Avery Dennison 9406 System Administrator Guide - Manual (Page 69)

4. Using Check Digits
Typically, you use check digits to be sure a field is scanned
correctly. You can use check digits on text or bar code fields.
Do not use check digits on price fields. Perform check digit
calculations only on numeric data.
You apply field Option 31 to generate the check digit. Option
31 is explained in this chapter.
You can define your own check digit calculation scheme for
other bar codes and numeric text fields. Some sample
calculations are shown in this chapter.
UPC and EAN bar codes have pre-defined check digits. Do not
define check digits for these bar codes.
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