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Codabar

The Codabar, which is sometimes called Code 2/7, has been used since 1972 mainly by libraries and medical users. In 1977 the Codabar became the standard code for blood banks. It has a variable length and a character-set built of the numerals 0 to 9 and the special characters -, $, :, /, . and +. Furthermore this code has to have explicit start and stop characters added to it. Valid start and stop characters are the letters A, B, C and D. Codabar users may in some circumstances define in their application standards special start/stop combinations to classify different information. For example, the American Blood Commission has made an agreement about the combinations of Codabar symbols which means that if a Codabar ends with the stop mark D, another Codabar with the start mark D will be expected in the following 19 mm. If this second symbol is recognized, both information items will be combined into one, with the two D characters suppressed.


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Last updated on June 24, 2015

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