Symbol Series 3100 Product Reference Manual page 74

Series 3100/3500 Product Reference Guide
• The PDF417 bar code symbol has multiple rows, but the raster pattern also has
multiple scanning rows. For this reason, do three basic things as you scan (refer
to Figure 4-10):
1. Center the aiming pattern on the bar code, as illustrated before.
2. Keep the pattern in the same horizontal plane as the bar code.
3/4"
Figure 4-10. Orienting Scanning Pattern On PDF417 Bar Code
3. If the vertical scan pattern is not high enough to cover a "tall" PDF417
symbol, it may be necessary to 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 (refer to Figure 4-11).
Figure 4-11. Moving Scan Pattern Upward and Downward on "Tall" PDF Symbol
• The scan beam does not have to be perfectly parallel with the top and bottom of
the symbol (up to a 4
4-28
o
tilt will work).
3/4"