Chapter 3 Data Capture; Introduction; Scanning Considerations - Motorola SB1 User Manual

CHAPTER 3 DATA CAPTURE

Introduction

The SB1 contains a bar code reader with combined aimer and illumination for reading bar code data. The
reader uses advanced camera technology to take a digital picture of a bar code, and executes state-of-the-art
software decoding algorithms to extract the data from the image.

Scanning Considerations

Scanning consists of; aim, scan and decode. Scanning performance can be optimized by considering the
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 SB1 closer and further away to find the right working range for the bar codes being
scanned. The best way to specify the appropriate working range per bar code density is through a chart called
a decode zone. A decode graph simply plots working range as a function of minimum element widths of bar
code symbols. See the SB1 Integrator Guide for the detailed information.
2.50 in.
6.36 cm
2.67 in.
5.70 cm
2.02 in.
5.13 cm
2.54 in.*
6.45 cm *
1.64 in.*
4.17 cm *
2.76 in.*
7.01 cm*
* Dependent upon bar code width
Bar Code Reader Decode Graph
Figure 3-1
13 mil 80% UPC
13 mil 100% UPC
7.5 mil Code 39
20 mil Code 39
10 mil PDF 417
7.98 in.
20.27 cm
10 mil Data Matrix
5.41 in.
13.74 cm
9.36 in.
23.77 cm
13.47 in.
24.80 cm
8.57 in.
21.77 cm
20.67 in.
52.50 cm