Goodrive30 Series VFD Communication protocol
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7.6 Common communication faults
Common communication faults include the following:
No response is returned.
The VFD returns an exception response.
Possible causes of no response include the following:
The serial port is set incorrectly. For example, the converter uses the serial port COM1,
but COM2 is selected for the communication.
The settings of the baud rates, data bits, stop bits, and check bits are inconsistent with
those set on the VFD.
The positive pole (+) and negative pole (-) of the RS485 bus are connected reversely.
The resistor connected to RS485 terminals on the terminal block of the VFD is set
incorrectly.
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