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Monday, November 25, 2013

Code 49 : Code39

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.
barcode-beispiel
Fig. 1: "Beispiel" encoded by Code39.

Principle

3of9-allinone
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

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