Horner APG RX371 OCS HERX371C101 - Manual (Page 70)

CH.11 MAN0924-01-EN
February 8, 2010 Page 70 of 124 # 1018
11.11 Screen
Saver
The RX-371 screen backlight life is typically 5 years when in continuous use. If the application does not
require interaction with the RX-371 for long periods of time, the backlight life can be extended by using
the screen saver function. When enabled through the system menu, the backlight is shut off (screen goes
black) after a specified time of no touch activity on the screen. When the screen saver shuts off the
backlight, any operator touch on the screen or function keys reactivates the backlight.
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 RX-371. Any additional touch activity
is also ignored by the RX-371 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.
11.12 Screen
Brightness
The RX-371 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 if and how to present a Screen Brightness control to the user.
Note that backlight life may be shorted when screen is dimmed or screen brightness is varied on a
repetitive basis.