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Decode Search Mode
There are two selectable decode (scanning) modes:
Full Omnidirectional
- Searches for barcode features beginning at the center
of an image, and searches to the image’s limits. This mode reads all symbolo-
gies (including OCR), in any orientation. The Full Omnidirectional search is
very thorough which may slow performance time.
Note: This search mode is the default setting for the image scanner.
Quick Omnidirectional
- This is an abbreviated search for barcode features
around the center region of an image. This mode quickly reads all symbologies
in any orientation. The Quick Omnidirectional mode may miss some off-center
symbols, as well as larger Data Matrix and QR Code symbols.
Preferred Symbology
Note: Does not apply to OCR.
The 4820/4820i can be programmed to specify one symbology as a higher pri-
ority over other symbologies in situations where both bar code symbologies
appear on the same label, but the lower priority symbology cannot be disabled.
For example, you may be using the imager in a retail setting to read UPC sym-
bols, but have occasional need to read a code on a drivers license. Since some
licenses have a Code 39 symbol as well as the PDF417 symbol, you can use
Preferred Symbology to specify that the PDF417 symbol be read instead of the
Code 39.
Preferred Symbology classifies each symbology as high priority, low priority,
or as an unspecified type. When a low priority symbology is presented, the
imager ignores it for a set period of time (see Preferred Symbology Time-out on
page 4-14) while it searches for the high priority symbology. If a high priority
symbology is located during this period, then that data is read immediately.
If the time-out period expires before a high priority symbology is read, the
imager will read any bar code in its view (low priority or unspecified). If there is
no bar code in the imager’s view after the time-out period expires, then no data
is reported.
Note: A low priority symbol must be centered on the aiming pattern to be read.
Full Omnidirectional
Quick Omnidirectional