Communications: electrical – Continuously variable indicating – With meter reading
Patent
1994-12-27
1995-11-21
Black, Thomas G.
Communications: electrical
Continuously variable indicating
With meter reading
370 851, 34087001, G08C 1916, G05B 2302, H04J 314
Patent
active
054691508
ABSTRACT:
A four-wire bus is provided with a two-wire power bus and a two-wire signal bus and a plurality of sensors and actuators attached to both two-wire busses. A modification is provided to the standard CAN protocol developed and provided by Robert Bosch GmbH, in which the standard CAN header, of a data packet is modified to incorporate a shortened device identifier priority. By shortening the identifier field of the CAN header three bits are made available for use as a short form protocol data unit which can be used to contain binary information representing both the change of status of an identified device and the current status of the device. The same three-bit PDU can be used to acknowledge receipt of the change of status information. In order to retain all of the beneficial capabilities of the standard CAN protocol, the three-bit short form PDU can also be used to identify the use of additional bytes of a data field so that a device can take advantage of the more complex capabilities of the standard CAN protocol. However, in situations where a mere change of status report is sufficient, the present invention reduces the length of a message from a minimum of three bytes to a length of two bytes to obtain the significant benefits of increased speed of message transmission.
REFERENCES:
patent: 4374333 (1983-02-01), Avery
patent: 4677308 (1987-06-01), Wroblewski et al.
patent: 4791311 (1988-12-01), Vig
patent: 5163048 (1992-11-01), Heutink
patent: 5200743 (1993-04-01), St. Martin et al.
patent: 5323385 (1994-06-01), Jurewicz et al.
"Logging on Nets", Electrical/Electronic Engineering and Technology Guide, (one page) machine Design Magazine, Jan. 1993.
Black Thomas G.
Honeywell Inc.
Jung David Tiuk
Lanyi William D.
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