Data Capture; Laser Scanning; Scanning Considerations; Scanning Bar Codes - Motorola WT4090 User Manual

Data Capture

Wearable terminals used with an optional wearable laser scanner allow collection of data by scanning one
dimensional bar codes.

Laser Scanning

Wearable terminals with an optional wearable laser scanner have the following features:
•
Reading of a variety of bar code symbologies, including the most popular linear, postal, and 1-D code types.
•
Advanced intuitive laser aiming for easy point-and-shoot operation.

Scanning Considerations

Typically, scanning is a simple matter of aim, scan/decode and a few quick trial efforts master it. However, two
important considerations can be used to optimize any scanning performance:
•
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 scanning device optics.
Scanning within range brings quick and constant decodes; scanning too close or too far away prevents
decodes. Move the scanner closer and further away to find the right working range for the bar codes being
scanned. However, the situation is complicated by the availability of various integrated scanning modules. The
best way to specify the appropriate working range per bar code density is through a chart called a decode zone
for each scan module. A decode zone simply plots working range as a function of minimum element widths of
bar code symbols.
•
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 "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 sharp an
angle; the scanner needs to collect scattered reflections from the scan to make a successful decode. Practice
quickly shows what tolerances to work within.
NOTE Contact the Symbol Support Center if chronic scanning difficulties develop. Decoding of properly printed bar
codes should be quick and effortless.

Scanning Bar Codes

Ensure that a scan enabled application is loaded on the wearable terminal.
1.
Aim the scan exit window at the bar code.
2.
Press the trigger.
3.
•
Ensure the red scan beam covers the entire bar code. The red scan LED lights to indicate that the laser is
on. The green scan LED lights. An audible beep might sound, if the application determines, to indicate the
bar code was decoded successfully.
Using the Wearable Terminal 2 - 15