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本文介绍一种可用于工业、水利、能源、仓库等方面遥测、遥控的分布式星形拓扑通讯结构。设计指导思想是在硬件价格不断下降的情况下,在两级分布式控制系统中使用一个通讯控制机,以降低主机系统的通讯开销,用并发式工作提高通讯网络的吞吐量,提高通讯效率。使用了通讯控制机也大大增加了系统的灵活性,通过标准RS—232C接口可以与IBM—PC、APPlE—Ⅱ、TRS—8D(Ⅰ)等不同系统机相连,构成异型机通讯网络的物理环境。
This article presents a distributed star topology communication structure that can be used for telemetry and remote control in industry, water conservancy, energy, warehouses, etc. The design guideline is to use a communication control machine in a two-level distributed control system under the condition of decreasing hardware prices to reduce the communication overhead of the host system, and to improve the communication efficiency by using the concurrent work to improve the throughput of the communication network. The use of communication control machine also greatly increases the flexibility of the system through the standard RS-232C interface with IBM-PC, APPlE-Ⅱ, TRS-8D (Ⅰ) and other systems connected to form the physical environment of the machine communication network .