不仅串口的正常通信，还实现双串口透传，这个在你不知道控制设备的通信格式的时候通过将输入接入一个串口，输出接到一个串口，就可以在你的计算机上看到实际的通信报文。我就是有这种需求才作的。-not only the normal serial communication, but also to achieve double-Serial thoroughly, in this you do not know the communication control equipment format of the input access through a serial port, a serial port output received, you can see the actual computer communications packet. I just have that kind of demand before.