Lexmark X864 Forms and Bar Code Technical Reference - Page 60
Product Code, Check Digit, UPC-E including +2 and +5 variants
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c Product Code: The product code is a unique code assigned by the manufacturer. Unlike the manufacturer code, which must be assigned by the UCC, the manufacturer is free to assign product codes to each of their products without consulting any other organization. d Check Digit: The check digit is an additional digit used to verify that a bar code has been scanned correctly. Since a scan can produce incorrect data due to inconsistent scanning speed, print imperfections, or a host of other problems, it is useful to verify that the rest of the data in the bar code has been correctly interpreted. The check digit is calculated based on the rest of the digits of the bar code. Normally, if the check digit is the same as the value of the check digit based on the data that has been scanned, there is a high level of confidence that the bar code was scanned correctly. 2 UPC-E (including +2 and +5 variants) UPC-E is a variation of UPC-A which allows for a more compact barcode by eliminating "extra" zeros. Since the resulting UPC-E barcode is about half the size as an UPC-A barcode, UPC-E is generally used on products with very small packaging where a full UPC-A barcode couldn't reasonably fit. A UPC-E code is contains: • Left-hand guard bars, or start sentinel, encoded as 101. • Six data characters, encoded from the parity table above. Composite bar codes 57