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4. Using Check Digits
Check digits are typically used to verify that a field is scanned
correctly. You can use check digits on text or bar code fields.
Do not use check digits on price fields or incrementing fields.
Perform check digit calculations only on numeric data only.
You can choose whether the check digit is
•
generated
by the printer or
• entered by the operator and
verified
by the printer.
You can apply field Option 31 to generate or verify 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 predefined check digits. Do not
define check digits for these bar codes.
Using Check Digits
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