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介绍了现场总线技术的优点及发展概况，论述了一个现场总线通信网的设计． 该通信网的总线介质采用双绞线，遵循 Ｒ Ｓ－ ４８５ 通信协议，服务器端采用 Ｍｏｘａ 公司的 Ｃ－ １０２ Ｈ 通信卡与总线相连，各个现场设备本身具有 Ｒ Ｓ－ ４８５接口，用接线端子挂接在总线上，整个通信网采用主从式通信方式．
The advantages and development of fieldbus technology are introduced. The design of a fieldbus communication network is discussed. The communication medium uses twisted pair as the bus media. According to the R-485 communication protocol, the server uses Moxa’s C-102 H communication card to connect with the bus. Each field device has an R S-485 interface and is connected with a terminal Connected to the bus, the communication network using master-slave mode of communication.