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?
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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