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4.
Divide the sum of the products by the modulus (
10
in this
case), only to the whole number. The balance is called
the remainder.
9
10 98
90
8
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:
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
MPCLII Packet Reference Manual
5-16