Question
How do I calculate the checksum of SEMI OCR?
Answer
- Let's take a string of 12 characters, where the string is arranged as a A1,A2,A3,A4...A12.
- 1)First, subtract 20H from the ASCII code HEX for each string, and then decimal.
- If it is "0", it is 30H, so it is 30H-20H=10H, and it is 16 in decimal.
- 2)When N is the number of characters, the value of each character obtained in 1) is calculated by the following equation.
(A1x (N-1 power of 8)) + (A2x (N-2 power of 8)) + (A3x (N-3))+...(A12x of 8 (N-12 power of 8)) - 3)The result obtained in 2) is divided by 59, and the result passes if the remainder is 0. If there is a remainder, the checksum is rejected.
