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• Bar code (barcode) is the number of black bars of varying widths and gaps, arranged
according to some encoding rules, used to express a set of graphic identifier
information. Common bar code is a big difference from the reflectivity of the black
section (the article) and the white bars (the air) arranged in a parallel line pattern.
• bar code scanners use of its own light source, re-use fiber media converter receiving
the reflected light, reflected light of light and shade will be converted into digital
signals. No matter what the rules of the bar code printing, by quiet zone, start
character, data characters and end characters. Some bar code data characters and
check characters are between the termination character.
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