SPT series Protocol Converter mainly be used to centralized management of various of protective relays device and other intelligent devices,as well as to convert the communication protocol. Through many kinds of standard communication interface to have data communication with relay protection,fault recorders, watt-hour meter, DC screen and so on devices, then send to background control system by networt or serial port, or send to remote dispatching center by modem after program processing. It is suitable to extremely adverse condition, and can be widely used to distributed data acquisition and transmission of all levers electric power automation system.