2026-10-10How to interpret a Modbus‑RTU message?
Take 01 06 00 01 00 17 98 04 as an example:
  • 01: Slave address

  • 06: Function code

  • 00 01: Data address

  • 00 17: Data value

  • 98 04: CRC checksum

Meaning: Write value 0x0017 (decimal 23) to register address 0x0001 of slave No. 1.


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