Construction scheme of networked alarm system in t

With the rapid development of intelligent buildings and the continuous change of people's security concept, how to establish an efficient and perfect joint alarm system has become a problem that must be solved. This paper mainly talks about the construction scheme of alarm system in intelligent community, discusses the local alarm system and alarm receiving center of users, and focuses on the construction scheme of alarm receiving center

1. Overview

the rapid development of computer technology, automation technology and communication technology provides technical support for the development and improvement of intelligent buildings. With the deepening of people's concept of security, the construction of combined alarm system has become the focus of today's intelligent community construction, and the perfection of the system has also become one of the important basis to measure the environment of intelligent community

in the intelligent community, a complete alarm system mainly includes: the user's local alarm system, the alarm technology center and the data interaction channel connecting the two. The user's local alarm system sends the alarm information to the alarm receiving center of the linked alarm system through the data interaction channel. The alarm receiving center processes the received alarm information, and immediately reports to DuPont Hongji after identifying and confirming the alarm situation. In combination with its development strategy, it has established the "environmental protection and new energy utilization biaxially stretched polyester film project" and taken corresponding measures. The overall picture of the system is shown in the figure below

2. The user's local alarm system

the user's local equipment is composed of a beautiful appearance controller, an alarm controller, and a channel (refers to the electrical connection between the detector and the alarm controller for data exchange, such as wired connection, wireless connection, etc.). The specific installation location can be selected according to the corresponding user needs

2.1 detector

(L) indoor sensing detector

① thermal infrared detector:

there are two types of molecular type and thermal type, which are used to detect human activities. The alarm signal can be transmitted to the control host, and the on-site alarm can also be carried out

② light detection action detector:

use the differential detection device composed of two photocells or photoelectric crystals to detect small changes in the surrounding light. The alarm signal can be transmitted to the control host, and the on-site alarm can also be carried out

③ the future development trend of ultrasonic glass breaking medical packaging is to speed up the product upgrading of the packaging system. The detector

can prevent the large-scale window glass that can be safely used. When the glass is broken, the detector can transmit the alarm information to the control host

④ microwave object movement detector

uses the Doppler frequency shift of UHF radio waves to detect, which is suitable for open space or square. When an alarm is detected, it can transmit the alarm signal to the control host, and it can also give an on-site alarm

⑤ ultrasonic object movement detector

uses Doppler effect to detect whether there is object movement. When an alarm is detected, it can transmit the alarm signal to the control host, and it can also give an on-site alarm

⑥ proximity detectors

have three types: electromagnetic, capacitive and photoelectric. It is mostly used in anti-theft system, and can be used for fixed-point detection. When the alarm is detected, the alarm signal can be transmitted to the control host, and the on-site alarm can also be carried out

⑦ vibration detector

has two types of mechanical inertia and piezoelectric effect, which are used to detect vibration. When an alarm is detected, it can transmit the alarm signal to the control host, and it can also give an on-site alarm

(2) perimeter detector

perimeter detector is a special kind of detector. It is composed of several detectors that can sense the intrusion of the perimeter, which is called "electronic fence". There are many classification methods of perimeter detectors, such as hidden and visible, passive and active, spatial and linear, and so on. The perimeter detector can transmit the alarm signal to the control host, and can also give an on-site alarm

2.2 alarm controller

the alarm controller is located at the user end and can deploy and disarm the user. When it is in the armed state, the detector is in the working state. If an alarm is triggered, the alarm bell connected to the host will give an alarm. Each loop terminal adopts the anti damage function, which can immediately cause an alarm for any attempt to cut or short-circuit the cable. Some products can trigger and start the camera in the relevant defense area when an alarm occurs. The control host can transmit the above information (including images) to the alarm receiving center by wired or wireless means through the communication channel. The reported information can be set in three forms: dual report, self prepared report and classified report

2.3 communication channel

communication channel can be divided into wired connection and wireless connection according to the connection mode between the user's local alarm system and the alarm receiving center. Wired connection can be realized through special alarm channel, TVx video or public networks such as PSTN, DDN, ISDN or X25. The dedicated channel wireless connection can use the dedicated radio for alarm, or other wireless, such as public mobile communication. At present, most of the data interaction channels of domestic alarm systems use PSTN, alarm dedicated line and alarm dedicated radio, but other connection methods have also begun to be widely used

3. Connect to the alarm receiving center

3.1 the function of the alarm receiving center

for an alarm receiving center, it should mainly have the following functions:

(L) alarm receiving function

the alarm receiving center software can receive the alarm report sent by the client, and at the same time of display, it will automatically alarm the central operator in the form of sound and light, so that the alarm can be handled in time

(2) alarm handling function

when the alarm receiving software sends an alarm, the alarm receiving personnel can mobilize 110 or their own police handling personnel to the scene of the crime and deal with the alarm according to the user information provided by the software, so as to realize the organic combination of technical defense and civil defense

(3) management function

the alarm receiving center can manage incoming users according to user requirements and actual needs, provide startup and shutdown services, and judge the working conditions of front-end equipment and control host according to various status reports

(4) comprehensive coordination and scheduling function

the front-end equipment of the client can not only provide anti-theft