14
Serial/Ethernet/USB Communication (SCOM) Interface
IND100084-18
SCOM Section: Brightness
In SCOM protocol, there are five brightness related commands, which define the backlight/LED brightness value and
their adjustable range.
LCD Brightness
: Full range of LCD backlight.
System Brightness
: Full range of system level brightness.
User Brightness
: Variation range of User level.
- BRI: Minimum backlight brightness.
- BRM: Maximum backlight brightness.
- BRT: Backlight brightness.
- BRU: User backlight brightness.
BRI
and
BRM
value define the min & max boundary of the visual backlight brightness.
BRT
gives the global backlight
brightness value. However,
BRT
should be the value between
BRI
and
BRM
.
BRU
is the user backlight control which presents the user controlled brightness value. This value is linked with
potentiometer (when POT is valid). The adjustable scale for BRU value is 0 ~ 255. The corresponding PWM steps
behind BRU, is framed by BRI and BRT. The visual variation range for BRU is from BRI to BRT. The BRU steps are
scaled down into 255 by the value between BRI and BRT.
Illustration: Brightness Logic
