Serial bus communication method in a refrigeration system
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United States of America Patent
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Jun 21, 1994
Grant Date -
N/A
app pub date -
Jan 27, 1993
filing date -
Jan 27, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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