The entrance guard controller is a digital management system for managers to enter and leave. Common access control systems are: password access control system and contactless access control system. IC？ Card? (? Induction? IC？ Card? )? Access control system, fingerprint iris palm biometric access control system and so on. Password access control system has been faced with elimination due to weak security, poor convenience and biometric access control.
Principle of entrance guard controller
The card reader is used to read the smart card information (card number) of the card reader, and then convert it into an electrical signal and send it to the entrance guard controller. According to the received card number, the controller judges whether the cardholder is authorized to enter the gate within this time period through software, and completes the work of unlocking and keeping the lock according to the judgment result. For the networked access control system, the controller also receives the personnel information and corresponding authorization information sent by the management computer, and at the same time transmits the credit card record of entering and leaving the door to the computer. A controller can form a simple access control system to manage one or two doors. A plurality of controllers are connected with computers through communication networks to form the access control system of the whole building. The computer is equipped with the management software of the access control system, which analyzes and processes all the information in the management system.
Suggestions on the purchase of entrance guard controller
Suggestion 1: Buy an access controller with anti-collision and self-checking circuit design.
If the access controller collapses, it will cause users to be unable to open or close the door, which will bring great inconvenience to customers and increase the maintenance and cost of engineers. Access controller must be equipped with reset chip or CPU with reset function. 5 1 series CPUs generally do not have reset function, so reset chips need to be installed. At the same time, it must have self-checking function. If the circuit crashes due to interference or abnormal conditions, the system can self-check and start itself in an instant.
Suggestion 2: The entrance guard controller adopts three-level lightning protection circuit design.
Because the communication lines of the access controller are distributed, it is easy to be attacked by induced lightning, so the access controller must be designed for lightning protection. We suggest adopting three-level lightning protection design. First, the large current and high voltage generated by lightning strike are discharged through the discharge tube, then the current and voltage entering the circuit are clamped through the inductance and resistance circuit, and then the remaining current and voltage are discharged at high speed through the TVS high-speed discharge tube, so as to destroy the circuit. The lightning protection index requires that 4000V induction lightning will not damage the equipment for 50 consecutive times. The lightning protection index is high, and the surge resistance and antistatic ability of the equipment will be correspondingly high. Some products advertise that they also have the lightning protection capability of1500 V V. In fact, this indicator is that all chips have their own lightning protection and surge protection capabilities.
Recommendation 3: The storage capacity of the registration card authority should be large, and the storage capacity of offline recording should be large enough. The memory chip should be a non-volatile memory chip.
It is suggested that the authority of the registration card should reach 20,000, and it is best to store 6,543,800+records offline, which can meet the requirements of most customers for storage capacity and facilitate attendance statistics. Non-volatile memory chips such as Flash must be used, so that information will not be lost when power is cut off or impacted. If RAM+ battery mode is adopted, if the battery is dead or loose, or is impacted by current, information may be lost, and the disabled system may fail.
Recommendation 4: The communication circuit should be designed with self-checking function to meet the needs of large-scale system networking.
The networking of access controller usually adopts 485 industrial bus structure. Usually, many manufacturers choose max485/487 or 1487 chips to save costs. The load capacity of these chips is weak, usually the maximum load capacity is 32 devices, and the failure of one communication chip in the bus will affect the communication of the whole communication line, and it is impossible to find out which controller chip is damaged. We suggest using high-grade communication chips and integrated circuits similar to max3080, which have self-checking function. If the chip is damaged, the system will automatically disconnect, allowing the control devices on other buses to communicate normally.
Recommendation 5: The application program should be simple, practical and easy to operate.
If the control program is applied, it will undoubtedly increase the training cost and time for engineers to customers, and customers will be angry with the service attitude of engineers because it is not easy to master the operation of the software, which will have a bad influence on the collection and renewal of orders. Customers who don't understand the software are also prone to misoperation, causing practical inconvenience. Therefore, we suggest that engineers should pay attention to whether the operation of the software is simple, intuitive and convenient when choosing the access control controller, and unilaterally emphasize the powerful function, which is not suitable for popularization.
Mistakes in the purchase of entrance guard controller
Myth 1: It would be better to import an access controller.
The stability and maturity of imported controllers are very good. But the price is expensive, and due to regional differences, the timeliness of service will be poor and the service cost will be high. At the same time, due to cultural differences, foreign users have different needs and requirements for access control, and many functions are simply not suitable for the needs of domestic and domestic users. Of course, many domestic access control manufacturers have small production scale, weak design ability and few successful application cases, so engineers should choose carefully. In order to promote their own products, many domestic access control equipment manufacturers make deceptive sales under the guise of being made in Taiwan Province Province, the United States, Canada and other countries. In fact, the quality of their products has great problems, and engineers should be cautious about this phenomenon.
Myth 2: The wider the card reader compatibility, the better.
Some controllers claim to be compatible with various formats of card readers, such as 485 format, ABA format, wiegand37/40 format and so on. , but this is not necessary. Although these formats have certain advantages in some fields, they do not meet the international standards, which will bring trouble for future upgrading, expansion and anti-interference. We adhere to the principle that practicality, stability and compliance with standards are the best. We suggest that you only need a card reader that meets the international standard of wiegand26bit, and the imported access controller 90 meets this standard.
Myth 3: The more powerful the function, the better.
Many domestic controllers publicize how powerful their products are, and exaggerate the role of functions in access control. In fact, it is the most important for the stability, practical functions and simple operation of access control. We suggest that powerful extension functions should be shielded and provided only when customers need them to meet their needs. Don't recommend some functions that customers don't use, which can reduce the cost of training and maintenance and make customers use them satisfactorily.
Myth 4: The more expensive the better or the cheaper the better.
The product with good cost performance is the best product. Your product may be because the output is not high, or the advertising cost is too high, not necessarily because the product is of high value. Cheap products may also be that manufacturers unilaterally pursue low cost, reduce investment in protection circuits, or choose inferior second-hand chips, so engineers must keep their eyes open and make a reasonable evaluation of the cost performance of products.
Top ten brands of access control devices
First place: Siemens (China) Co., Ltd.
Second place: Shenzhen Dashi Intelligent Co., Ltd.
Third place: Shenzhen Song Ke Electronics Co., Ltd.
Fourth place: Israel dds Security Access Control Co., Ltd.
Fifth place: Shenzhen Mengjili Company
Sixth place: Ingersoll rand (China) Co., Ltd.
Seventh place: Shenzhen Jieshun Technology Industry Co., Ltd.
Eighth place: Shenzhen Open Technology Development Co., Ltd.
Ninth place: Hangzhou Cube Automation Engineering Co., Ltd..
Tenth place: Kong Zhong Science and Technology (China) Co., Ltd.
Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp； Wb, you can get it for free ~