双机冗余系统采用主备机原则运用软件方式通过串口相互通信，达到实时检测的功能，能够保证系统的可靠性。即使有一台机子出现故障的情况下也不影响系统的正常运行，而通过串口通信的方式代替常规的检测转换设备，不仅可以解决转换设备本身出错的瓶颈问题，还在很大程度上节约了成本，因此有很好的实用推广价值。-double-redundant system uses the main principles for the use preparation software through the serial form of mutual communication, to achieve real-time detection function, to guarantee the reliability of the system. Even though they have a machine failure of the case does not affect the normal operation of systems, and through serial communications, instead of converting conventional detection equipment, not only can solve their own mistakes conversion equipment bottlenecks, but also very much cost savings, it is a good practical value.