Pitney Bowes J640 - Manual (Page 77)

7. Determine what numbers to use as the weight string. A
weight string is a group of two or more numbers that is
applied to a field. For an example of how the weight string
is applied to a field, refer to "Sum of Products Calculation"
or "Sum of Digits Calculation" later in this chapter. In box
A8, enter the weight string enclosed in quotation marks,
like this:
"1234"
Sum of Products Calculation –––––––––––––––––––––––––––––––––
This is an example of how the printer uses Sum of Products 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 product of each digit is added together. This is
the sum of the products.
20 + 2 + 6 + 6 + 16 + 5 + 4 + 3 + 36 = 98
Usin
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Ch
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Chapter 3. Using Check Digits
3-3