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Chapter 5: Settings
Imager
188 WORKABOUT PRO Hand-Held Computer With Windows Mobile 6 Classic & Professional User Manual
Max Gain, Max Integration And Max Illumination
Important: These parameter values should only be changed by qualified
Psion Teklogix personnel.
These parameters represent internal values used by the 2D imager. The “Auto
Exposure” parameter 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 allowable 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. “Decoder 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.
Note: When decoding multiple bar codes in one image, the value assigned to
‘Decoder Timeout’ should be increased to 200ms/extra bar code after the first.
Adaptive Windowing
“Adaptive Windowing” is an advanced technique used to speed up bar code
recognition in certain applications. This parameter automatically reduces the size of
the window to the user-programmed window size when it successfully decodes
(which reduces decode time the next time it is used), but increases it to the full size
window on a failed decode.
Note: This feature assumes that you have reached an understanding about how
the device operates in your application, and that, after a learning period,
operators will get used to using the imager in one particular way. It also
assumes that a trained operator will usually only have near miss scenarios.