Application of serial communication based on Modbus protocol

Lacking of decentralized management of the field data collection,for industrial control field,the paper using the Modbus RTU communication protocol and serial communication technology,designed a collection system of master-slave communication,and realized remote centralized monitoring of each scene,that is distributed control system.It Elaborated the realization of master-slave communication based on Modbus RTU communication protocol between host computer and the DAM-3504 series three-phase multifunction power collection modules in the C # environment through the GPRS network.After field testing and validation,with the stable operation of the program,easy to operate,real-time displaying of the data collected,solved the problem of unified on-site monitoring and distributed management,it provides a feasible plan for the industrial control field.