Scanning Considerations; Imaging - Motorola MC9190-G User Manual

3 - 2 MC9190-G User Guide
Press the trigger or scan button. Ensure the red scan beam covers the entire bar code. The Scan LED
3.
Indicators illuminate red to indicate that the laser is on. The Scan LED Indicators illuminate green and a beep
sounds to indicate a successful decode.
Laser Aiming
Figure 3-1
Release the trigger or scan button.
4.

Scanning Considerations

Scanning consists of; aim, scan and decode. Scanning performance can be optimized by considering the range
and the scanning angle:
•
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
The scan angle is important for optimizing decode performance. 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 do not 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 Motorola Enterprise Mobility Support Center if chronic scanning difficulties develop. Decoding of
properly printed bar codes should be quick and effortless.

Imaging

The MC9190-G with an integrated imager has the following features:
•
Omnidirectional (360°) reading of a variety of bar code symbologies, including the most popular linear,
postal, PDF417, and 2D matrix code types.
•
The ability to capture and download images to a host for a variety of imaging applications.