Calculation of Code39 Modulo 43 Check Character

For example if the data "1234" is to be encoded as a barcode. The check character is calculated as follows.

ASCII Characters	1	2	3	4
Code 39 Values	1	2	3	4
Sum :	1 + 2 + 3 + 4 = 10
Modulo 43 :	10 % 43 = 10 (which maps to the character 'A')

The characters "*1234A*" can then be keyed in to the text editor with the appropriate font selected to generate a Code 39 barcode with check characters.

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