Abstract: A system is disclosed for using passive infrared technology to analyze the thermal energy in a given space, to determine whether a person is present, and if so, whether he or she is experiencing an emergency or a normal physical state. A detector mounted on the wall or ceiling collects the thermal data. A microprocessor in a desk top control module or a personal computer determines occupant status from the data and instructs a wall-mounted indicator to activate occupant status signals. The preferred signals are: an intermittent red light and tone for emergencies, a green light for normal states, and an amber light for absences. Occupant status signals and silent alerts may be transmitted to and from other locations via a communications network. The invention also warns of possible fire danger. Additionally, it may be used to control lights and office machines and integrated with building security systems.

Abstract: A system is disclosed for indicating the status of a person relative to a workspace. A motion detector senses the entry and exit of the person through a entryway of the space and distinguishes the difference between the person's presence when moving and when stationary. An indicator automatically displays a constant green light to announce the person's presence, a flashing green light when the telephone is being used, a flashing amber light for short duration absences, a constant amber light for long duration absences and an intermittent red light and beeper for emergencies. A controller houses a preprogrammed microprocessor, a communications link and three illuminated buttons corresponding in color to the lights of the indicator and functioning in tandem with them. The green button activates the “Do not disturb” display, the amber button the long duration absence display and the red button the emergency alarm.

Abstract: A system is disclosed for indicating the status of a person occupying a cubicle, office or other enclosed space by means of automatically or manually initiated visual or audio-visual signals, particularly relating to the occupant's presence, the relative length of absences, the wish to work without being disturbed, and the need for emergency assistance. The system is controlled by a control unit with a micro-controller, a communications link, a red button, an amber button and a green button, each having a lamp of the corresponding color. A motion detector is connected to the control unit for detecting the presence or absence of motion in the monitored space. A proximity detector is connected to the control unit for detecting the passage of a person through the doorway of the monitored space. Also connected to the control unit is an indicator unit with a beeper and red, amber and green lamps functioning in tandem with the lamps of the control unit.