Honeywell 2020-5B User Guide - Page 72

Example: If you have two bar codes next to one another and the centering window is set to 40% left edge and 60% right edge, only the bar code that intersects that window will be decoded. Decoded bar code 10% 0% 20% 30% 40% 60% 70% 80% 90% 100% 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. Preferred Symbology On * Preferred Symbology Off 3 - 8