Combined name plate, bell pushes and door intercom, includes contacts and microcontroller, permitting programmed display, communication and control

摘要

An electronic display (20), system of contacts (30) and individual microcontroller (40) are included. The contacts are used to communicate with the microcontroller. The latter controls indications on the display. It also controls signals from the participants and/or signals from the unit and/or switching commands to the door unit.