Real-time data acquisition is a basic and important link in industrial control field.
在工业控制领域，实时数据采集是一个基本而且重要的环节。
The structure of physical layer, link layer and application layer was applied in field-bus of network control, data was gained through cyclic query of principal and subordinate PC in link layer.
控制网络现场总线采用物理层、链路层和应用层结构。链路层以主从循环查询获取数据。
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