Anti-passback
User can establish an anti-passback group by adding multi-readers in a controller system. When a user presents card on a reader for two times, the door will open only in the first time. If user presents card on the two readers alternatively (in an anti-passback group), the can door will open every time.

Please note: One reader belongs to only one anti-passback group. If user selects "Yes" here, the reader will be deleted from original anti-passback group. If there is only one reader in an anti-passback group, the door may not be opened.

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