Psion Teklogix 7545 User Manual page 244

Appendix C: Bar Code Settings
Imager
Imager Advanced Options
Auto Exposure
Important: This parameter value should only be changed by qualified Psion Teklogix
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
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, inte-
gration and illumination.
Max Gain, Max Integration And Max Illumination
Important: These parameter values should only be changed by qualified Psion
These parameters represent internal values used by the 2D imager. The "Auto Exposure" pa-
rameter automatically adjusts the Max Gain, Max Integration and Max Illumination
parameters to produce the best bar code read. Keep in mind that "Auto Exposure" must be
set to on in order for these parameter values to be automatically adjusted.
Double-tapping on any of these parameters displays an associated dialog box in which an al-
lowable range is displayed: Max Gain – 357 to 7920, Max Integration – 0 to 65535,
Max Illumination – 0 to 7.
Decoder Timeout
The decoder is a set of algorithms that examine the image and attempt to find the bar codes,
and then turn the pixels into data that the computer can use—this process takes time. "De-
coder Timeout" limits the amount of time the decoder will spend attempting to decode an
image, and forces it to stop and grab a new image, which will probably be easier to decode.
C-44 Psion Teklogix 7545 Hand-Held Computer User Manual
Preliminary Draft 3
personnel. It should be left at the default value: on.
Teklogix personnel.