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Method and device for serial data transmission having a flexible message size and a variable bit length

  • US 9,852,106 B2
  • Filed: 06/26/2012
  • Issued: 12/26/2017
  • Est. Priority Date: 06/29/2011
  • Status: Active Grant
First Claim
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1. A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the method comprising:

  • exchanging messages via the bus, transmitted ones of the messages having a logical structure in accordance with the CAN standard ISO 11898-1, the logical structure encompassing a start of frame bit, an arbitration field, a control field, a data field, a CRC field, an acknowledge field, and an end of frame sequence, the control field encompassing a data length code that contains an information item regarding the length of the data field;

    providing, when a first marker (EDL) is present, that the control field of the messages, divergently from the CAN standard ISO 11898-1, encompasses more than six bits;

    implementing the first marker (EDL) by a recessive bit in the control field; and

    providing that, when the first marker is present, the recessive bit of the first marker (EDL) is followed, in all data messages, by at least one dominant bit.

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