Message routing in control area network (CAN) protocol

Details Message routing in control area network (CAN) protocol Message routing in control area network (CAN) protocol

1996-09-16

1998-12-29

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having computer control of elevator

34082552, 370229, B66B 128, H04Q 522, G01R 3108

Patent

active

058544542

ABSTRACT:
A hierarchial elevator control system (FIG. 2) utilizes standard Control Area Network (CAN) hardware and message protocols. A broadcast message format includes priority bits and source address bits in subfields within the standard CAN message identifier field, to separate priority levels from message type information, while maintaining collision avoidance by means of the source addresses. In a unicast message format, message response by individual receiving nodes is accomplished with simple standard CAN hardware filtering by providing, within the standard CAN message identifier field, a multi-bit destination address field to identify a unique receiving node to which the message is directed. In the unicast format, remote transmission requests are identified by a control bit in the standard CAN data field, and responded to utilizing a message-type field that is also in the data field portion of the message.

REFERENCES:
patent: 4497391 (1985-02-01), Mendelsohn et al.
patent: 4742893 (1988-05-01), Otala et al.
patent: 5387769 (1995-02-01), Kuperschmith et al.
patent: 5502818 (1996-03-01), Lamberg
patent: 5551053 (1996-08-01), Nadolski et al.
patent: 5654531 (1997-08-01), Farbee et al.
"CAN: Controller Area Network", 4 pages. http://www.docs.uu.se/.about.ken/CAN.html undated.
"The Basic CAN Protocol", 2 pages, Mar. 3, 1995 http://www.docs.uu.se/.about.ken/rt course/can
ode2.html.

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