Does every room card have a card number?

Each room card has a fixed number, also called serial number or card number. The front desk will enter the room card information into the system when issuing the room card. When the door lock reads the room card, it will first read the card number and then convert it into an electrical signal and send it to the controller. The controller will compare the received information with the system to judge whether the room card is legal, and complete the work of unlocking and keeping the lock according to the judgment result.