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Gs1-128 Barcode


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    Ian Cummings
    Code set C encodes data in numeric pairs, therefore there needs to be an even number of digits in the barcode. This includes all function, AI, data and check digit characters. If an odd number of digits is given as input BarTender will be forced to pad with a zero if code set C is explicitly specified. It is impossible to encode and odd number of digits into Code 128 code set C using any software. If you use the "Auto" feature for the code set, you will find that the majority of the symbology is encoded using code set C with a switch somewhere near the end of the data to code set A or B to encode the remaining odd number of digits.

    Wikipedia has a good write-up of this that explains it in greater detail:

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