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Defining a Check Digit Scheme
See "Sample Check Digit Calculation" later in this chapter if
you need help defining the Check Digit Scheme.
1. Make a copy of the Check Digit Record template on the
following page, or the check digit worksheet in Appendix D.
Use the copy for steps 2 through 7.
2. Assign a number from 1 to 9 to identify this calculation
scheme. Write the number in box A2 in the Check Digit
Record.
3. Decide whether to add or clear the check digit.
A - Add
C - Clear.
4. Decide how the printer will store the Check Digit Record.
R - Printer Memory
M - Memory Card.
Write R or M in Box A4.
5. Assign a number from 2 to 10 to use as a
modulus
in the
check digit calculation. Write the number in box A5.
6. Determine how many characters will be in the fields that
use this scheme,
not including the check digit
. Write the
number in box A6. The maximum number is 29.
7. Determine how the check digit be calculated. Write D for
"sum of digits," or P for "sum of products" in box A7.
8. Determine what numbers to use as
weights
for check digit
calculation. Do not include a weight for the check digit.
You need a string of numbers equal in length to the
number in box A6. Enter the string of numbers in box A8.
NOTE: Use zero as a weight digit in positions containing
non-numeric characters.
9401/9402 System Administrator’s Guide
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