Linkage between access control system and fire alarm system

In places with relatively dense traffic, it is difficult to evacuate people in emergencies such as fire alarms and terrorist attacks, especially after the installation of access control systems in these places, this problem is particularly obvious. It has become a major obstacle to people's escape. Therefore, the access control system must have the function of fire-fighting linkage.

The signal output by the fire alarm system is usually a passive dry contact signal, and the access control system can be linked with it in two ways.

Directly power off the electric lock controlled by the access control system

The fire protection system can be directly connected to the relay (it should be pointed out that when the relay has no fire alarm signal, the coil should be in a power-off state, so as to prolong the life of the relay) to control the electric lock power supply of the access control system, that is, the relay is normally open. The contact controls the on-off of the 220V power supply. When a fire alarm occurs, the relay will act in time to force the power-off control of the electric lock power supply of the access control system (mains power and backup power supply), so that the designated door can be automatically opened when the system is powered off. . The advantage of this method is that it is easy to use, but the controller has no access to alarm signals and no corresponding records are kept.

Access control system logical judgment linkage (indirect linkage)

The alarm signal of the fire alarm system is directly communicated with the linkage expansion port of the access control controller. This method can realize input functions including fire alarm signal input, glass breaker alarm signal input, etc., as well as sound and light alarm signal output, forced electric lock. Action output and other functions. In the event of a fire, the access control controller will accept the fire alarm signal transmitted by the fire alarm system in the form of a relay dry contact (the fire protection system actively sends the signal, and the access control system passively receives and executes control), so as to control the designation according to the prefabricated linkage command. The electric lock automatically opens or closes to facilitate the normal evacuation of personnel and achieve the purpose of escape.

In order to further emphasize the safety of the channel and prevent someone from deliberately creating false fire signals to automatically open the electric lock and cause escape accidents, the access control system can be set to the multi-channel fire alarm signal input authentication mode, which can be set to receive multi-channel fire alarm signals. A designated door is only opened when an alarm signal occurs. If only a single-channel alarm signal input is detected, no action command will be issued to the electric lock, but the electric lock can still be opened through the normal legal exit process.

Linkage between access control system and video surveillance system

Video surveillance is an important subsystem in the security system, and it is also a must-have security device for any large public place. The access control system can cooperate with the surveillance system camera, matrix or NVR to realize the image capture and monitoring function of the controlled access control point.

The linkage between the access control system and the video surveillance system can be realized in two ways:

The first is the hardware method. That is, the dry contact of the output relay of the access control system is used to the matrix alarm input module of the monitoring system and the alarm input end of the NVR, so as to realize the image capture and monitoring functions of the controlled door or related parts. This type of linkage is the most commonly used in the past, and it is also the most basic.

The second is the software method. The access control controller with the function of supporting digital video server (encoder) realizes the dual data exchange function from the device protocol layer to the software database layer at the same time with the digital monitoring system. There is also a software method, that is, directly write the access control management system software in the SDK of the video capture card in the NVR, and associate it with the NVR device through the access control software software function items. The above two software methods have their own advantages and disadvantages. The former has the advantage of fast system response and no delay. The disadvantage is that the video data must be stored in the local management host, which requires a higher capacity of the host's hard disk. The advantage of the latter is that the local management host does not need to save the video stream data, and only needs to call the data in the remote NVR when needed. The previous video is called.

The access control system linkage video surveillance can mainly realize the following three functions:

video recording

The access control system actions that can be associated with it include removal of the controller or sub-device, illegal door opening, door opening timeout, forced door opening, invalid card, card swiping to open the door, button door opening, disarming, arming, various other alarm conditions, etc. When the above signal is detected, the video surveillance equipment will be started immediately to record the events on the channel site, and the recording time can be set freely (generally including the video recording before, during and after the event), and the management host will record the events in real time. Reflect the recorded information on the access control software monitoring interface. According to the actual needs, the video recording data can be saved in the local management host or in the NVR in different places.

video capture

It is the same as the action that can be associated with video recording, the difference is that this function only captures the video of the event, and the captured image is the real-time information of the event.

Status monitoring

This function requires that the management host of the access control system must be turned on (the video surveillance system can be turned on or off according to the actual function of the access control product), and the real-time monitoring screen of the access control software is consistent with the screen at each channel. The operator can observe the status of the channel site synchronously through the monitoring screen, and its function is similar to the monitoring function of the NVR.

Access control system and intelligent building linkage

The linkage between the access control system and the intelligent building is mainly realized through the relay on the access control controller or the external relay of the system, that is, all the switching actions in the building management system are equivalently converted into the card swiping action in the access control system. The card swiping action is related to the relay or external relay action on the access control controller, so that the relay outputs the switch signal to control or manage various devices in the building system.

The linkage between the access control system and the building system is mainly reflected in the following three aspects:

Linkage with building intercom system

The linkage between the access control system and the intercom system is a parallel linkage. This linkage method is mainly to integrate the access control system into the building intercom door machine to realize the function of swiping the card to enter the door. The interconnection between the two is shown as pure hardware connection .

Moreover, there is basically no technical difficulty in this linkage. As long as there is reserved space in the intercom host to install the access control panel, the function of "intercom + access control" can be fully realized.

Elevator control linkage

The linkage control between the access control system and the elevator mainly realizes the following functions: making the public elevator become the owner's special elevator, enabling the user to swipe the card to use the elevator (need to press the floor number key), and the elevator arrives at the designated floor of the building after the user swipe the card (does not need to press the floor number key) ), reduce the misoperation and idling of the elevator, effectively reduce the loss, reduce the burden of elevator maintenance, and save maintenance costs. After registration, the administrator will issue a temporary access card or use the password set by the accused cardholder to make the elevator reach the designated floor. The essence of its function is to convert the switch input of the elevator button into the switch of the relay on the access control controller. For quantity input, the action of swiping the card replaces the action of pressing the button.

Intelligent energy management

Through the powerful external linkage function of the access control management system, the automatic energy management of the office environment can be realized. When going to work, the air conditioner and lighting equipment are automatically turned on by swiping the card; when off work, the air conditioner and lighting equipment are automatically turned off by the card swiping action to save energy; at night, the relevant operation of the access control system automatically turns on the building landscape lighting equipment; If necessary, it can also automatically control other electrical equipment in the office, which can be set arbitrarily for 24 hours, automatically cycle, and the time period is accurate to the minute.

The realization of this linkage method is mainly realized through the host computer management software, the internal relay of the controller or the external relay. The principle is also to use the switch output of the relay associated with the access control controller to control the AC contactor of the electrical equipment. Buttons or other means to control electrical equipment.

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