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I am trying to communicate to a serial device that has a data string with a calculated CRC. I am able to parse all useable data but can not seem to calculate the CRC for verification. It is an CRC-CCITT reverse algorithm, 8 bit accumulator. It uses an odd polynomial and start seed. I have looked at a Modbus example of CRC but can't seem to see how to make it work. Has anyone seen any generic crc samples in RSlogix5000? Any help would be appreciated.