本文分析了当今带专用检测转换电路的双机冗余系统存在的可靠性问题，提出了利用双机的串行口代替专用检测转换电路，通过串行通信相互检测主备机工作状态，由软件完成备机切换成主机的新型设计思想，为计算机在工业实时监控系统应用中的可靠性开辟新的思路。-This paper analyzes the current detection with exclusive conversion circuit for the double-redundant system of reliability, the use of two aircraft to replace the dedicated serial port detection circuit, and Serial communication through mutual detection equipment for the main work state, completed by the software into switching equipment for the new mainframe design ideas, in the computer industry for real-time monitoring system application of reliability open up a new way of thinking.