Worth Data RF Terminal 7000 - Manual (Page 94)

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
• 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:
9 + 48 = 57
• Subtract the result of step 5 from the next highest multiple of 10:
60 - 57 = 3
• The checksum becomes the low-order digit:
19873
• Because the data now has an odd length, a leading zero is added, for the final result of
019873