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Example:
Code 128 is one of the more complex linear barcodes, with a greater capacity than Code 25 or Code 39, but requiring better quality images for reliable recognition.
Key features:
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A Code 128 barcode is written as follows:
Start character (start A, start B or start C) (3 bars)
1 or more data characters (3 bars each) Checksum character – calculated from the data characters (3 bars) Stop character (4 bars)
Specification:
Note:
The CODE A, B and C symbols latch all following characters to the specified symbol set where as SHIFT A and SHIFT B just change the interpretation of the next character.
Checksum Calculation:
The checksum is calculated as follows:
For example, if you are encoding the string ABCD1234 in symbol set A then the checksum values will be:
Steps 1 and 2:
(33 * 1) + (34 * 2) + (35 * 3) + (36 * 4) + (17 * 5) + (18 * 6) + (19 * 7) + (20 * 8) = 836
Step 3:
836 + 103 = 939
Step 4:
939 mod 103 = 12
So the checksum character should have value 12.
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