Imprint bolts are used in conjunction with magnetic contacts to monitor window locks.
Magnetic contacts only monitor the opening, and not the closing, of windows and French windows. A partially open window is identified as closed by the magnetic contact.
The terms have the following meanings:
Internally activated: The operator is present. Only the alarm devices allocated to the external device group (group 1) are activated. Internal group devices are not taken into account.
Externally activated: The operator is absent. All devices are activated.
External alarm devices are displays of an in-situ alarm status.
Essentially, alarms have two tasks: