Nuki Smartlock opening via potential free contact of other system

I would like to install Nuki smartlocks on two of my doors. Both have already a Keypad (Company is German - Hoermann). This keypad is, if code was entered correctly, allowing the safety module (which is inside the building) to open the door. Thereby the safety module it is just closing a potential free contact to energize the door opener. Can I use such a potential free contact to also give a signal to the NUKI in order to unbar the lock before energizing the door opener (or doing it in parallel).