介绍以8751单片机为核心的通讯控制器,扩展有关信号接口电路,能够识别电话线路上的振铃和DTMF信号,并能根据收到的约定密码信号,接通计算机电源(也可由定时器设置定时开机),运行机内通讯程序,进行数据通讯,通讯结束后自动关机,实现远程数据通讯的无人值守. Introduce 8751 one-chip computer as the core of the communication controller, the expansion of the signal interface circuit that can identify ringing and DTMF signals on the telephone line, and according to the agreed password signal received, turn on the computer power (timer can also be set by the timer Boot), running machine communication procedures, data communications, automatic shutdown after the end of communication to achieve unattended remote data communications.