Open Fire Alarming Networks System Research

With the development of the city construction, the fire happening chance is increasing continuously.Currently, a fire probe installed in each building and the fire fight facilities have an important function in discovering a fire and preventing a fire in earlier period. But because of the product poor quality and equipments management, the fire fight system can't have an effective function. To the fire fight industry, how to make the computer data communication technique applied to a fire probe in order to report to the police system in time, so that make use of the network protocol and use of a social information resources well, exchange the system inner part and the data information of of the exterior in time, and to constitute a city of dynamic state ,the community of having a fire probe of the multilayers to report to the police rescue,management, the service network information system, is the topic that needs to be solve at present.The communicatoin protocol don't unify in current fire fight network system and the building automation system don't bring into with the fire fight system is the problem that needs to be resolve urgently more.In order to resolve this problem, this thesis puts forward open fire fight network system, this system makes use of serial interface that almost the current equipments have, and uses serial interface transforms other field bus conjunction equitment, and programs to them ,so that makes the fire fight network system can communication with exterior equipments.The open fire fight network system has the open communication protocol, the field bus can be substituted freely, being easy to link with the existing network.and it is a better project of resolving the existing fire fight network system problem.This research is divided into two parts. The first part is a fire fight alarming sub- system, using ATmega128 as the lord of the fire fight host control unit, ATmega8 as the lord of the sensor control unit, personal computer as amonitor computer, combining the new RS485 field bus and its outer electric circuit, and makes the fire fight host to communication with the sensor to collect the data ,to manifestate and to alarm.The second part is the fire fight control sub- system, using programmable controller(PLC) as the fire fight driver controller, taking one typical PLC from America, Europe and Japan that three main producting PLCs' nations and discussing these PLCs how to communicate with the fire fight network system, that make it at the fire fight alarm to drive the fire fight equipments.The experiment proves the open fire fight network system is viable.This thesis discusses the basic principle of the open fire fight network system and the concrete method and the open fire fight network system of it's realization and control method and the important point of the equipments communication with existing equipments in detail.With three kinds of programmable controllers, SLC505.S7—200 and FX2N as the example.this thesis discusses concrete procedure to link with hardware.AII electric circuit diagrams and programs are given in the appendix.This research involves a micro control unit, the network communication, the industry control system and PLCs etc. and in the aspect how to make a network connect with each other in different type equipments.the thesis puts forward the novel method and technique particularly and it has better reference value.