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Data communication system based on a serial bus and a monitor station for use with such system

  • US 5,448,554 A
  • Filed: 11/01/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 02/04/1991
  • Status: Expired due to Fees
First Claim
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1. A monitor station for use in a system which includes a single channel serial bus and a plurality of stations acting as transmitters and/or receivers, at least one of the plurality of stations being a master station and at least one of the plurality of stations being a slave station, the monitor station including a) clock means for timing bits or nibbles thereof;

  • b) means, responsive to the clock means, for downloading bits sourced from both the master station and the slave station, from the serial bus;

    c) means for recreating at least a portion of a frame structure present on the serial bus and for reorganizing the bits downloaded, by the downloading means, into a reconstituted frame,i) which reconstituted frame is the same as at least a portion of a frame transmitted on the serial bus,ii) which frame structureA) includes a start signal, address signals, further signals and control signals, andB) supports an in-frame dialog between the master and slave stations, in that it contains both read information from and write information for the master station,iii) which means for recreating includes a frame buffer for storing relevant parts of the reconstituted frame; and

    c) means for inspecting and monitoring any bit stored in the frame buffer;

    whereby the monitor stationcollects data from both the master station and the slave station;

    operates on a bit level;

    does not affect data on the serial bus.

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