ZKTeco F18 User Manual page 53

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The choice of Machine models: Press ▲/▼ to switch the input box.
Press / to modify the setting. Select Anti-Out, refer to out anti-pass
back, only user's last record is in-record, the door can be open.
Otherwise it will trigger the alarm signal as illegal access. Select
"None", refer to no anti-pass back, and no alarm will be triggered. After
setting, press Menu directly to return to the last interface. Press "ESC"
to cancel setting and return to the last interface.
Anti-passback Function:
The master machine control OUT and the slave machine control IN.

In anti-passback (APB-In):
Only user's last record is out-record, can the door be opened. Otherwise
it will trigger the alarm signal as illegal access.
Enter: New user's first time access will pass.
In anti-passback mode not restrict of OUT.

Out anti-passback (APB-Out):
Only user's last record is in-record, the door can be opened. Otherwise it
here.
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