The electric power modem is a very common used communication device in electric power automatic system, mainly used in transform station distributed control system, electric power bureau, dispatch center, front-end computer''''''''s data communication, as well as widely used in petroleum, metallurgy, environmental protection and other fields which are in need of SCADA distributed data acquisition, remote control, remote communication system. SMM modem driver is a multi-function modem driver which suits to data transmission of dispatch automation in electric power system. It applies to the synchronous or asynchronous data transmission on the electric power carrier wave channel, microwave channel, optical channel, lightning on communication cable and specialized channel. This modem driver adopts FSK digital modem way and the newest modem driving technique, thus leads more perfect function, more flexible usage, stronger adaptation, and higher stability and reliability.