K-1
Appendix K
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
1. Form a number from the odd positions, starting in the units
position.
835
2. Multiply the new number by 2
(835) x 2 = 1670
3. Add the digits of product
1 + 6 + 7 + 0 = 14
4. Add the even digits of the original number to the result in 3
2 + 4 + 14 = 20
5. Subtract the result from the next highest multiple of 10
20 - 20 = 0
6. New Check Digit
0
7. Data with check digit is:
823450
