1、Log in to the system background through the serial port，you need to use the board’s Debug interface，Interface locations and definitions are shown：

* Only three pins are needed for the interface，TX、RX、GND

2、You need to use the serial pad tool

• TX、RX and GND need to be connected to part A
• Part B Connects to the USB port on the computer

3、Hardware part connection effect diagram

4、Check for serial port information in the Decive Manager port of your computer

5、Open Xshell create a new session，select protocol as under connection SERIAL,operation figure：

6、Click serial port，the port number is the serial port number seen by the device manager，the baud rate is：1500000

7、Finally click Connect,the serial port into the background