Alarm system for protecting object, e.g. building, against unauthorized access has device(s) for checking sources of messages for alarm generator, resetting generator/inhibiting message forwarding

摘要

The system has a central unit (1) connected via a bus system (2) to an identification or focusing device(s) (3), a display device(s), an alarm generator(s) (5) and a signaling device(s). At least one monitoring device (7) receives defined messages for the alarm generator, carries out checks regarding their sources and, on detecting an unauthorized message source, causes resetting of the alarm generator and/or inhibits forwarding of the message.