Appendix C: Bar codes
C-11
If the amount of print data for Code Interleaved 2/5 is an odd number,
a 0 is added. This 0 is the first bar code character.
Calculating the checksum for
EAN13
a: add all even-numbered data positions
(start on the left-hand side)
b: a*3
c: add all odd-numbered data positions
(starting on the left-hand side)
d: b+c
e: d mod 10
f: 10-e
f is the checksum.
Example: bar code data 123456789012@
a: 2+4+6+8+0+2 = 22
b: 22*3 = 66
c: 1+3+5+7+9+1 = 26
d: 66+26 = 92
e: 92 mod 10 = 2 (92 / 10 = 9 Remainder 2)
f: 10-2 = 8
checksum is 8
No calculation takes place for UPC-E, it does not print the check-
sum.
Calculating the Checksum for
Code 39
All values of the bar code data are added. The total is divided by 43,
and the remainder is the checksum.
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