User Manual

XL7 User Manual
Note that when the screen saver is active (backlight shut off), any initial touch activity on the screen (or
function key) to reactivate the backlight is otherwise ignored by the XL7. Any additional touch activity is
also ignored by the XL7 for approximately one second thereafter.
It is possible for the application to temporarily disable the screen saver by generating a positive
transition to %SR57.16 (coil only) at a rate faster than the screen saver timeout value. This may be
desired while waiting for alarm acknowledgement.
13.11 Screen Brightness
The XL7 provides a feature that allows screen dimming for night operation. To enable this feature, the
application must access and control system register %SR57 (Display Backlight Brightness). Screen
brightness is continuously variable by driving %SR57 through the range of 100 (full bright) to 0 (full off).
It is left to the screen designer on how to present a Screen Brightness control to the user, if required.
NOTE: the backlight life may be shorted when screen is dimmed or screen brightness is varied on a
repetitive basis.
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