User manual

Chapter 5: Configuration
Options – Imager
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Psion Teklogix 7535/7530 Hand-Held Computer User Manual
5.10.5.1 Options – Imager
Dot Time (msec)
The value selected for “Dot Time (msec)” determines (in milliseconds) how long
the targeting dot remains on before the scanner switches to a normal scan sweep.
When you double-tap on this parameter, a dialog box is displayed in which you can
enter a value of between 0 and 3000. A value of 0 disables the target dot.
Center Bar Code Only
Note: This parameter must be disabled when reading Composite bar codes.
When more than one bar code is visible in a single snap shot, this parameter allows
you to specify that only the centre image within the imager framing marker be read.
When this parameter is set to on, the target dot is pointed at the centre image and
only that image is returned.
Auto Exposure
Important: This parameter value should only be changed by qualified Psion
Teklogix personnel. It should be left at the default value – ‘on’.
Setting this parameter to on allows the imager to make automatic gain, integration
and illumination adjustments based on ambient light before capturing the bar code.
If the adjustment is insufficient, further adjustments are made automatically before
another image is captured.
Fast Converge
Note: “Auto Exposure” must be set to ‘on’ in order for this parameter
to function.
Keep in mind that while this parameter can improve imager performance,
“Fast Converge” increases battery power consumption.
Setting this parameter to on speeds the “Auto Exposure” process. It allows the
imager to rapidly snap a number of bar code capture attempts while finding ideal
values for gain, integration and illumination.