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

The possible reason for no response to the communication:

Selecting wrong serial interface, for example, if the converter is COM1, selecting 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 plug in. the wire cap in behind the terminal arrangement.