An analysis of the security alarm system bus and bus detector advantage (1)

As times change, people on security requirements, to promote the security field alarm technology progress.

Traditional burglar alarm system and installation have been derived from the challenges of new technology, which relies on the construction and installation of facilities, capital investment and maintenance advantages of simple late, a wave after wave of shock with traditional technology. For details, please see below for details.

Existing system bus challenge

Nowadays people need safe and comfortable living and working environment, their personal and property safety needs to be protected; Governments, enterprises, agencies and other bodies of the institution, or even a country property in need of protection.

With modern high-tech advances, as well as prevention awareness of, all kinds of security facilities came into being. Where the security alarm system is the most important and the most representative one security facilities.

Throughout the burglar alarm systems, intrusion detectors majority adopt front end sub line connections and system controller and zone expansion modules for communication connected, which causes the system connection limitations, construction and debugging of complexity, as well as wire and construction costs of personnel, etc.

In particular for present most use perimeter protection alarm detector of alarm system, better highlight abuses by severity and urgency to be solved.

Just imagine, in a large, medium, anti-theft alarm system, there are dozens or even hundreds of detectors, each probe needs to connect the cable to the control center's system controller or zone expansion modules, this will result in significant waste cables cost and construction labor cost of excessive consumption, while also directly increases the zone expansion modules of procurement costs, to the system of the scene debugging and post-maintenance increased difficulty and effort.

On the contrary, if the system can use bus type detector (that is, single-zone address module integrated in the detector), by bus-direct to each kind of detector and system controller, will be able to resolve the above mentioned various drawbacks.

System bus solutions

In the large business security system project, installation and maintenance simplicity is the key element of project selection, especially in the wiring, programming and follow-up of site maintenance, saving time and cost of capital.

Currently, foreign alarm manufacturer with the breakthrough of addressable bus detectors, significant savings in installation and maintenance costs, up to 128 bus detectors series in a 4-cell bus, no defense from the alarm control or add-on board wiring to each separately.

Controller itself can support up to 32 bus stand, plus the zone expansion modules to allow extensions to the system the maximum supported number of Defense area.

Contractors are free to choose, combined with a variety of connection methods, including bus system connection (Star joins, hand in hand to connect, or mixed-type connection), wire connections, or by bus connection to the wireless receiver and wireless detectors and other wireless terminal equipment for wireless communication.

Using the traditional way by wire connections, you need to match each detector directly connected to the controller, each probe only and switchboard connection between each other, they are independent of each other, this installation method is to increase the input cable, labor costs, and increased the wiring construction more difficult.

Bus installation is much simpler, it will need to install the bus type detector to connect to each other, so that each form a unity, at this point, as long as the continuum in a distraction from the controller connection cable can be bus detectors and controller collection into one system, construction, maintenance, all very convenient.

At present, the bus detectors generally include: four passive infrared detectors, sh detector, industrial-grade high-ceiling installation of detectors, industrial grade indoor sh and outdoor dual technology detectors, etc.

Interior bus detectors

Interior bus detectors and the other containing a wire, stand port is widely used in business, government agency and upscale residential premises.

Additional zone input ports, allowing connection to the bus near the door/window magnetic detector or any relay detector, saving both relay detectors connected to the controller cable costs. Connecting to additional zone port of a detector relay, controller can be assigned a separate zone number, it supports all manner of stand-terminal connection, including the normally closed or normally open, termination resistors, dual termination resistors and three termination resistors, etc. Using a proprietary Terminal wiring technology (dual termination resistors or three terminal resistor connection mode), occupies only a zone controller port will identify intrusion detector alarm, alarm and anti-removal alarm anti blocking, Aviso. The following describes the content-wire-bus installation and setup of analysis to install 8 detector + 8 door/window sensor, for example. Use Min wire installation mode, you need to pull from the controller 8 root data cables and power cord connected to eight detectors, also with 8 root data cable to connect the door/window sensor controller. The bus system probes connection system, as long as the door/window sensor pair connected to one bus detector additional zone port on each bus detector with a data bus, and then set the connection to the system controller. This installation method can greatly reduce the construction of wiring, installation difficulty saving construction and installation of cable, labor costs, and make the system more simple and later maintenance convenience.

Flexible bus connection

Bus detectors and system controller bus circuit is not subject to specific limitations, support bus, star or hybrid connection.

Based on this, can system bus loop on bus detectors on branch out more than one bus loop, as shown in Figure 1.

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