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QR code access control device and mobile phone are disconnected from the Internet, can I open the door?

March 05 , 2021

A netizen posted on Weibo, telling his embarrassing experience: the netizen was in a hurry to go to work and was about to be late in 5 minutes, rushed into the office building, hurriedly took out his mobile phone, and prepared to scan the code to enter the door. An embarrassing scene happened. Due to network problems, the QR code could not be loaded on the mobile phone. It didn't work for a long time. I could only ask the staff for help, and finally, I was 1 minute late.


Many people have encountered such experiences as netizens. But attentive friends may know that even if the flight mode is turned on, you can scan the code to enter the subway station, and then deduct the fee after connecting to the Internet. This shows that the disconnection of the mobile phone does not affect normal traffic at all.


Therefore, the QR code access control must have the ability to operate in a disconnected manner. How is this done?


How to achieve access when the mobile phone is disconnected


The solution to open the door is: After the mobile phone is disconnected from the Internet, you can use a small program or APP to enter the access control software. Through a special algorithm, the software will automatically generate an offline QR code. Compared with an online QR code, additional pseudo-code information will be added. The pseudo-code information corresponds to the device one-to-one. When the user uses the offline QR code read, the access control device will verify the pseudo-code information. If it is consistent with the device pseudo-code information, it is deemed to have the authority to open the door, otherwise, it has no authority.


When the pseudo-code information contains more pseudo-codes, the length of the pseudo-code information will be longer. It is reflected in the two-dimensional code picture that the picture is larger and denser, and the recognition rate will be slightly reduced by about 80ms. Subway station two-dimensional code access control The system also adopts this method.


Will devise disconnection affect the traffic?


Does not affect normal traffic. Because the user's permission information adopts a dual storage method, on the device side and the server side, under normal circumstances, the verification of the user's pass two-dimensional code is completed by the device side, not the server. The server is mainly responsible for permissions and device management.


When the device is disconnected from the network, the device and the server cannot communicate, and the pass records can be temporarily stored on the device side. The door opening QR code reader access control can store 20,000 log information. After the device is reconnected to the network, the log information will be uploaded to the server as soon as possible for permanent storage.


Why does the access control need to be networked?

QR code reader


Since the access control can be verified without connecting to the Internet, why is it necessary to connect to the Internet? The answer is: in order to install a brain for the access control system and make it smarter.


As the pioneer of the Internet + access control system, it makes opening doors easier for people to pass through. Through access control networking, it can achieve efficient management and control of 10,000 people and real-time detection of equipment status; through the collection and analysis of access big data information, it is a powerful building operation Reference: Through modular management, future evolution capabilities will be stronger, and it will be easier to upgrade the access control system; through the integration of the platform and peripheral systems, manual operation costs can be greatly reduced and management efficiency improved.


Two-dimensional code access control is now the mainstream of the industry, and the technology is very mature. Aiming at the smooth upgrade of old access control, Lingkai has proposed a targeted solution to complete the transformation at a low cost to make the access control system more intelligent and improve user experience.


Author: Written by S4A from S4A INDUSTRIAL CO.,LIMITED

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  S4A-Security For All.S4A Industrial Co., Limited, Founded in 2010, We have been dedicating in access control production R&D and sales for 10year till now. With the belief that we do one thing well in a lifetime, our CEO has been in this industry for 15 years. During the past 10 years, our products have been exported to various countries and regions. And 90% of customers come from the recommendations of cooperative customers, and 80% of the turnover comes from cooperative customers in the past 10years.Your business is a plant, we are the gardener, our mission is to water and fertilize the plant, and make it become the towering tree. We attach great importance to the partner's appeal, customer's suggestions, and feedbacks. To strengthen Product quality awareness, client's service awareness. Our clients and S4A are on the same path walking for many years.       S4A's future would be even more brilliant, this is related to all of our staff's working sweat. When you join this team, you will feel an invisible power to drive walk forward. S4A mainly produces a series of security Door Access Control such as:Network Access Controller, Locker board, Electromagnetic lock, Standalone door Controller, Automatic door opener, etcOur team can manufacture products, sell products, and do after-sales.In the realm of access control, one company stands out for its unwavering commitment to providing security services for everyone. S4A, which stands for "Security for All," has been at the forefront of access control technology for the past 13 years. With its own state-of-the-art factory and a strong focus on research and development, S4A has continuously delivered cutting-edge access control machines with the latest functions. Their dedication to product quality, customer feedback, practicability, and cost performance sets them apart as a leader in the industry.Factory and R&D Expertise:S4A takes pride in its fully-equipped factory, where skilled engineers and technicians work tirelessly to develop and manufacture access control solutions that meet the highest standards. The company's investment in research and development has resulted in a steady stream of innovative products that cater to evolving security needs.By staying ahead of the curve, S4A ensures that their customers have access to the latest advancements in access control technology.Quality Assurance and Customer Feedback:At S4A, product quality is of paramount importance. The company adheres to rigorous quality control procedures throughout the manufacturing process to guarantee the reliability and durability of their access control machines. Each product undergoes comprehensive testing to ensure it meets industry standards and exceeds customer expectations. S4A also places great value on customer feedback, actively seeking input to continuously improve their products and services. By listening to their customers, S4A maintains a customer-centric approach and delivers solutions that address real-world security challenges.Practicability and Cost Performance:S4A understands that access control solutions must not only be technologically advanced but also practical and cost-effective. The company's emphasis on practicability means that their products are designed to be user-friendly, easily integrated into existing systems, and adaptable to various environments. S4A's access control machines are known for their intuitive interfaces, simple installation processes, and seamless compatibility with other security systems. Additionally, S4A strives to provide cost-effective solutions without compromising on quality. Their competitive pricing ensures that security is accessible to businesses and individuals of all sizes.With 13 years of industry experience, S4A has cemented its position as a leading provider of access control solutions. Through their dedication to "Security for All," the company has set a benchmark for excellence in product quality, customer satisfaction,practicability, and cost performance. S4A's in-house factory and research and development capabilities enable them to stay at the forefront of technological advancements in the field of access control. As the company continues to evolve and innovate, S4A remains committed to empowering individuals and organizations with the highest level of security, ensuring that everyone can enjoy the peace of mind that comes with a reliable and efficient access control system.We can create value for you!Quality takes great importance for a company's credibility, and buyer's every penny spend must worth it. That is our most basic principle. Our business mainly for wholesale, so we could offer large quantities at competitive prices. During the past 10 years, We work hard to create value for our customers, and with our help, customers have an increasing market share. 99% of the customer...<
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