基于令牌总线网络的RS485应用

Application of RS485 in Token-based Bus Network

应用RS 485物理层标准,构建总线型的控制网络,采用令牌方式实现总线的共享访问,以适应控制网络实时性要求。在进行令牌总线协议设计时,从RS 485特点出发,以特殊的设计来简化协议,提高协议的效率。为了保证网络的可靠性,在协议中采用了有效的错误处理方法,即保证数据传输的正确性,又减小了协议的控制开销,以简单、方便、快捷、高效的方式实现控制网络的介质访问管理,给RS 485网络提供一种较好的连网模型。

RS 485 physical layer standard is applied to build bus topolopy control network,token bus is adopted in this network to realize multiple access in order to meet real - time request of control network. At the time of designing bus token protocol, we set out from RS 485 characteristics, with a special design to simplify the protocol, increase the efficiency of the protocol. For the sake of the network dependability, we adopt the valid mistake handling method in protocol to guarantee the data transmission,reduce the control expense of the protocol, with simple, convenient, fast and efficient way to realize the control network multiple access,providing a network RS 485 model.