Unitech PA500 Programming Manual

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6.4. LCD/Backlight related function
There are two backlight controls, screen backlight and keypad backlight. They are
controlled separately. For screen backlight, you can adjust brightness of backlight also.
6.4.1. Screen Backlight Control
Function Description:
This function turns screen backlight on or off.
Function call:
void BacklightOn(BOOL fON)
Parameter(Input)
fON: BOOL: TRUE = turn on screen backlight.
FALSE= turn off backlight.
Return code:
6.4.2. Get Screen Backlight Status
Function Description:
This function returns the status of screen backlight.
Function call:
BOOL GetBacklightStatus(void)
Return code:
TRUE = screen backlight is on.
FALSE = screen backlight is off.
6.4.3. Screen Backlight Brightness Control
Function Description:
This function adjusts screen backlight brightness.
Function call:
void BrightnessUp(BOOL fup)
Parameters(Input)
Fup: BOOL: TRUE = adjust one step up.
FALSE = adjust one step down.
Return code:

Unitech PA500 Specifications

System Memory

SDRAM	64 MB
Flash ROM	64 MB

Display

display resolution	240x320 QVGA
display type	Color Transflective TFT
touch screen	yes

Laser Bar Code Scanner

scan rate	104 scans/sec ± 12 scans/sec
scan angle default	47°±3°
scan angle reduced	35°±3°

Power

main battery voltage	3.7 V
main battery capacity	2200 mAh
rechargeable time	3.5 hours

Operating Environment

operating temperature	32°F to 122°F (0°C to 50°C)
storage temperature	-4°F to 140°F (-20°C to 60°C)
relative humidity	5% ~ 95% (non-condensing)

Weight and Dimensions

weight with battery and scan engine	Under 213 g
length	126 mm
height	23 mm