Read/Write Operation Example; Examples Of Reading Command 03H - INVT Goodrive20-EU Series Operation Manual

Goodrive20-EU Series VFD Communication protocol
will return:
1 0 0 0 0 0 1 1 (Hex 83H)
Besides the function codes modification for the objection fault, the slave will respond a byte of
abnormal code which defines the error reason.
When the master receives the response for the objection, in a typical processing, it will send
the message again or modify the corresponding order.
For example, set the "running command channel" of the VFD (P00.01, parameter address is
0001H) with the address of 01H to 03, the command is as following:
Parameters
VFD Parameters
Write
CRC check
data
address address
command
But the setting range of "running command channel" is 0–2, if it is set to 3, because the
number is beyond the range, the VFD will return fault response message as below:
VFD Abnormal
Fault code CRC check
response code
address
Abnormal response code 86H means the abnormal response to writing command 06H; the
fault code is 04H. In the table above, its name is operation failed and its meaning is that the
parameter setting in parameter writing is invalid. For example, the function input terminal
cannot be set repeatedly.

7.5 Read/Write operation example

7.5.1 Examples of reading command 03H

Example 1: Read the state word 1 of the VFD with the address of 01H (see section 7.4.2
"Description of other function addresses in Modbus"). The parameter address of the state
word 1 of the VFD is 2100H.
RTU mode:
The command sent to the VFD:
VFD Parameters
Read
Data number
CRC check
address
address
command
If the operation succeeds, the response message is as follows:
VFD
Data
Read Data content
CRC check
address
address
command
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