MSI Barcode (Modified Plessey Barcode)

MSI (Modified Plessy) barcode was developed by the MSI Data Corporation, based on the original Plessey Code. It is used primarily to mark retail shelves for inventory control and is a continuous, non-self-checking symbology.

An MSI barcode has the following structure:

  • A start character which is a wide bar followed by a narrow space.
  • Any number of characters.
  • Checksum digit.
  • A stop character, which is a narrow bar, a wide space, then a narrow bar.

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