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Case 369

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  • Case 369

    Question:
    The RMS-HCD Modbus RTU communication is not clear. It explains the ordering of the bytes for the Checksum (LSB, MSB in the CRC).

    Possible Root Cause:
    1. No example of the order of the bytes for the Checksum.
    Solution:
    Hex format: 01 04 00 00 00 04 f1 c9
    1. 01 device address
    2. 04 command id
    3. 00 not used
    4. 00 start address, init16
    5. 00 not used
    6. 04 number of data = 4, init 16
    7. f1 > CRC 16bit Modbus (LSB)
    8. c9 > CRC 16 bit Modbus (MSB)
    Additional Information:
    The PCD includes this example with the LSB, MSB in the CRC. It explains the ordering of the bytes for the Checksum.
    https://service.rotronic.com/manual/modbus2.html.
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