设计一串口通信程序，波特率9600，通过RS232串口自环。自动循环发送数据串（设计在程序中）接收并存储和显示该数据串发送数据内容由键盘输入，每串数据不大于8字节。数据串单次发送由按键启动，接收端显示数据串并存储。可查询、清楚已存数据串-The design of a serial communication program, baud rate 9600, through the RS232 serial ring. Automatic cycle to send data string (design program) to receive and store and display the contents of the data string to send data from the keyboard input, each string of data is not greater than 8 bytes. Series of single data sent by the button to activate the receiving end to display the data string and stored. Query, clear existing data string