Horner-apg QX351 OCS HEQX351C103 Manuel d'utilisateur télécharger pdf (Page 68)

CH.11 MAN0892-03-EN

February 25, 2010 Page 68 of 109 # 1039

11.11 Screen Saver

The QX351 screen backlight life is typically 5 years when in continuous use. If the application does not

require interaction with the QX351 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 QX351. Any additional touch activity

is also ignored by the QX351 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 QX351 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.

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Horner-apg QX351 OCS HEQX351C103 Manuel d'utilisateur Page 68