Worth Data RF Laser Interleaved 2 of 5 Code, Interleaved 2 of 5 Mod 10 check digit calculation

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:

123456

•Use one length of I 2 of 5 code. Using one length of data allows you to tell the RF Laser Reader to look for one length of I 2 of 5 code only. By default, the RF Laser Reader 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 Laser Reader Setup Menu. Setting the length to 00 digits allows variable length bar codes scanning but also dramatically increases your chance of a mis-read.

•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

5.Add the results of steps 3 and 4:

9 + 48 = 57

39