Retrofit of RTU communication network

The retrofit scheme of RTU(Remote Terminal Units)communication network is presented,which connects RTU with dispatch data network via an added serial-port/Ethernet converter. The DNP3.0 protocol is based on the OSI 7-layer model and its physical layer,data link layer and application layer are of EPA(Enhanced Performance Architecture). The physical layer defines the interface of RS-232 or RS-485,the data link layer defines the format of the information and the application layer defines the functions. The configuration of substation for network-accessing is discussed,including the setting of RTU and converter,the connections between devices,and so on. No modification of RTU hardware or protocol is needed. Test result shows its feasibility.