Worth Data 802 RF user manual Interleaved 2 of 5 Code Specifications, Even Odd, + 1 =

Appendix G

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-
123456	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:

G-1