Decode Search Mode; Preferred Symbology - Hand Held Products 2020 User Manual

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 symbologies
(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.
Full Omnidirectional
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.
Quick Omnidirectional

Preferred Symbology

Note: Does not apply to OCR.
The 4820/4820i can be programmed to specify one symbology as a higher
priority 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
symbols, 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 4-16) 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.
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