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I'm having a difficult time grasping the proper way to calculate the LRC for ASCII Modbus protocol. I turned to the web for examples, however, they seem to conflict with the explanation given in the Modbus protocol reference guide. Can you tell me, for example, if my ASCII message frame was, :3A 09 03 03 1F 00 28 LRC CR LF, how exactly is the LRC calculated? The parity is even (I'm still not sure whether that matters or not). Please be specific, remember, I couldn't understand the original explanation. Thank you very much for your help!