2. Configure the "com" port: it should be consistent with the corresponding com slogan in the device manager. Configure the baud rate, which should be consistent with the communication protocol.

3. There are "stop positions" and so on. Most of these parameters are related to the communication protocol. Please refer to the relevant regulations.

4. But in most cases, only Baud Rate is configured.

5. Configure other functional parameters, such as "16 basic display" and "black words on white background". Choose according to your own needs. Generally not configured.

6. After the configuration, it is OK to open the serial port.

7. The black window on the surface shows the received data. Write the data to be sent in the Send field, and then click Send. Pay attention to whether there are spaces, enter and other keys.