Velleman HAA2866 - Manual (Page 40)

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An inter-lock system needs two door controllers. This application example uses two HAA2866 with
simple cross wire connection on their "Output 1 Inhibit" and "Inter-lock Control Output" terminals. It is
necessary to link up the "(-) GND" terminals of the two keypads as common ground to achieve the
inter-lock logical functions.
Use keypad to open the door from outside
Press egress button to open the door from inside
Connect the door magnetic sensors on the doors to monitor their positions
While door 1 is open, then, door 2 is forced to keep close, or vice versa
Use N.O. Relay output for fail-secure lock; and N.C. output for fail-safe lock
Please also see the "NOTE" stated in the Application Example (1)
3) BASIC WIRINGS OF AN INTER-LOCK SYSTEM USING TWO KEYPADS
DK-2862 DK-2862