Communication bus system and station for use in such a communica

Details Communication bus system and station for use in such a communica Communication bus system and station for use in such a communica

1989-02-28

1992-07-07

Shaw, Gareth D.

Multiplex communications

Wide area network

Packet switching

370 941, 34082507, H04J 326

Patent

active

051289369

ABSTRACT:
A multi-station communication bus system allows for the use of several master stations by way of an arbitration organization. A message contains a master address which is subjected to an arbitration operation, a slave address with space for a slave address acknowledge bit, a control signal with space for a control acknowledge bit, and one or more data bytes. For each data byte an indication of the "last" byte is also transmitted and space is reserved for a data acknowledge bit. When a data acknowledge bit is not correctly received, the data byte in question is repeated until at the most the maximum frame length is reached. The remainder of a message is then placed in a next frame. If an address or control acknowledge bit is not correctly received, the relevant frame is terminated. In case of a plurality of bytes in a message, the first frame thereof has a lock control signal that is activated upon communication of at least one data byte. Moreover, the last byte of the message is put in a separate frame that has an unlock control signal which is activated upon communication of the last byte.

REFERENCES:
patent: 4429384 (1984-01-01), Kaplinsky
patent: 4715031 (1987-12-01), Crawford et al.
patent: 4750176 (1988-06-01), Van Veldhuizen
patent: 4779089 (1988-10-01), Theus
patent: 4818985 (1989-04-01), Ikeda

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