Help Center -> Access Control System Management -> Door settings -> Anti-passback settings

## Door settings

### Anti-passback settings

Currently anti-passback settings support in and out anti-passback. In some special occasions, it is required that the card holder who entered from a door by card punching must exit from the same door by card punching, with the entry and exit records strictly consistent. One who followed another to enter the door without card punching will be denied when trying to exit by card punching, and one who followed another to exit without card punching will be denied when trying to enter by card punching. And when one who entered by card punching gives the card to another to try entering, the other person will be denied. The user can use this function just by enable it in the settings. This function is normally used in prisons, the army, national defense, scientific research, bank vaults, etc.
Add anti-passback settings:
1. Click [Access Control] - [Door configurations] - [Anti-passback settings] - [Add] to show anti-passback setting edit interface;
2. Select device (N-door control panel), because one device can only correspond to one anti-passback setting record, so when adding, devices with anti-passback settings cannot be seen in the dropdown list. When deleting established anti-passback information, the corresponding device will appear in the dropdown list. The settings vary with the number of doors controlled by the device:
Anti-passback can be set between readers and between doors. The card holder enter from door A, he must exit from door B, this function is used for channel or ticket management. .
Anti-passback settings of one-door control panel: Anti-passback between door readers ;
Anti-passback settings of a two-door control panel:
Anti-passback between readers of door 1, anti-passback between readers of door 2, anti-passback between doors 1/2 ;
Anti-passback settings of a four-door control panel :
Anti-passback of doors 1-2, anti-passback of doors 3-4, anti-passback of doors 1/2-3/4, anti-passback of doors 1-2/3, anti-passback of doors 1-2/3/4, Anti-passback between readers of door 1, anti-passback between readers of door 2, Anti-passback between readers of door 3, anti-passback between readers of door 4.
Note: The reader mentioned above includes Wiegand reader that connected with access control panel and inBIO reader. The single door and two door control panel with Wiegand reader include out reader and in reader. There is only in reader for four door control panel. The reader number of 1, 2 (that is RS485 address or device number, the same below) is for door 1, the reader number of 3, 4 is for door 2, etc. No need to consider if it is Wiegand reader or inBIO reader in setting of anti-passback between doors or between readers, just make sure the in or out state (means it is the in reader or out reader) and set according to the actual need. For the reader number, odd number is for in reader, and even number is for out reader.
3. Select anti-passback settings, and tick one item (anti-passback without repetition of doors or readers can be subject to multi-choice), click [OK] to complete setting, and the added anti-passback settings can be shown in the list.
Note: When editing, you can not modify the device, but can modify anti-passback settings. If anti-passback setting is not required for the device any more, the anti-passback setting record can be deleted. When deleting a device record, its anti-passback setting record, if exist, will be deleted.