Symbol WSS 1000, Product Reference Manual

Page: 81 / 133

6-12
WSS 1000 Product Reference Guide
Note: Scanner use depends on the application. The procedure for your
scanner may differ.
Scanning Considerations
Usually, scanning is a simple matter of aim, scan, and decode, and a few trial efforts master
it. However, two important considerations can optimize any scanning technique — angle and
range.
Angle
Scanning angle is important for promoting quick decodes. When laser beams reflect directly
back into the scanner from the bar code, this specular reflection can actually “blind” the
scanner.
To avoid this, scan the bar code so that the beam does not bounce directly back. But don’t
scan at too oblique an angle; the scanner needs to collect scattered reflections from the scan
to make a successful decode. Practice shows what tolerances to work within.
Range
Any scanning device decodes well over a particular working range (minimum and maximum
distances from the bar code). This range varies according to bar code density and scanner
optics.
Scanning within range results in quick, constant decodes; scanning too close or too far away
prevents decodes. You need to find the right working range for the bar codes you are
scanning. The best way to specify appropriate working range by bar code density is through
a decode zone chart. The decode zone plots the scanner’s working range as a function of
Table 6-2. LED Indications
(Subject to Application Use)
Message Green LED Red LED
Successful Decode On Off
Scanning Off On
Scanner in Blink Mode Off Blinking
Unit Off Off Off