If it is not illegal, it should be boycotted.

Basic definition of access control card. The original smart access control system consists of a host, a card reader and an electric lock (a computer and communication converter are added when networking). The card reading method is a non-contact card reading method. Hold the card Only when the reader quickly swings the card near the card reader (5-15 cm) can the card reader sense the presence of the card and lead the information in the card (card number) to the host. The host first checks the illegality of the card and then makes a decision. Whether to perform door closing action. All processes can realize access control management functions as long as they are within the valid card swiping range. The card reader is installed in the wall beside the door and does not affect other work. And through the communication adapter (RS485) and computer for real-time monitoring (all doors can be opened/closed by computer instructions, and the status of all doors can be viewed in real time), data processing, query, report input, etc.