ZKTeco G4[QR], Инструкция по эксплуатации

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G4[QR] User Manual
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5.4 Anti-passback Setup
Anti-passback is a directional-control method used to control the misuse of an access control system.
This feature involves a specific sequence where the access control devices must be mounted both
inside and outside the door for access.
So, if any personnel enter an access-controlled area following another person without authenticating
on the biometric device, then the next time during his out-time, the door does not open when that
person attempts to leave the area. This function uses to detect whether the user's access is legal by
determining the user's last access record and the local control direction, which can effectively prevent
tailgating.
The Anti-passback setup can be divided into three types:
•
Anti-passback Out: After a user checks out, only if the last record is a check-in record, the
user can check-out again; otherwise, the alarm will be triggered. However, the user can
check-in freely.
• Anti-passback In:
After a user checks in, only if the last record is a check-out record, the user
can check-in again; otherwise, the alarm will be triggered. However, the user can check-out
freely.
• Anti-passback In/Out:
After a user checks in/out, only if the last record is a check-out
record, the user can check-in again; or if it is a check-in record, the user can check-out again;
otherwise, the alarm will be triggered.
Note : When the user has no record during the first verification, the anti-passback approval is passed
directly. This access direction depends on the selection of the control direction of the device,
corresponding to the state of the device.
•
The interface is shown below: