Lock input device for a security system

A security system for monitoring at least one door, the door being movably disposed within a frame, the security system comprising:

• a lock adjustable between a first configuration at which the lock secures the door within the frame and a second configuration at which the door is displaceable with respect to the frame;
• a lock sensor configured to generate a signal when the lock adjusts from the first configuration to the second configuration;
• a door sensor configured to generate a signal when the door displaces with respect to the frame;
• an alarm device configured to provide an alarm;
• and
• a control coupleable with the lock sensor and with the door sensor, switchable between an armed mode and a disarmed mode, and configured to operate in the armed mode such that the control activates the alarm device when the control receives the door sensor signal prior to a receipt of the lock sensor signal and alternatively switches to the disarmed mode when the control receives the lock sensor signal prior to a receipt of the door sensor signal.