This parameter reverses the order of the check digit multiplier before adding the product to use in the Check Digit Modulus.
Each character in the scanned data is assigned a numeric value (see OCR Check Digit Multiplier). The check digit multiplier is reversed in order. Each value representing a character in the scanned data is multiplied by its corresponding digit in the reversed multiplier, resulting in a product for each character in the scanned data. The sum of these products
except for the check digit's product
is computed. The check digit passes if this sum modulo Check Digit Modulus is equal to the check digit's product.
For example:
Scanned data numeric value is
122456
(check digit is 6)
Check digit multiplier string is
123456
Digit
1
2
2
4
5
6
Multiplier
6
5
4
3
2
1
Product
6
10
8
12
10
6
Product add
6+
10+
8+
12+
10=
46
6
The Check Digit Modulus is 10. It passes because 46 divided by 10 leaves a remainder of 6.
