Worth Data 701 RF Owner's Manual download pdf (Page 85)

MSI/Plessey Specifications

Plessey is a variable length numeric only bar code. MSI Bar Code is a variable length, numeric-only code with an automatically

appended Modulus 10 check digit. MSI is sometimes called Modified Plessey Code. If the user specifies an additional check digit,

the MSI code can be 14 digits long, otherwise it has a maximum length of 13 characters. This is how the MSI check digit(s) are

calculated:

The MSI Mod 10 check digit is calculated as follows:

The example bar code data is: 82345

 Form a number from the odd positions, starting in the units position

835

 Multiply the new number by 2

(835) x 2 = 1670

 Add the digits of product

1 + 6 + 7 + 0 = 14

 Add the even digits of the original number to the result in 3

2 + 4 + 14 = 20

 Subtract the result from the next highest multiple of 10

20 - 20 = 0

 New Check Digit: 0

 Data with check digit is: 823450

The MSI Mod 11 check digit is calculated as follows:

The example bar code data is:

943457842

 Assign a checking factor to each number, starting with the units position of the number (in this example, the 2) up to the highest

order position (the 9). Use checking factors of:

2,3,4,5,6,7,2,3,4,5,6,7...

 Multiply the checking factor with its assigned number and add the products:

4 + 12 + 32 + 35 + 30 + 28 + 6 + 12 + 36 = 195

 Divide the sum by 11

195/11 = 17 remainder 8

 Subtract remainder from 11

11 - 8 = 3

 New Check Digit

(If the remainder is 10, no check digit is added.)

 Data with check digit is:

943457823

1 2 ... 80 81 82 83 84 85 86 87

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Worth Data 701 RF Owner's Manual Page 85