Interleaved 2 Of 5 Code Specifications - Worth Data 7100 RF Terminal Series Owner's Manual

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 applica-
tions. A combination of five elements, two wide and three narrow represent each character. Odd-number position digits are en-
coded 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

Assume that the bar code data is 1987.

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

Take the sum of the odd digits:
8 + 1 = 9

Multiply the sum of the even digits by 3:
(7 + 9) x 3 = 48

Add the results of steps 3 and 4:

Subtract the result of step 5 from the next highest multiple of 10:

The checksum becomes the low-order digit:

Because the data now has an odd length, a leading zero is added, for the final result of
019873
9 + 48 = 57
60 - 57 = 3
19873
84