Rockwell Automation 2755 2D Hand-Held Scanner - Manual (Page 45)

Operating the Scanner 3–7
Publication 2755-6.4
Dead Zone
When scanning a 1-D bar code, there is only a small specular dead
zone to avoid (+2
_ from the direct laser beam). The specular dead
zone is larger when scanning PDF417 (+9 _ from the direct laser
beam). At the same time, the scanner is not effective if its beam hits
the bar code’s surface at an angle greater than 30
_ from normal to
that surface.
1. Successful Scanning 2. Successful Scanning
Angles for Good Decodes
Bar Code
Right Angle
Normal
0 _ – 30_
20 _ – 50_
Tilted 0 _ – 30_ back from surface Tilted 20 _ – 50_ forward toward surface
Scan Beam
Scan Beam
You can also scan successfully by tilting the scanner forward from
parallel about 20
_ to 50_ toward the scanning surface.