一种高可靠的RS422应用通信方法设计与实现

Design and Implementation of a Highly Reliable RS422 Application Communication Method

RS422是航空电子系统中广泛使用的一种串行总线,可同时实现通信双方的数据发送与接收。但RS422缺少统一的数据传输规范,通信过程中易出现响应不及时以及丢包现象,针对这一问题设计了一种可靠性更高的应用通信方法,通过使用周期任务提高消息响应速度、利用消息重发机制以及丢弃失效消息来降低消息的丢包率。该方法的可行性高、适用性强,可广泛应用于机载软件领域。

RS422 is a kind of serial bus widely used in avionics system,which can simultaneously realize the data transmission and reception of both communication parties.However,RS422 lacks a unified data transmission specification,so it is easy to appear the phenomenon of delayed response and packet loss in the communication process.Aiming at this problem,this paper designed an application communication method with higher reliability,which can improve the message response speed by using periodic tasks,and reduce the packet loss rate by using message resending mechanism and discarding invalid messages.This method has high feasibility and applicability,and can be widely used in the field of airborne software.