Free Barcode Font - Code 128 Code 128 is variable length format that can be read in either direction and incorporates a checksum for built in validation. Code 128 was designed to reduce the amount of space required by the Code 39 format which it does by about 30%, and to include the full ASCII character set, with both upper and lower case alphabetical characters, and punctuation. There are three different sets of characters that are represent by 106 different barcodes, these are shown in the at the bottom of this page. • Set A - Capital letters, numeric values, control codes, punctuation • Set B - Capital letters, numeric values, lowercase letters, punctuation • Set C - Double density numeric values from 00 through to 99 All set can be started, switch to another set and provide a stop mark. Checksum calculation The checksum for code 128 is mandatory and is calculated by adding the weighting value of the character position to the character number and then applying a a modulus of 103, this is probably best explained with a example: Lets encode the word “ BarCode” Character Value Weighted value Total Start Set B 104 104 104 B 34 34 * 1 34 a 65 65 * 2 130 r 82 82 * 3 246 C 35 35 * 4 140 o 79 79 * 5 395 d 68 68 * 6 408 e 69 69 * 7 483 Total 1940 This results in a modulus of 86, i.e.

Chip Tuning Software more. Code 128 is one of the most popular modern barcodes. It is a very high density barcode supporting alphanumeric characters. This barcode is used as the basis for many other barcodes like UCC/EAN, HIBC(Health Industry Barcode) and.

1940 / 103 = 18 remainder 86, so the checksum value is 86 represented by the 'v' character. So the fully encoded barcode becomes: 104(start set B)+ 34(B)+ 65(a)+ 82(r)+ 35(C)+ 79(o)+ 68(d)+ 69(e)+ 86(v)+ 106(stop) As you can see from the above example this can become quite complicated to calculate, especially when you need to start swapping between sets to produce the optimal barcode, fortunately the code to calculate this optimization including the checksum algorithm with the start hand stop characters built into the barcode has been done by myself and others.