The figure shows one Anti-passback area with three border devices D1, D2 and D3. The only devices that can set the Anti-passback function are border devices. Device D4 inside the Anti-passback area is not used for area entry/exit control. Both the entry and exit directions are set for devices D2 and D3.

Device D1 is only used for entry to the Anti-passback area. The device is set as an entry device.

Device D2 is used both for entry and exit. The device has an extending module for entry and the set main unit for exit.

Device D3 is used both for entry and exit. The device has the set main unit for entry and an extending module for exit.