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    • 3. 发明授权
    • Wireless security system
    • 无线安全系统
    • US06310549B1
    • 2001-10-30
    • US09651537
    • 2000-08-29
    • Jon LoftinRichard CraneJerry Crane
    • Jon LoftinRichard CraneJerry Crane
    • G08B1308
    • G08B13/08
    • The present invention is a wireless security system. Each alarm sensor contains three magnetoresistive sensors and that are capable of detecting the three-dimensional vector of a magnetic field. Preferably, the sensors detect the orientation of the door or window based upon the earth's magnetic pole. The three-dimensional vector output of the magnetoresistive sensors is received by a microprocessor on-board the alarm sensor. The microprocessor continuously compares the magnetoresistive sensors output with the maximum allowable position of the door or window. If the magnetoresistive sensors output exceeds the maximum allowable position, the microprocessor will signal an alarm, which is transmitted to the network controller via a transmitter on-board the alarm sensor. If an intruder attempts to disable or override a sensor, the alarm sensor will transmit a tamper signal to the network controller.
    • 本发明是一种无线安全系统。 每个报警传感器包含三个磁阻传感器,能够检测磁场的三维矢量。 优选地,传感器基于地球的磁极检测门或窗的取向。 磁阻传感器的三维矢量输出由微处理器接收在报警传感器上。 微处理器将磁阻传感器输出与门或窗口的最大允许位置进行连续比较。 如果磁阻传感器的输出超出最大允许位置,微处理器将通过报警传感器上的变送器发出报警信号,该报警信号发送到网络控制器。 如果入侵者尝试禁用或覆盖传感器,报警传感器将向网络控制器发送篡改信号。