Casio IT-800 Series Software Manual page 12

The functions of the System Library relevant to the Backlight Brightness are as follows.
SysGetBLBattery
SysSetBLBattery
SysSetBLExpower
SysGetBLExpower
SysGetBLMaximum : Retrieves the maximum value of brightness for the backlight.
Backlight Auto Dimming
The brightness at the Control Panel can be used to set up whether or not the Auto Dimming
function is used and the waiting time until when dimming begins. The auto dimming is set effect
only when the power is provided by the lithium-ion battery pack. It will not activate when an
external power supply is used.
• If the terminal is left unused in idle state - absolutely no key input is made - while the power is
turned on, the backlight will be automatically dimmed to save the power after a given period
of time has been elapsed.
• While the terminal is being in the auto dimmed state, pressing key disables the auto dimming
function and then resumes the ordinary brightness.
• While the Auto Dimming function has been set effect, the brightness can be set in one of eight
grades. The default is 3. During the Auto Dimming function being set effect, the brightness
cannot be set any brighter than the brightness illuminated by the backlight. The defaults are
"Enable the auto dimming function" and "1 minute" for waiting time period until when the
Auto Dimming function activates.
Auto Backlight OFF
The brightness at the Control Panel can be used to set up whether or not the Auto Backlight OFF
function will be used and the waiting time until when the Auto Backlight OFF function activates.
The Auto Backlight OFF function is operable for both when the power is provided by an external
power source and when it is provided by the lithium-ion battery pack.
• If the terminal is left unused in idle state - absolutely no key input is made - with the power
being turned on, the backlight will be automatically turned off to save the power.
• When the terminal is in the Auto Backlight OFF state, pressing a key disables the Auto
Backlight OFF function and resumes the ordinary brightness.
• While the power is being provided by the lithium-ion battery pack and both the Auto
Dimming function and the Auto Backlight OFF function have been set effect, either one of the
functions with preset time period shorter than the other will have the priority. The default is
"Enable the Auto Backlight OFF function" and "5 minutes for the waiting time" until when
the Auto Backlight OFF function activates.
: Retrieves brightness of the screen when the power is supplied by battery
pack.
: Sets up brightness of the screen for the power source supplied by battery
pack.
: Sets up brightness of the backlight for the power source supplied by
external power.
: Retrieves brightness of the backlight when the power is supplied by
external power.
12