When the access card of Smart Nanjing Community enters and exits the community, as long as the access card is placed on the card reader of the system, the door will automatically open and you can enter and exit at will. The entrance guard system of residential area consists of host, card reader and electronic lock. The community owner only needs to put the access card around the card reader, and the card reader can display the owner's identity information. If it is a residential resident, the access control system will automatically open the door.