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Sum of Digits Calculation
This is an example of how the printer uses Sum of Digits to
calculate a check digit for this data:
5 2 3 2 4 5 2 1 9
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:
5 2 3 2 4 5 2 1 9
weight string:
4 1 2 3 4 1 2 3 4
2.
Each digit in the field is multiplied by the weight assigned to it:
field:
5 2 3 2 4 5 2 1 9
weight string:
4 1 2 3 4 1 2 3 4
products:
20 2 6 6 16 5 4 3 36
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
4-12
Defining Field Options