Anti-passback method, apparatus and system

An anti-passback method, applicable to a first access controller communicatively connected to a server, comprising:

• detecting whether a first card reader attached to a door controlled by the first access controller successfully reads an identifier of an access card;
• if so, sending a door opening request to the server, wherein the door opening request contains an identifier of the access card, an identifier of the first card reader, and an identifier of the first access controller;
• receiving a door opening instruction sent by the server, wherein the door opening instruction is sent by the server when a route represented by an identifier of a second card reader, an identifier of a second access controller, the identifier of the first card reader, and the identifier of the first access controller exists in a preset list of routes preconfigured in the server;
• the identifier of the second card reader is an identifier of a card reader that reads the access card last time, which is found according to the identifier of the access card;
• and the second card reader is a card reader attached to a door controlled by the second access controller;
• and
• controlling a door corresponding to the door opening request to open, wherein after sending the door opening instruction to the first access controller, the server updates the identifier of the card reader that read the access card last time from the identifier of the second card reader to the identifier of the first card reader, and updates the identifier of the access controller corresponding to the card reader that read the access card last time from the identifier of the second access controller to the identifier of the first access controller.

An anti-passback system, comprising a server, at least two access controllers, and a card reader, wherein

• the card reader is configured for reading an identifier of an access card, and uploading the identifier of the access card and its own identifier to the access controllers;
• the access controllers are configured for:
• detecting whether a first card reader attached to a door controlled by a first access controller successfully reads an identifier of an access card;
• if so, sending a door opening request to the server, wherein the door opening request contains the identifier of the access card, an identifier of the first card reader, and an identifier of the first access controller;
• receiving a door opening instruction sent by the server, wherein the door opening instruction is sent by the server when a route represented by an identifier of a second card reader, an identifier of a second access controller, the identifier of the first card reader, and the identifier of the first access controller exists in a preset list of routes preconfigured in the server;
• the identifier of the second card reader is an identifier of a card reader that read the access card last time, which is found according to the identifier of the access card;
• and the second card reader is a card reader attached to a door controlled by the second access controller;
• and controlling a door corresponding to the door opening request to open;
• the server is configured for:
• receiving a door opening request sent by a first access controller, wherein the door opening request contains an identifier of an access card, the identifier of the first access controller, and an identifier of a first card reader reading the access card this time, the first card reader being attached to a door controlled by the first access controller;
• searching, based on the identifier of the access card, for an identifier of a second card reader that read the access card last time, and an identifier of a second access controller corresponding to the second card reader;
• determining a route for the door opening request, wherein, the route is represented by the identifier of the first card reader, the identifier of the first access controller, the identifier of the second card reader, and the identifier of the second access controller;
• determining whether the determined route exists in a preset list of routes preconfigured in the server;
• and if so, sending a door opening instruction to the first access controller to allow the first access controller to open a door corresponding to the door opening request according to the door opening instruction, wherein after sending the door opening instruction to the first access controller, the server is configured to:
• update the identifier of the card reader that read the access card last time from the identifier of the second card reader to the identifier of the first card reader, and update the identifier of the access controller corresponding to the card reader that read the access card last time from the identifier of the second access controller to the identifier of the first access controller.