Data communication system and electronic control unit used there

Details Data communication system and electronic control unit used there Data communication system and electronic control unit used there

1998-02-19

2000-12-26

Nguyen, Chau

Multiplex communications

Channel assignment techniques

Carrier sense multiple access

370470, 370522, H04L 12413, H04L 316, H04L 312

Patent

active

06167057&

ABSTRACT:
In a data communication system in which many nodes are connected to a common data bus so that each node can communicate with other nodes, a data frame to be transmitted from a node to other nodes includes a message having a variable length interposed between a signal indicating the length of the message and a signal indicating the end of the message in the frame. The message and the signals are coded according to a coding rule such as NRZ, and a bit stuffing rule is applied to the signal indicating the length of the message and the message while another rule violating the bit stuffing rule is applied to the signal indicating the end of the message. When the message length is changed due to noise or other causes in the course of data transmission, the signal indicating the end of the message is clearly detected at a receiving end because it is coded according to a rule different from the rule applied to the message and other signals. Further, since the length of the message actually received at the receiving end can be compared with the signal indicating the length of the message, transmission error can be detected without fail.

REFERENCES:
patent: 4715031 (1987-12-01), Crawford et al.
patent: 5001642 (1991-03-01), Botzenhardt et al.
patent: 5293571 (1994-03-01), Matsuda et al.
patent: 5499247 (1996-03-01), Matsuda et al.
patent: 5856976 (1999-01-01), Hirano

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