串口检测程序。。。知道串口是怎么工作的吗 ？？连接好电路后看看串口是否工作呢。。检测一下你就知道了。。实现发送什么接受什么-Serial testing procedures. . . Know how the work of serial port is it? ? Circuit connected after work to see whether the serial port. . Detection of what you know. . What is acceptable to