Scanning 2 - 7
The scanner can b e tilted up to 6 5° forward or back and achieve a successful deco de (Figure 2- 8). Simple practice
quickly shows what tolerances to work within.
Figure 2-8
Maximum Tilt Angles and Dead Zone
Scanning PDF Symbols
For optimal scanning performance, use rastering mode to scan PDF417 symbols. Adjust the raster to cover the
entire PDF symbol. For large PDF symbols, you ma y need to manually raster the scanner in order to cover the
entire symbol.
If the pattern does not co ver the top and bottom of a PDF symbol, pull the scanner back until it does. Make sure the
scan pattern extends beyond the edges of the bar code.
Figure 2-9
Raster Pattern Expanded Over PDF417 Symbol
If the vertical scan pattern is not high enough to cover a “tall” PDF417 symbol, move the scanner slowly down
toward the bottom of the symbol, keeping the beam horizont al to the ro ws, and then slowly back upward to the top.
Alternatively, move the scanne r fur ther away from the bar code until the scan pattern covers a larger portion of the
bar code in the vertical direction.
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