基于RS-485的多机串行通信系统的设计

本文详细介绍了基于RS-485总线的PC和多单片机的串行通信方法,讨论了总线接口转换、主从式通信协议设计方法,并给出了采用中断方式处理的通信过程流程图;文中还提出了差错控制以及硬件设计中总线隔离、失效保护、电磁干扰问题等几个要注意的问题及解决方法。笔者在多媒体网络广播系统中采用上述方法,取得了良好效果。

Design of Multiple MCUs Communication System Based on RS-485

The communication between PC and multiple MCUs based on RS-485 is described in detail in the article. The bus interface conversion and the design of master-slave communication protocol is introduced. The program flowchart of communication with interrupt process is given. The article also describes some important problems for hardware design, then it provides the method, such as error control, bus insulation, invalidation protection and electromagnetism interfere. The authors use the above technology in the multimedia network broadcast system effectively.