8-5
Chapter 8. Modbus Communication Function
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Modbus/RTU
All messages use binary data (each slot below represents one byte).
A Modbus RTU message consists of (1) to (3) below.
The command (details sent from the master station) and the response (details
returned from the slave station) are stored in (2).
(1) (2) (3)
1 frame
(1) Station address (1 byte)
(2) Instruction message, response message
(3) Checksum (2 bytes)
• Station address
This device creates a response message only to instruction messages that mention
its station address. A station address is expressed in one byte in a message.
This device returns a response message that includes its own station address.
The station address can be specified by C65 (station address). Note that, if
the station address is set to 0, this device does not respond even if the station
addresses match.
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