NCR 7800, User Manual, Page: 39 / 112

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NCR 7800 Operation
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Because the NCR 7800 produces a dense, omnidirectional
scan pattern, labels can be read from many different angles.
In order for the scanner to read a label, the center 90% of one
scan line must cross the bar code. Therefore, labels are more
easily read if the merchandise is positioned so that the label is
presented toward the center of the scan pattern.
To successfully read Interleaved 2 of 5 and Code 39 labels,
the scan line must cross the entire label, not missing any of
the bars or spaces. UPC and Code 128 labels can be read by
piecing together separate reads of slightly more than half of
each side of the bar code. Therefore, these labels are much
easier to read.
Scan Pattern
Location