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本系统采用DELPHI编程实现管理数据库的开发,存储用户的档案信息,同时通过RS-232串行口发出对终端的控制命令。数字化控制命令由RS-232串口送调制电路板进行射频FSK调制,传输载频使用空闲频点,中心频率为100MHz,此信号-1-与有线电视信号混合后进入同轴电缆网络(CATV)传输;分支分配器同时负责接收、识别信息,实现各种控制信号及广播功能。
The system uses DELPHI programming management database development, storage of user files, at the same time through the RS-232 serial port issue control commands on the terminal. Digital control command sent by the RS-232 serial modulation circuit board RF FSK modulation, the use of idle frequency carrier frequency transmission, the center frequency of 100MHz, the signal -1- and cable television signal into the coaxial cable network (CATV) transmission Branch distributor is also responsible for receiving, identifying information, to achieve a variety of control signals and broadcast capabilities.