GS1-128 barcodes always contain a special non-data character known as the Function 1 (FNC1) character, which follows the start character of the barcode. It enables scanners and processing software to recognize GS1 symbols and process relevant data.
The GS1-128 barcode is made up as follows:
- a leading Quiet Zone
- a start character A, B or C
- a Function 1 character (FNC1)
- the data (Application Identifier + data field)
- a symbol check character
- a stop character
- a trailing Quiet Zone
Note: GS1-128 symbols shall not be used for symbols that require more than 48 data characters.
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