Frequency Inverter ST600 Series High-Performance Multifunction VFD Communication protocol
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Note: The sections 9.4.1 and 9.4.2 mainly describe the command formats. For the detailed application,
see the examples in section 9.4.7 "Read/Write operation example".
9.4.3 Command code: 10H, continuous writing
The command code 10H is used by the master to write data to the VFD. The quantity of data to be
written is determined by "Data quantity", and a maximum of 16 pieces of data can be written.
For example, to write 5000 (1388H) and 50 (0032H) respectively to 0004H and 0005H of the VFD
whose slave address is 02H, the structure of the frame is described in the following table.
RTU master command (transmitted by the master to the VFD)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
MSB of data writing address
LSB of data writing address
MSB of data to be written to 0004H
LSB of data to be written to 0004H
MSB of data to be written to 0005H
LSB of data to be written to 0005H
T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU slave response (transmitted by the VFD to the master)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
MSB of data writing address
LSB of data writing address
T1-T2-T3-T4 (transmission time of 3.5 bytes)
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