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56 ProBio & ProFAC User Manual
16.4 Anti-passback Settings
To avoid some persons following users to enter the door without verification, resulting in security
problem, users can enable anti-passback function. The check-in record must match with check-out
record so as to open the door.
This function requires two devices to work together: one is installed inside the door (master device) and
the other one is installed outside the door (slave device). The two devices communicate via Wiegand
signal. The Wiegand format and Output type (User ID / Badge Number) adopted by the master device
and slave device must be consistent.
[Working principle]
The master device supports the Wiegand In function and the slave device supports the Wiegand Out
function. After the Wigand output port of the slave device is connected to the Wiegand input port of
the master device, Wiegand signals outputted by the slave device cannot contain the device ID and the
numbers sent from the slave device to the master device must exist on the master device. That is, the
user information on the slave device supporting the anti-passback function must map to the user
information on the master device supporting the anti-passback function.
[Function description]
The device detects anti-passback based on the last check-in/check-out record of users. The check-in
record must match the check-out record. The device supports out anti-passback, in anti-passback, and
in/out anti-passback.
Door
Slave Device
Master Device
User
Out
In