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5. Subtract the remainder from the modulus.
The result becomes the check digit. In this case, the check digit is 2.
10-8=2
Sum of Digits Calculation
This is an example of how the printer uses Sum of Digits to calculate a
check digit for this data:
523245219
1. Weights are applied to each digit, starting with the last digit in the
weight string. They are applied right to left, beginning at the right-most
position of the field. Remember, a weight string must contain at least
two different numbers. This example has a weight string of 1,2,3,4:
field: 523245219
weight string: 412341234
2. Each digit in the field is multiplied by the weight assigned to it:
field: 523245219
weight string: 412341234
products: 202661654336
3. Next, the digits of the products are added together. Two-digit products
are treated as two separate digits.
This is the sum of the digits.
2+0+2+6+6+1+6+5+4+3+3+6=44
4. Divide the sum of the digits by the modulus (10 in this case), only to the
whole number. The balance is called the remainder.
4
10 44
40
4
Defining Field Options 3-15