针对两算机之间串行异步通信问题开展研究,用C语言设计了仅用RXD、RXD、GND三线进行串行通信的程序。该程序通过合理设置INS8250端口的初始状态,发送方采用查询方式,接收方引入中断机制,使三线通信方式得以实现,且硬件连线简单,数据传输波特率可达115200bps的最高极限值。-Computer for the two serial asynchronous communication between the research problem, using C language designed only RXD, RXD, GND three-wire serial communication procedures. The program through a reasonable set of initial state INS8250 port, the latter means the use of inquiry, the receiver interrupt the introduction of mechanisms to enable three-way communication to achieve, and a simple hardware connection, data transmission baud rate up to the maximum limit 115200bps.