Patent ID: 7986220

Claim:
An automatic door system comprising: a bus; and a plurality of automatic door constituting units respectively connected to said bus so that said automatic door constituting units can communicate with each other via said bus; at least one of said plurality of automatic door constituting units being a door control unit for controlling opening and closing of a door, the other automatic door constituting units being ones selected from units constituting said automatic door system, including an indoor actuating sensor, an outdoor actuating sensor, an auxiliary sensor, an electric lock controller, a protocol transformer and a display unit; said door control unit being so arranged as to be able to call said other automatic door constituting units via said bus, said other automatic door constituting units being so arranged as to be able to respond to said calling; said door control unit judging that communication failure has occurred in any one of said other automatic door constituting units said door control unit has called, when that one of said other automatic door constituting units does not respond to said calling within a first predetermined time after said calling.