Input condition sensing circuit
    7.
    发明授权
    Input condition sensing circuit 失效
    输入状态检测电路

    公开(公告)号:US5027057A

    公开(公告)日:1991-06-25

    申请号:US472022

    申请日:1990-01-30

    IPC分类号: G01R19/155

    CPC分类号: G01R19/155

    摘要: There is disclosed an input condition sensing circuit for use in a facility management system which is selectively operable in a first mode for sensing the presence or absence of a voltage potential or a second mode for sensing a high or low impedance and which provides a binary output signal indicative of the condition being sensed and an amplifier coupled to the input for generating a control signal having an amplitude relating to the input condition being sensed. The circuit also includes detecting means coupled to the amplifier for providing a binary output in response to the control signal and indicative of the condition being sensed and select means coupled to the detecting means for selectively conditioning the circuit for operating in either the first or second mode. The select means is arranged to cause the detecting means to provide a first binary output state in response to sensing the presence of a voltage while in the first operating mode and a cause the detecting means to provide a different binary output state in response to sensing a high impedance while in the second operating mode.

    摘要翻译: 公开了一种在设备管理系统中使用的输入条件感测电路,该设备管理系统可选择性地在第一模式下操作以感测电压电位的存在或不存在,或用于感测高阻抗或低阻抗的第二模式,并且提供二进制输出 指示所检测的状况的信号和耦合到所述输入的放大器,用于产生具有与所感测的输入条件相关的振幅的控制信号。 电路还包括耦合到放大器的检测装置,用于响应于控制信号提供二进制输出并指示正在感测的状况,并且选择装置耦合到检测装置,用于选择性地调节电路以在第一或第二模式 。 选择装置被布置成使得检测装置响应于在第一操作模式期间感测电压的存在而提供第一二进制输出状态,并且使得检测装置响应于感测到的第二输出状态而提供不同的二进制输出状态 在第二种工作模式下具有高阻抗。