Backlight - Honeywell MX9 Reference Manual

Backlight

The backlight settings use the default timeouts and is synchronized to the User Idle setting in the Schemes tab in the Power
control panel. When the backlight timer expires, the touch screen backlight is dimmed, not turned off. When both checkboxes
are unchecked, the backlight never turns off (or dims). Default values are 3 seconds for Battery, 2 minutes for External and
both the check boxes are enabled.
When the keypad backlight is set to Follow the touch screen backlight, the keypad backlight turns off when the touch screen
backlight dims.
Adjust backlight brightness by moving the slider. Changes are in effect immediately.
Touch screen display backlight brightness adjust mode is entered by pressing the Blue + Scan key combination.
After this, the up and down arrow keys brighten or dim the backlight. Pressing any key other than up arrow or down arrow exits
the brightness adjustment mode.
Additional characteristics:
There is no separate brightness level indication except for the actual brightness of the display.
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Once the maximum (or minimum) brightness is reached by repeated presses of the up (or down) key, the display will
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cease getting brighter (or dimmer) and saturate at that maximum (or minimum brightness).
Continuously pressing the up or down arrow keys does not cause an automatic repeat of the up (or down) arrow key.
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The brightness setting is stored in the registry and is recalled at power on.
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The number of steps from maximum brightness to minimum dimness is five. At minimum dimness level, the display is
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still viewable.
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