Rockwell Automation 2755 StrataScan Bar Code Readers - Manual (Page 25)

3–4 Designing Your System
Publication 2755-6.13
Tilt
A symbol is tilted when the symbol’s bars are not 90
°
to one of the
scan lines. The symbol can be read with any tilt, provided a scan
line passes through all bars and quiet zones on each sweep for the
required minimum number of scans. Tilt may reduce the number of
scans in a given application.
Pitch
A symbol is pitched when the symbol’s bars are at different distances
from the reader. From the reader’s perspective, a pitched symbol
appears to have a smaller narrow element width than it actually has.
This may reduce both the read rate and the read range. However, the
symbol can still be read if the apparent narrow element width is
within the reader’s specifications.
Skew
A symbol is skewed when the ends of the symbol’s bars are not at
the same distance from the reader. The symbol can be read if the
distance of both ends of the bar are within the reader’s read range,
and the skew is less than
$40 degrees from the centerline. Unlike
pitch, skew does not affect the read range.