Bar Code Failures; Process For 1-D Barcode Analysis - Printronix Auto ID T8204 User Manual

Bar Code Failures

The ODV-2D tells the printer to announce a fault condition in two situations:
• When the validator detects a bad bar code
• When the validator detects no bar code where it expects to find one.
How the printer reacts to these faults is determined by the printer's configuration settings, as described in
this section.

Process for 1-D Barcode Analysis

The following flow chart in Figure 5 is an overview of how the ODV-2D performs the 1-D barcode analysis.
Reflectance Minimum <=
Threshold percentage of
Reflectance Maximum
Symbol contrast >= Sym-
bol contrast Threshold
Grading Scale:
A: >= 70%
B: >= 55%
C: >= 40%
D: >= 20%
F: < 20%
Defects <= Defects
Threshold
Grading Scale:
A: <= 15%
B: <= 20%
C: <= 25%
D: <= 30%
F: < 30%
Percent Decode >= Per-
cent Decode Threshold
Figure 5 1-D Barcode Analysis
Edge Determination
Min. Edge Contrast (worst
pair) >= Min. Edge Contrast
Modulation >= Modulation
Decodeability >= De-
codeability Threshold
Overall Grade >= Overall
Grade Threshold
Threshold
Threshold
Grading Scale:
A: >= 70%
B: >= 60%
C: >= 50%
D: >= 40%
F: < 40%
Grading Scale:
A: >= 62%
B: >= 50%
C: >= 37%
D: >= 25%
F: < 25%
Grading Scale:
A: 3.5 to 4.0
B: 2.5 to 3.4
C: 1.5 to 2.4
D: 0.5 to 1.4
F: 0.0 to 0.4
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