| 摘要 |
PURPOSE: A fire sensing and warning system having a camera module is provided to improve reliability of fire sensing and warning actions and to help a manage rapidly confirm an action of a sensor and an image which films circumference. CONSTITUTION: A communication loop (10) comprises a (+) line (11) and a (-) line (12). The (+) line transmits operating voltage which is provided from an interface unit and a digital call signal which is transmitted from a main control panel. The (-) line is arranged with the (+) line in parallel and becomes reference voltage of the (+) line. All kinds of fire sensors are connected to the (+) line and the (-) line of the communication loop. The fire sensor senses a specific condition from a surrounding environment by being driven with the operating voltage of the (+) line and produces a measured value. The interface unit comprises a control communication terminal (35), a power source terminal, a loop A terminal, and a loop B terminal. The control communication terminal receives the digital call signal from the main control panel. The power source terminal is receives the operating voltage from an external power source. The loop A terminal connects one side ends of the (+) line and the (-) line of the communication loop. The loop B terminal connects the other ends of the (+) line and the (-) line of the communication loop. The main control panel outputs the digital call signal for successively selecting the multiple fire sensors connected to the communication loop. [Reference numerals] (31) Loop A terminal; (311,321) (+) terminal; (312,322) (-) terminal; (32) Loop B terminal; (35) Control communication terminal; (36) Power terminal; (40) Main control panel; (P) External power supply |
