Patent ID: 8314679

Claim:
A monitoring system, comprising: a controller comprising a plurality of input terminals, a plurality of output terminals, and a plurality of control terminals; a plurality of digital sensors; a plurality of analog sensors; a plurality of input devices, wherein a sum of the plurality of digital sensors and the plurality of analog sensors is equal to a number of the plurality of input terminals of the controller, each input device is connected between an input terminal of the controller and one of the plurality of digital sensors or one of the plurality of analog sensors, each input device is also connected to a control terminal of the controller, each input device comprises a switching circuit, an input circuit, and a connector, the connector is connected to one of the plurality of digital sensors or connected to one of the plurality of analog sensors and a first power source in series, wherein when an input device is connected to a digital sensor, the switching circuit receives a digital signal of the digital sensor and outputs a first detection signal, the input circuit transmits the first detection signal to the controller; when the input device is connected to an analog sensor, the switching circuit receives an analog signal of the analog sensor and outputs a second detection signal, the input circuit transmits the second detection signal to the controller; a plurality of first alarms connected to some of the plurality of output terminals of the controller, respectively, wherein a number of the plurality of first alarms is equal to the number of the plurality of digital sensors, the controller controls a first alarm according to the first detection signal; and a plurality of second alarms connected to the others of the plurality of output terminals of the controller, wherein a number of the plurality of second alarms is equal to the number of the plurality of analog sensors, the controller controls a second alarm according to the second detection signal.