MSI Plessey Symbology Introduction
MSI Plessey Overview

MSI Plessey barcode is a linear barcode developed by MSI Data Corporation. It is invented based on the original Plessey code, used in libraries, and is often used for retail grocery shelf marking.

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MSI Plessey Data Encoding Instruction

MSI Plessey Character Set

Character Set Types: Alphanumeric

Character Set Breakdown:
  • 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

MSI Plessey Structure Introduction

Data Length Types: Variable-length

(Data Length in digits)

Codabar Structure Introduction

MSI Plessey barcode is a barcode symbology based on Pulse-Width Modulation. Each element in MSI Plessey is represent by 4 bars, using binary 0 and binary 1 to represent narrow bar and wide bar respectively.

Each MSI Plessey barcode is constructed of those following parts: quiet zone, start and stop character, eessage encoded, check digit. The start character is a single wide bar, and the stop character is two narrow bars.



Check Digit

MSI Plessey may have one or two check digit.

Modulo 10

A MSI Plessey barcode always includes a Modulo 10 checksum, which uses the Luhn Algorithm.



Modulo 1010

A MSI Plessey uses two Modulo 10 check digits: calculate the Mod 10 check digit the first time and then calculate it again with the previous result and append the result of the second Mod 10 Calculation to the string to be encoded.



Modulo 11

A MSI Plessey uses another method used to calculate a check digit is a Modulo 11 approach.



Modulo 1110

A MSI Plessey uses two Modulo 10 check digits: calculate the Mod 11 check digit the first time and then calculate it again with the previous result and append the result of the second Mod 10 Calculation to the string to be encoded.