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针对我国小企业的特点,提出了以RS-485总线方式的测控网络,给出了测控网络的网络结构.PC主机使用Visual Basic软件开发,重点讨论了利用VB的MSComm通信控件实现PC机与多测控节点之间的通信.“,”A network configuration of measurement and control system of RS-485 Bus is represented based on the characteristic of small enterprise in china. Using Visual Basic,we have developed a main control system of PC. Communication between a computer and network nodes is mainly discussed.