Patent ID: 8319600

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 first sensors; a plurality of second sensors; a plurality of input devices, wherein a sum of the plurality of first sensors and the plurality of second 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 first sensors or one of the plurality of second 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 first sensors and a voltage source in series or connected to one of the plurality of second sensors and a current source in series, wherein when an input device is connected to a first sensor, the switching circuit receives a voltage signal of the first sensor and sends out a first detection signal, the input circuit transmits the first detection signal to the controller; when the input device is connected to a second sensor, the switching circuit receives a current signal of the second sensor and sends out a second detection signal, the input circuit transmits the second detection signal to the controller; a plurality of first alarms connected to the corresponding output terminals of the controller, wherein a number of the plurality of first alarms is equal to the number of the plurality of first sensors, the controller controls a first alarm according to the first detection signal; and a plurality of second alarms connected to the corresponding output terminals of the controller, wherein a number of the plurality of second alarms is equal to the number of the plurality of second sensors, the controller controls a second alarm according to the second detection signal.