Two-dimensional code is also called two-dimensional bar code. The most common form is QR Code. QR is called Quick Response. It is a very popular encoding method on mobile devices in recent years. It can store more than traditional Bar Code. Information can also represent more data types.
Two-dimensional bar code/two-dimensional bar code (2-dimensional bar code) uses a certain geometric figure to record data symbol information in a black and white pattern distributed on a plane (two-dimensional direction) according to a certain rule; in the code preparation skillfully Using the concept of "0" and "1" bit streams that constitute the internal logic of the computer, several geometric shapes corresponding to the binary system are used to represent the text value information, and the information can be automatically read by image input devices or photoelectric scanning devices. Automatic processing: It has some common features of barcode technology: each code system has its specific character set; each character occupies a certain width; it has a certain check function, etc. At the same time, it also has the function of automatically identifying different lines of information, and processing graphics rotation change points.
The QR code access control system adopts a modular management method, which creates a good environment for the continuous upgrading of the access control system. Through the technical upgrade of the corresponding modules, new functions can be implanted without changing any hardware equipment.
For example: Recently, Lingling Kaimen successfully docked with the NFC function of Huawei mobile phones, realizing the "no card simulation" function. When a card is not needed, the user can directly virtual an access card from the mobile phone, and then the mobile phone can "touch it". One touch" opens the door.
Therefore, from now on, all the smart access control projects that Linglingkai cooperates with can have this function. For the access control systems that have been implemented, the NFC function can also be easily added through the smart management background.
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