User's Manual

Chapter 6: Configuration
Imager – Advanced Options
Warrington Hand-Held Computer User Manual 169
Min Scan Duration
This parameter defines the minimum amount of time in seconds that the imager will scan
when the trigger is pressed and held down without successful decode.
Captures Per HW Trigger
The value assigned to this parameter determines the number of captures the imager device
will take while the imager's internal hardware trigger is held down.
Auto Exposure
Setting this parameter to on allows the imager to make automatic gain, integration and illu-
mination 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
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, inte-
gration and illumination.
Note: The actual scan duration when the trigger is pressed relies on the value assigned to
“Captures Per HW Trigger”, below.
Note: This parameter, together with “Min Scan Duration”, determines the actual scan
duration. When the scan trigger is pressed and held down, the driver starts a timer
based on the value of “Min Scan Duration” and also sends a command to emulate
the hardware trigger. When completed, if the time has not yet expired, it will send
another command to the imager device, forcing the imager to flash again using the
value assigned to “Captures Per HW Trigger”.
Important: This parameter value should only be changed by qualified Psion Teklogix
personnel. It should be left at the default value: on.
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.
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