Symbol PDT 7200 Series Product Reference Manual page 68

Scan the Entire Bar Code Symbol
The larger the symbol, the farther away you should hold the scanner to permit the
!
raster pattern to cover the symbol (but not more than 8 inches). See
Specifications
Hold the scanner close for denser symbols (not less than 2 inches).
!
In all cases, make sure the scan pattern extends at least 3/4 inch beyond each edge of
!
the bar code
The PDF417 bar code symbol has multiple rows, but the raster pattern also has
!
multiple scanning rows. For this reason, as you scan:
" Center the aiming pattern on the bar code, as illustrated in
" Keep the pattern in the same horizontal plane as the bar code.
3/4"
Figure 5-4. Orienting Scanning Pattern On PDF417 Bar Code
" 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 horizontal to the rows, and then slowly back upward toward the top
(Figure
for more details on the 1-D/PDF417 Scan Element Decode Zones.
(Figure 5-4).
5-5).
Operating the Terminal
Appendix A,
Figure 5-3.
3/4"
5-11