System for alarm system arming and door lock operation

An alarm system, comprising:

• a door lock associated with a door of a building, the door lock arranged to automatically engage to lock the door in the closed position;
• and
• a base station configured and arranged to enter an armed state, the armed state being a state in which the base station indicates an alarm state in response to one or more of the following:
• detection of movement within the building, detection of opening of a window of the building, detection of opening of a door of the building, detection of sound within the building, detection of breakage of glass at the building, detection of fire in the building, detection of people in or around the building, and detection of a low temperature or water at the building;
• wherein in response to use of a specific code to gain access to the building when the base station is in the armed state, the base station is configured and arranged to enter a disarmed state to permit entry into the building, and in response to detected entry of a user into the building within a period of time after the specific code is used, the door lock and the base station are configured and arranged to respectively automatically engage to lock the associated door and automatically re-enter the armed state.