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:
Hex format: 01 04 00 00 00 04 f1 c9
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.
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:
- No example of the order of the bytes for the Checksum.
Hex format: 01 04 00 00 00 04 f1 c9
- 01 device address
- 04 command id
- 00 not used
- 00 start address, init16
- 00 not used
- 04 number of data = 4, init 16
- f1 > CRC 16bit Modbus (LSB)
- c9 > CRC 16 bit Modbus (MSB)
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.