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terminal charges 上貨[卸貨]費。

terminal check valve

The catv charge and control system is mainly composed of the management software 、 the header data modulator and the terminal charge and control equipment . i am responsible for design catv charge and control equipment and test system . the header data modulator is used to encrypt the control single from computer and transmit it into the appointed frequency . the terminal charge and control equipment demodulate out the control single from data modulator and transmit it to the addressing control part , where the demodulated fsk single is received and well - handled by the cpu unit , decode the unauthorized signals and deliver it to the shut point , shut point make use of capability of wideband anf characteristic of shut , then the signal of illegal customer will be turn off and vice versa , the legal customer can receive the normal signal 前端數據調制器完成對計算機輸出的控制信號加密處理,將指令碼載送到一指定頻率點。終端收費控制器解調出控制信號,送至單片機尋址控制部分。單片機尋址控制部分接收經fsk數據解調器送來的信號,送入cpu單元后,解出不授權信號,然后向關斷部分送入信號,關斷部分利用pin二極管的寬帶工作能力以及關斷特性,實現對非授權用戶或者非法用戶的信號關斷,使之不能正常收視,繳費用戶進行開通正常收視,達到控制用戶通道的管理。