ABB Welcome®— 4 —4 Operation4.1 Standard operation4.1.1 Control elementsFig. 1 Overview of the control buttons*For this option, please contact your electricalinstaller.No. Function1 HandsetFor incoming call, pick up handset within 30 seconds to answer the call.Hang up handset to end the call.2 4.3" touch screen.3 Unlock buttonPress this button to open the door at any time.If the LED flashes slowly, this indicates an incoming call.If the LED flashes rapidly, it indicates system is busy or the door has beenopened over the set time. (The sensor must be connected first.)4 Surveillance buttonIn standby mode, press this button to survey the default outdoor station.5 Programmable buttons 1, 2, 35A *Programmable buttons for additional functions, e.g. controlling theswitch actuator.5B Default function of button 1 is to release the lock connected with anoutdoor station (COM-NC-NO).6 System settings buttonEnter into the system settings for various functions of the device.