Multiplex communication system

Details Multiplex communication system Multiplex communication system

1991-02-27

1994-01-04

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

34082552, H04J 324

Patent

active

052766837

ABSTRACT:
Data having an ID code attached thereto is transferred via a network line. The ID code is detected by an ID code detection circuit and data is received by a data receiving circuit. An ID code detected by the ID code detection circuit and an ID code previously stored in an ID comparing register are compared with each other by a comparator circuit. Predetermined ID codes corresponding to an engine rotation speed and car speed, for example, are stored in the ID comparing register. A masking circuit for masking one or more bits of the ID code is provided in the comparator circuit. The switching state of a switch for controlling the transfer of data received by the data receiving circuit is controlled according to a comparison output of the comparator circuit. When the ID codes are coincident with each other, the switch is turned on, causing data received by the data receiving circuit to be transferred to a CPU. A plurality of electronic instruments can be selected by use of a single ID code by masking at least one bit of the ID code by means of a masking circuit.

REFERENCES:
patent: 4253179 (1981-02-01), Shimizu
patent: 4856091 (1989-08-01), Taska
patent: 4879715 (1989-11-01), Nakabayashi et al.
patent: 4916692 (1990-04-01), Clarke et al.
"Advances in Multiplexing in Automobiles" by Kiencke, Feb. 1990, Society of Automotive Engineers, Inc.

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