Serial bus communication method in a refrigeration system

Details Serial bus communication method in a refrigeration system Serial bus communication method in a refrigeration system

1993-01-27

1994-06-21

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 851, 370 99, 34082517, H04L 514

Patent

active

053233859

ABSTRACT:
A method of communication in a refrigeration system, between communication nodes connected to a serial data bus using Controller Area Network protocol (CAN) having a message frame format which includes a data field. The method includes converting a byte of the data field of each message frame to a permanent data descriptor expansion byte (DEB). In at least the first frame of a message a specific bit of the DEB is set to a first logic level to indicate a control frame, and information descriptive of the whole message is loaded into the remaining bits of the DEB, and data field. In each remaining frame of a message following a control frame, or control frames, the specific bit is set to a second logic level, to indicate a data frame. A block of data is loaded into the data field of each data frame, and index information specific to the associated block of data is loaded into the remaining bits of the DEB.

REFERENCES:
patent: 5050166 (1991-09-01), Cantoni et al.
John D. Spragins, "Telecommunications Protocol and Designs" 1991, pp. 323-327.
Intel "82526 Serial Communication Controller Architectural Overview", 1989, pp. 17-34.
Automotive Products Handbook 1990-Intel Corporation Literature Order No. 231792-004 pp. 7-1 through 7-45.

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