OCR Programming
331
Product Add Left to Right
Each character in the scanned data is assigned a numeric value (see OCR Check Digit Multiplier on page 329).
Each digit representing a character in the scanned data is multiplied by its corresponding digit in the multiplier, and
the sum of these products is computed. The check digit passes if this sum modulo Check Digit Modulus is zero.
Example:
Scanned data numeric value is 132456 (check digit is 6)
Check digit multiplier string is 123456
Digit 1 3 2 4 5 6
Multiplier 1 2 3 4 5 6
Product 1 6 6 16 25 36
Product add 1+ 6+ 6+ 16+ 25+ 36= 90
The Check Digit Modulus is 10. It passes because 90 is divisible by 10 (the remainder is zero).
Product Add Right to Left
Each character in the scanned data is assigned a numeric value (see OCR Check Digit Multiplier on page 329).
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 is computed. The check digit passes if this sum modulo Check Digit
Modulus is zero.
Example:
Scanned data numeric value is 132459 (check digit is 9)
Check digit multiplier string is 123456
Digit 1 3 2 4 5 9
Multiplier 6 5 4 3 2 1
Product 6 15 8 12 10 9
Product add 6+ 15+ 8+ 12+ 10+ 9= 60
Product Add Left to Right
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