Honeywell 2020 - Manual (Page 70)

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Example: If you have two barcodes next to one another and the centering
window is set to 40% left edge and 60% right edge, only the
barcode that intersects that window will be decoded.
Preferred Symbology
The 3820/3820i 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 3-9) 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.
Scan a bar code below to enable or disable Preferred Symbology.
20%
30%
90%
80%
40% 60%
70%
10%
0% 100%
Decoded barcode
* Preferred Symbology Off
Preferred Symbology On