Common communication faults: no response to the communication or the VFD returns abnormal fault.

The possible reasons for no response to the communication:

Select wrong serial port: for example, if the converter is COM1, select COM2 during the communication;

The baud rate, digital bit, end bit and check bit are not the same with the VFD;

+ and - of RS485 are connected in reverse;

The 485 wire cap on the terminal board of the VFD is not plugged in. The wire cap is behind the terminal block.