请使用串口调试助手（Baud 4800、数据位8、停止位1、效验位无）做为上位机(发送)数据和(接受)数据，请在字符串输入框中输入字符和数字(HEX),按发送按钮-Please use serial debugging assistant (baud 4800, data bits, stop bit 1, no efficacy bit) as the host computer (send) data and (accept) data, please press the send button in the string input box, enter the letters and numbers (HEX).