INVT Goodrive300-01A Series Operation Manual page 182

Goodrive300-01A series VFD for air compressor
Code Name
error
Written
07H
allowed.
Parameter
cannot be
08H modified
during
running
Password
09H
protection
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:
For normal responses, the slave responds the same codes, while for objection responses, it will
return:
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.
different from the lower computer.
It only happen in write command, the reason maybe:
1. The written data exceeds the parameter range.
not
2. The parameter should not be modified now.
3. The terminal has already been used.
The modified parameter in the writing of the upper computer cannot
be modified during running.
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.
0 0 0 0 0 0 1 1 (Hex 03H)
1 0 0 0 0 0 1 1 (Hex 83H)
Meaning
-176-
Communication protocol