Modbus Communication
‑19‑
The AC drive adopts the Modbus‑RTU slave communication protocol, which allows
the AC drive to provide data to respond to query commands from the master or
execute actions according to query/commands from the master.
The master can be a PC, an industrial control device, or a PLC. The master can
communicate with a single slave or send broadcast messages to all slaves. When the
master communicates with a single slave, the slave needs to return a message
(response) to the query command from the master. For a broadcast message sent by
the master, the slaves do not need to return a response.
2.4 Communication Data Frame Structure
The following figure shows the Modbus‑RTU communication date. The AC drive
supports read and write of word‑type parameters only. The read command is 0x03,
the write command is 0x06, and the multi‑write command is 0x10. The AC drive does
not support read and write of bytes or bits.
Theoretically, the host controller can read multiple continuous parameters at a time
(that is, n is up to 12). Do not stride over the last parameter in this parameter group;
otherwise, an error will be returned.
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