Modbus 协议是应用于电子控制器上的一种通用语言。通过此协议，控制器相互之间、控制器经由网络（例如以太网）和其它设备之间可以通信。它已经成为一通用工业标准。有了它，不同厂商生产的控制设备可以连成工业网络，进行集中监控-Modbus protocol is applied to electronic controller, a common language. Through this agreement, between the controller, the controller via the network (eg Ethernet) and other devices can communicate. It has become a common industry standard. With it, different manufacturers of industrial control equipment can be connected into a network for centralized monitoring