Code39
Background
The barcode Code39 was developed in 1973 by the company Intermec. The name Code39 is derived from the fact that one character is represented by three broad (from a total of 9) bars, each one is either black or white.
Fig. 1: "Beispiel" encoded by Code39.
Principle
Fig. 2: Code39-Tabelle
The beginning and the end of the encoded word are marked with an *.
An optional checksum can be added as well. This checksum is derived from the sum of used characters modulo 43. For the message "Beispiel" used in Fig.1 . the checksum would be:
B:12 + E:15 + I:19 + S:29 + P:26 + I:19 + E:15 + L:22 = 157 mod 43 = 28 = R
An optional checksum can be added as well. This checksum is derived from the sum of used characters modulo 43. For the message "Beispiel" used in Fig.1 . the checksum would be:
B:12 + E:15 + I:19 + S:29 + P:26 + I:19 + E:15 + L:22 = 157 mod 43 = 28 = R
Weblinks
References
1 http://en.wikipedia.org/wiki/File:3of9.jpg, 2009-03-02
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