Scanning Considerations; Imaging - Motorola MC92N0-G User Manual

4 - 2 MC92N0-G User Guide
Launch a scanning application or a sample scanning application (DataWedge or ScanSample).
1.
Point the exit window on the top of the MC92N0-G at a bar code.
2.
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 4-1
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 Zebra Support if chronic scanning difficulties develop. Decoding of properly printed bar codes
should be quick and effortless.

Imaging

The MC92N0-G with an integrated imager has the following features: