Opticon LG2 Series, Manual

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LG2 User’s Manual 25-ULG2MU01-02 - 48
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LG2 User’s Manual 25-ULG2MU01-02 - 49
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7.5 - Barcode Readability Index
The Readability Index provides a measurement of a specific symbol’s ease or difficulty to be decoded
by the LG2. The Readability Index is specific to the LG2, and should not be confused with a verification
quality measurement.
The Readability Index is a blend of information obtained from the internal operations of the decoding
algorithm pertaining to contrast, symbology construct, error detection, forward error correction (if
applicable), and other symbology-specific characteristics.
The Readability Index is a score on a scale of 01 (very poor) to 100 (very readable). Due to differences
based on motion, skew, reflection, focus, and ambient lighting, the Readability Index on the same symbol
may vary somewhat from read to read. However, a poor contrast or damaged symbol will score lower
than a high contrast undamaged symbol. The Readability Index can be used as a quick check on the
reliability of label generation or marking systems. When used in conjunction with the LG2 stand (or fixed
mount positioning) which fixes the distance from the reader to the symbol, and constant ambient light, the
Readability Index provides a symbol quality assurance tool and check point for feedback to an overall label
or marking quality control system.
The Readability Index is enabled by first reading a CodeXML rule into the permanent LG2 Memory:
Code Readability Index Rule:
The Reader will store the rule and reset, but will not output the Readability Index until the Readability Index
Output Enable code is read. To remove this rule, scan the Clear All CodeXML Rules code in section 11.1.
Readability Index Output Enable:
Scan the following codes to set the delay time for reading duplicate codes:
0 Seconds (Default) 1 Second 3 Seconds
7.4.3 - Continous Scan - Duplicate Scan Delay