If the RT88H01 cannot communicate after configuring parameters, you can restore the board to factory settings

1 Connect the board with DC 5-12V power supply and USB to RS485

2 Use conductive tweezers or wires to short-circuit the two ports of the CMD, and the RX and TX LEDs will light up at the same time

3 Send AT+RESET command under the baud rate parameter ( 9600 8 N 1)

4 Restore factory settings after power on