Main board communicates with all control units through RS-485 communication bus, and they compose a total distributed control system.
主板和控制板之间通过RS - 485总线进行通讯，构成了一个集散控制系统。
Concept 1:485 bus communication interval to reach 1200 meters.
概念一：485总线的通讯间隔能够到达1200米。
It studies the intelligent sub-station about its hardware and software structure, detailedly analyses RS-485 bus communication technique and bi-port RAM arbitration technique.
研究了智能分站的硬件和软件结构，详细分析了RS - 485总线通讯技术、双端口ram仲裁技术。
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