Worth Data P11/12 - Manual (Page 48)

G-1
Appendix G
Interleaved 2 of 5 Code
Interleaved 2 of 5 Code is a numeric-only, even-number-of-
digits bar code. It is widely used in warehouse and industrial
applications. A combination of five elements, two wide and
three narrow represent each character. Odd-number
position digits are encoded in the bars, even-number
positions in the spaces.
Interleaved 2 of 5 Code is so susceptible to partial scans being interpreted as valid
reads that we recommend at least one of the following safeguards:
Use one length of I 2 of 5 code. Using one length of data allows you to tell the
TriCoder to look for one length of I 2 of 5 code only. By default, the TriCoder
is set to look for a 6 digit I 2 of 5 code but you can set the length to something
different using the TriCoder Setup Menu. Setting the length to 00 digits
allows variable length bar codes scanning. If you must use the 00 setting, we
recommend that you then use the "Minimum/Maximum" data length field
when creating a program in the TriCoder to check each field for the proper
length.
Use a check digit. Worth Data's LabelRIGHT printing program automatically
calculates and prints a check digit upon request using the method below:
Interleaved 2 of 5 Mod 10 check digit calculation
1. Assume that the bar code data is 1987.
2. Starting with the least significant digit (in this case, a 7), label the digits
alternatively even and odd.
7 - even
8 - odd
9 - even
1 - odd
3. Take the sum of the odd digits:
8 + 1 = 9
4. Multiply the sum of the even digits by 3:
(7 + 9) x 3 = 48
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