moment, the "L"
number that appears is the current threshold level.
In a dark room with the backlight not turning on when
it should, press STAY to raise the sensitivity level.
In a bright room with the backlight turning on unnec-
essarily, press AWAY to lower the sensitivity level.
Notice that as you adjust the level, the backlight will turn
on or off at the current ambient light level. When fin-
ished, press ENTER to set.
Note: As described earlier in the Enable/Disable
Threshold section on this page, the threshold must
be enabled ("LE"); or else any adjustments to the
threshold level will not affect backlight operation.
) button until "LF"
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