Anti-Passback prevents users from tailgating through controlled areas by tracking the entry and exit counts. A user can only exit an area that they have already entered and can only enter an area that they previously exited. If a user tailgates onto a site, the exit keypad will deny them exit from the site because they are not logged into the area. If a user is onsite and tailgates off of the site, they will be denied entrance next time they try to enter. Anti-Passback is a function that should only be used on High Security sites where users can be trained on its use.
It is recommendable to install the slave terminal outside the premises while the master terminal at the inside. The aforementioned installation is to prevent the master terminal from any unnecessary access and also prolong its life span. The slave terminal is a lot cheaper and easier to replace if any mishap occurs.
The slave terminal will be recording all the IN transactions (In terminal) while the master is capturing the OUT transactions (Out terminal). The master terminal will record all the transaction logs with the terminal ID, hence there will not be any confusion which transaction is taken from which terminal. The administrator can identify which terminal the user uses to verify and also gain access in to or out of the premises. Please refer to the table below before you apply the antipassback settings.
Written by Henry Pang