The XT lockswitch contact is installed in your doorframe. Thus, the contact is triggered when the door is locked or unlocked.
In the automation menu of the XT2 you to create rules that will arm or disarm your alarm panel, switch lights and standby devices on or off, and create various other automatisations. In combination with the XT1, the lockswitch contact only displays the condition of your door (locked or unlocked). The lockswitch contact is connected with a small cable with our sensor input.
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