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主从式多机通信是分布式测控系统中上位机与下位机之间进行数据交换的主要手段,使用双绞线对地浮空的差分平衡信号传输是这一类系统完成半双工或全双工通信实现物理层比特流的有效方法。鉴于其对共模干扰的抑制能力及信号灵敏度(≥200mV),使传输信号能在千米之外得以准确恢复。所以该通信方式现广泛应用于二级或多级分布式测控系统。作为分布式测控系统监控站的主机与作为过程站的从机(节点)的连结如图1所示。
Master-slave multi-machine communication is the main means of data exchange between the host computer and the lower computer in the distributed measurement and control system. The differential balanced signal transmission using floating pair to ground is a type of system that performs half-duplex or full An efficient way to realize bit stream of physical layer in duplex communication. In view of its ability to suppress common mode interference and signal sensitivity (≥ 200mV), the transmitted signal can be accurately recovered beyond kilometers. Therefore, the communication method is now widely used in two or more levels of distributed measurement and control systems. As a distributed monitoring and control system monitoring station as a process station and the slave (node) link as shown in Figure 1.