chrispeng [ad_1]
Nowadays, people’s demand for access control systems continues to increase, and applications are no longer limited to entrance and exit control, but also require multi-functional linkage integrated systems with anti-theft alarms, video surveillance, building automation, and fire alarms.
However, the reason why the access control system will go far is because it has the strong support of the three major technologies of identity verification, networking, and linkage integration.
Identity recognition and authentication technology
Remember that the password keyboard and magnetic card access control have a qualitative leap compared with the lock key, but the password is easy to be deciphered and the magnetic card storage space is small, easy to wear and copy, etc., which makes the security and reliability of the password keyboard and magnetic card access control suffer Restrictions. Later, contact cards appeared. Although they have made great progress (storage and processing capabilities) over passwords and magnetic cards, their insurmountable shortcomings (short wear life and inconvenient use) have eventually become their application development. Obstacles. At the same time, non-contact radio frequency cards have the advantages of no mechanical wear, long life, high safety, simple use, and difficult to be copied. Therefore, they have become a new army that has attracted much attention in the industry. From the perspective of identification technology, the use of RFID technology is the trend of contactless cards, and faster response speed and higher frequency are the future development trends.
In the 1980s and 1990s, the rapid development of computers and optical scanning technology made fingerprint extraction a reality. The introduction of image equipment and processing algorithms have provided conditions for fingerprint identification applications, and promoted the development and application of biometric access control systems. Studies have shown that fingerprints, palm prints, faces, retinas, iris, bones, etc. all have the characteristics of uniqueness and stability of individuals, and these characteristics generally will not change throughout the life, so these characteristics can be used as the basis for identifying a person’s identity. Thus produced the biometric technology based on these characteristics. Since the biological characteristics of the human body are reliable, unique, unchanging for life, no loss, and non-replicability, the biometric-based access control system has the highest safety and reliability in terms of identification.
At present, the access control systems researched and developed at home and abroad are mainly non-contact induction and biometric-based access control systems. Fingerprint identification is the most widely used in biometric access control. Whether it is inductive or biometric technology, their supporting technologies: radio frequency identification and biometric technology are now relatively mature.
Networking technology
The networking mode of the access control system is a very important factor to ensure the normal operation of the system. The industry generally believes that the dual networking mode can better ensure the stability and reliability of the access control system.
The other dual network is the dual network architecture of TCP/IP+RS485, which adopts the RS485 and TCP/IP hybrid networking mode, that is, each subnet adopts the RS485 bus method to form the network, and the communication between the subnets is based on the Ethernet Nets, which combine the strengths of the second-class nets to maximize their effectiveness. Generally speaking, this method refers to the use of TCP/IP networking between the PC and each access controller, and the RS485 connection between the lower-level controller and the card reader. On the whole, the upper TCP/IP, the lower RS485, and the second-level architecture are complementary architectures, which combine the advantages of the two architectures, enabling the access control system to not only deploy a wide range of points and high-speed information transmission, but also in the system security And the integration aspect also maintains high performance.
Integrated linkage technology
How does the access control system realize multi-system integration and linkage?
1. Integrated linkage based on the access control system, this method is mainly biased towards the management of access control entrances and exits.
After the alarm front-end transmits the alarm information back to the management center, it can be viewed in real time by calling the video image, and finally the access control system realizes the control of the scene. This kind of linkage mode, once an event occurs, the alarm event can be linked to the TV monitoring DVR and the video matrix to respond accordingly. For example, when a door is opened illegally, the system will control the matrix to switch the image to the TV wall and management platform, and start DVR recording at the same time. If the camera has a pan-tilt, it can also control the pan-tilt to rotate to a preset position.
2. Software integration of various subsystems. The integration of various subsystems requires not only the integration of the hardware, but also the integration of the software. Its integrability depends on the degree of agreement openness of various hardware devices, that is, whether these hardware devices Provide interface protocol. Only by providing (SDK or API function), the software can manage and control the hardware uniformly through the interface, and grasp the hardware working status. Of course, the software should also provide a linkage strategy and plan mechanism, and the software of the integrated system should also support hierarchical management.
However, the software is also required to be modularized, and each type of hardware uses a module to manage it. Just like the WINDOWS platform, no matter how the PC is configured, it can be installed and used, because different hardware has corresponding drivers for WINDOWS. Therefore, security integration should gradually realize platformization and modularization.
Concluding remarks
Of course, there are other important technologies in the access control system, such as the single-chip microcomputer technology in the controller, but the author believes that there is nothing more than the above three technologies as a whole.
With the increase in security requirements, single access control is far from being able to meet the security requirements. However, the increase in subsystems also means that the scale and complexity of the platform increase, or it may also weaken the overall capabilities. Therefore, only by rationally and scientifically integrating the various subsystems can the maximum effectiveness be achieved.
The so-called dual network has two meanings. One is to ensure the smooth communication of the dual-network structure of the same type of communication, such as dual RS485, dual TCP/IP interfaces, and the same type of dual interfaces complement and switch each other, thereby improving the stability and reliability of system communication.
[ad_2]
