Local area network between an elevator system building controlle

Details Local area network between an elevator system building controlle Local area network between an elevator system building controlle

1993-06-01

1995-02-07

Stephan, Steven L.

Elevator, industrial lift truck, or stationary lift for vehicle

Having computer control of elevator

Includes redundant circuitry

3701001, G09F 2703, G06F 1116

Patent

active

053877691

ABSTRACT:
A LAN elevator network includes (a) a pair of redundant car buses for exchanging signals with car control system elements, (b) a pair of redundant group buses for exchanging signals with the redundant car buses through a car-group bridge, and (c) a pair of redundant building buses, which exchange messages with a building controller, through a group-building bridge. Communication among all nodes on the car bus, group bus, and building bus occurs using a single protocol. Each communications element on a bus communicates with the bus using a communications coprocessor including a transmitter and a receiver.

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patent: 4742893 (1988-05-01), Otala et al.
patent: 4765442 (1988-08-01), Blain et al.
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patent: 5001755 (1991-03-01), Skret
patent: 5202540 (1993-04-01), Auer et al.
patent: 5210750 (1993-05-01), Nassehi et al.

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