Rockwell Automation 2755 AdaptaScan Software - Manual (Page 197)

Appendix
B
Preset Read Ranges
A, B, C, C+
This appendix shows the 4 preset read ranges (A, B, C, C+) for the
Catalog No. 2755-SN3, -SN5, -SN8 Readers. You can make manual
range adjustments after selecting a preset read range.
The four preset read ranges allow for easy replacement of an existing
scanner. These read ranges can read bar code labels at various
distances depending on the apparent minimum element width and
scanner to label pitch.
Read range data is based upon the following conditions:
•
95% reads minimum with reader set at maximum scan angle.
•
Test label is Code 39, size reference is narrow bar.
•
Label orientation on axis with 5
_ pitch, 25_ skew.
Read ranges are measured from the front edge of the wiring base.
Add .58 inches (1.5 cm) for the distance to the scan window.
Read Range
Measured From This Point
Read ranges on the following charts are for preset focus ranges A, B,
C, and C+ at ambient temperature. These read ranges are based upon
Code 39 labels at 25
_ skew, 5_ pitch. Typical preset read ranges will
exceed those shown. The center of the read range will shift up to
15% over the full operating temperature (0 to 50
_C) of the Reader.
Different symbologies, skew, and pitch will also result in slightly
different range. Greater read range may be achieved by manually
adjusting the focus. Greater read ranges may also be obtained by
reducing the scan angle to less than 100%. Try different settings to
determine the optimum label positioning, focus range units, and scan
angle for your application.
Overview
Read Ranges
Read Range
Data References