Datalogic QuickScan QS2500 Guide De Référence Rapide page 6

How to Scan
The figure below shows the right and wrong ways to scan.
1. The scanner must be pointed at a slight angle to the bar code
so that the light reflect off the bar code can be "seen" by the
scanner. Do not hold the scanner perpendicular to the bar
code.
2. The scan beam must cross the entire label. The scanner can-
not read the bar code data without seeing the entire label.
Scanning PDF417 Bar Codes
To read a PDF417 bar code,
aim the scan line at the top of
the bar code, and in a smooth
motion, pull the scan line
through the bar code. You
will hear a series of ticks, fol-
lowed by a final beep when
the bar code's content has
been completely decoded. You may need to sweep the bar code
several times in order to complete the read.
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QS2500