What is the principle of two-dimensional code access control?

The two-dimensional code access control is a new product that has emerged in the past few years, and has been well developed and popularized in the last one or two years. Compared with the traditional access control, the two-dimensional code access control mainly increases the opening method of the two-dimensional code verification, and enhances the security. For the working principle of two-dimensional code access control, but not many people understand, this article will come with everyone to understand, the working principle of two-dimensional code access control.
Seberus QR code access control card reader
Read QR code
When the user scans the QR code, the QR code reader will read the relevant information of the QR code, and will use the hardware decoding method to interpret the QR code into a string type value. The interpreted value is Encrypted. After the data is interpreted, it will be transmitted to the access controller via Wiegand or RS232 or RS485 protocol.
Access controller decrypts data
After the data is transmitted to the access controller, since the data is still encrypted, the first step of the access controller is to decrypt the data. The decrypted data includes the user ID, area ID, QR code effective date, and customer self. Define the field. If the received data cannot be decrypted by the secret key, it is proved that the QR code is not generated by using the relevant program, and is an illegal two-dimensional code, so that the result is directly returned to the two-dimensional code card reader, and the card reader passes the indication. The lamp and the buzzer inform that it is an illegal card.
Online judgment and offline judgment
After the access controller decrypts the data, there will be two cases due to the setting. If the online judgment is set, the access controller will send the data to the access control server, and let the access controller determine whether the data is legal. If the offline judgment is set, the access controller will directly use the data in the built-in space to judge whether the data is legal.
process result
In the online judgment, the data is transmitted to the access control server, and the access control server will judge whether the data has the permission of the passage. After the judgment is completed, the result will be returned to the access controller, and the permission will open the access control and return the result to the two-dimensional code reading card. The two-dimensional code reader informs the legal card through the indicator light and the buzzer. If there is no permission, the access control is not opened, and the result is returned to the card reader, and the card reader informs the illegal card through the indicator light and the buzzer. The same is true for offline judgment. However, if the data is judged to be legal or illegal, it is handled by the access controller, and the processing result is the same as the online judgment.
QR code access control principle

Flaking Machine For Soybean Cotton Seed Oil Extraction


Introduction:
Flaking machine is mainly made up of two or more opposite rotating rolls (high nickel chrome molybdenum alloy), when fuel material (soybeans, peanuts, seeds, etc.) through two roll by the moment when the extrusion formation of embryo, and the first rolled out the oil, then leaching formed by refining finished cooking oil. Is a typical extrusion equipment.

Mill is a key equipment to vegetable oil processing enterprises pretreatment process, it is to rely on the clamping force between the two roller by granular material extrusion into thin slices of the technological process, the common problems of the previous production of the mill is the rigidity is not good, and roll back down without buffer device.I plant production mill work smoothly, the operation is simple, flexible and reliable performance, and is equipped with buffer device between roll, the roll for collision damage rate to a minimum extent.

Flaking Machine


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The complete sets of oil equipment that we manufactured, relying on many domestic scientific research institutions. Advanced technology, suitable for making all kinds of plant oil. From the raw material of cleaning up, prepressing, leaching, refining and the production processing of by-product (such as Phospholipids engineering, protein engineering), is totally a dragon design and production, has created considerable economic benefit and social benefit for the user and society more than 40 years. Company new development of biodiesel equipment technology in recent years, has put dozens of sets on the market, obtaining good economical benefits both In the domestic and overseas. At present, we have hundreds of successful installation operation of the oil equipment engineering experience, can design and product according to the difference of the user's economic condition. raw material regional, install oil equipments.

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Flaking Machine For Soybean Cotton Seed Oil Extraction

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