“嫦娥四号”载荷通信管理的时间片模式方案

A time slice payload communication mode based on RS422 bus for Chang’e-4 rover

针对“嫦娥四号”巡视器有效载荷电控箱系统RS422总线通信的特殊性,在分析目前RS422总线通信技术现状以及存在问题的基础上,提出了一种基于RS422时间片管理机制的通信模式,初步满足了“嫦娥四号”巡视器有效载荷RS422总线通信的时间响应要求,保证了数据传输的有序、有效性。该通信模式是单片机RS422总线通信架构的新尝试,实践证明其能够满足系统要求,可以应用推广。

This paper analyzes the RS422 communication structure of the rover payload electric control box system of Chang’e-4 probe,including the current technology and the problems of the RS422 communication.In view of the special feature of the RS422 communication in the system,a communication mode of the time slice management mechanism based on RS422 is proposed.It answers the time response requirement in the RS422 communication,ensures the orderly and effective data transmission and the realization of the RS422 normal communication.This mode is a new attempt of a single-chip microcomputer architecture.The practice shows that the mode can meet the system requirements and can be applied widely.