Upc/Ean Predecode Block - Symbol LS 6000i Product Reference Manual

LS 6000i Series Product Reference Guide

UPC/EAN Predecode Block

UPC/EAN bar codes are made up of two blocks
representing "left" and "right" halves. For example, bar
code 1234567890 is divided into left block "12345", and
right block "67890". To maximize its aggressiveness, the
LS 6000i can decode a UPC/EAN symbol by "splicing"
together a left block read by one scan line, and a right
block read by another.
Reject Predecode Block
This option provides additional protection (beyond the
embedded check digit) against mis-splicing a UPC/EAN
block from a symbol that has just been decoded (but has
not completely exited the scanner's field of view), with a
block from a new symbol that has just been presented to
the scanner. This option requires the scanner to
compare the new symbol against the symbol just
decoded to see if there are common blocks. If either the
left or right blocks match between symbols, the scanner
rejects the common block for the programmed Decode
Time-Off interval.
REJECT PREDECODE BLOCK
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