Goodrive300-01A series VFD for air compressor
Communication protocol
-176-
Code
Name
Meaning
error
different from the lower computer.
07H
Written
not
allowed.
It only happen in write command, the reason maybe:
1. The written data exceeds the parameter range.
2. The parameter should not be modified now.
3. The terminal has already been used.
08H
Parameter
cannot be
modified
during
running
The modified parameter in the writing of the upper computer cannot
be modified during running.
09H
Password
protection
When the upper computer is writing or reading and the user
password is set without password unlocking, it will report that the
system is locked.
The slave uses function code fields and fault addresses to indicate it is a normal response or some
error occurs (named as objection response). For normal responses, the slave shows corresponding
function codes, digital address or sub-function codes as the response. For objection responses, the
slave returns a code which equals the normal code, but the first byte is logic 1.
For example: when the master sends a message to the slave, requiring it to read a group of address
data of the VFD function codes, there will be following function codes:
0 0 0 0 0 0 1 1 (Hex 03H)
For normal responses, the slave responds the same codes, while for objection responses, it 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
command.
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