Pitney Bowes J640 - Manual (Page 75)

Chapter 3. Using Check Digits
Check digits are typically used to ensure that a text or bar
code field scans correctly. If you apply Option 31, the printer
calculates a check digit.
You can use check digits with text or bar code fields. Check
digit calculations are performed on numeric data only.
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Do Not use check digits with price fields.
You can define a check digit scheme for some bar codes. The
following bar codes contain predefined check digits. Do not
define a check digit scheme for these bar codes:
✦ UPC
✦ EAN
✦ Code 39 (with the MOD43 check digit)
✦ Code 93
✦ PDF417
✦ POSTNET
✦ Maxicode
Defining a Check Digit Scheme––––––––––––––––––––––––––––––––
A check digit scheme determines how the printer calculates a
check digit. When you define a check digit scheme, you
assign a number to identify it. This number is later entered in
box R4 when you apply Option 31 to a field.
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