History of barcode–

26 Sep
Barcode Introduction —Code 39 Barcode Symbology
Code 39 is is the first alphanumeric barcode symbology in the world. It is aka Alpha39, Code 3 of 9, Code 3/9, Type 39, USS Code 39, or USD-3. It is a discrete, self-checking linear barcode symbology developed in 1974.  Code 39 is helps users to encode data in variable length and is widely used non-retail industries. It is also utilized by United States Department of Defense and Health Industry Bar Code Council (HIBCC).
Code 39 Valid Character Set
  •  A to Z and 0 to 9
  • Special characters: space $ % + – . /
  • Start/stop character:* (asterisk)
Code 39 Structure
Code 39 is defined in ISO/IEC 16388 and is composed of A leading quiet zone, a start character, one or more symbol characters representing data, one optional checksum digit, a stop character and a trailing quiet zone.
Extended Code 39
Extended Code 39 was designed for easy encoding of lower-case characters plus the characters of which Code 39 is capable to encode.
Modulo 43 checksum digit
The checksum of Code 39 is not required, however for applications needs to enhance data security, the 43 checksum digits could be appended. It is easy to calculate checksum of Code 39:
  1. Assinged numeric value of each data character then sum them up.
  2. Divide the result by 43.
  3. The remainder of the division is the check digit.

It is easy to encode Code 39 and Code 39 extended in web applicaitions, winforms, word, excel, crystal reports, local client side reports, SQL reporting services ect. Details please refer to http://www.aspper.com for barcode.


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