Goodrive18 series two-in-one VFD Communication
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RTU master command (from the master to
the VFD)
RTU slave response (from the VFD to the
master)
MSB of to-be-written
data
MSB of to-be-written
data
LSB of to-be-written
data
LSB of to-be-written
data
Note: Sections 7.3.1.1 and 7.3.1.2 mainly describe the command formats.
7.3.1.3 Command code 08H (0000 1000), diagnosis
Sub-function code description:
Return data based on query requests
For example, to query about the circuit detection information about the VFD whose address is
01H, the query and return strings are the same, and the format is described as follows.
MSB of
to-be-written data
MSB of
to-be-written data
LSB of
to-be-written data
LSB of
to-be-written data
7.3.1.4 Command code 10H, continuous writing
Command code 10H means that the master writes data to the VFD while the number of data
pieces depends on the "data count" in the command code. A maximum of 16 pieces of data
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