Discussion
A Modbus master addresses a slave by
Answer: A
Correct answer: a unit identifier in the first byte of the frame
Every Modbus frame begins with the unit identifier, and only the slave holding that address responds. The addressing is therefore entirely logical: physical position on the bus is irrelevant, and each slave’s address is configured in the device. Modbus TCP retains the same field even though the IP address has already selected the machine, which is how it addresses devices behind a gateway.
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