A check character is required to be printed with certain ISBT 128 data structures (such as the DIN). This program calculates the check character based on the ISO 7064 Mod 37-2 algorithm. Click on the button below to download the program.

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For information on the keyboard entry check character, refer to section 7.5 of the ISBT 128 Standard Technical Specification (ST-001). The list of ISBT 128 data structures that require a check character are listed in Reference Table RT002 of that section.