I-1
Appendix I
Interleaved 2 of 5 Code
Specifications
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 RF Terminal to look for one length of I 2
of 5 code only. By default, the RF Terminal is set to look for
a 6 digit I 2 of 5 code but you can set the length to something
different using the RF Terminal 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 RF Terminal 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:
123456
