Goodrive300 Series VFD Communication protocol
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RTU master command message (from the master to the VFD)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
High bit of writing data address
Low bit of writing data address
T1-T2-T3-T4 (transmission time of 3.5 bytes)
RTU slave response message (from the VFD to the master)
T1-T2-T3-T4 (transmission time of 3.5 bytes)
High bit of writing data address
Low bit of writing data address
T1-T2-T3-T4 (transmission time of 3.5 bytes)
Note: section 10.2 and 10.3 mainly describe the command format, and the detailed application will be
mentioned in 10.8 with examples.
10.4.3 Command code 08H for diagnosis
Meaning of sub-function codes
Return to inquire information data
For example: The inquiry information string is same as the response information string when the loop
detection to address 01H of driver is carried out.
The RTU request command is:
T1-T2-T3-T4 (transmission time of 3.5 bytes)
High bit of sub-function code
Low bit of sub-function code
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