Goodrive300-21 integrated machine for air compressor Communication protocol
-106-
Parameter cannot
be modified in
running
The parameter to be modified in the write operation of the upper
computer cannot be modified during the running of the inverter.
If the upper computer does not provide the correct password to
unlock the system to perform a read or write operation, the error of
“system being locked” is reported.
When returning a response, the slave uses a function code domain and fault address to indicate
whether it is a normal response (no error) or exception response (an error occurs). In a normal
response, the slave returns the corresponding function code and data address or sub-function code.
In an exception response, the slave returns a code that is equal to a normal code, but the first bit is
logic 1.
For example, if the master sends a request message to a slave for reading a group of function code
address data, the following code is generated:
0 0 0 0 0 0 1 1 (03H in the hexadecimal form)
In a normal response, the slave returns the same code. In an exception response, the slave returns
the following code:
1 0 0 0 0 0 1 1 (83H in the hexadecimal form)
In addition to the modification of the code, the slave returns a byte of exception code that describes
the cause of the exception. After receiving the exception response, the typical processing of the
master is to send the request message again or modify the command based on the fault information.
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