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

  • US 9,864,724 B2
  • Filed: 06/26/2012
  • Issued: 01/09/2018
  • 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 between the at least two bus subscribers via the bus, transmitted ones of the messages having a logical structure in accordance with the CAN standard ISO 11898-1;

    providing that when a first marker (EDL) is present in one of the transmitted messages, the control field of the one of the transmitted messages, divergently from the CAN standard ISO 11898-1, encompasses more than six bits, and when the first marker (EDL) is present in the one of the transmitted messages, providing that the data field of the one of the messages, divergently from the CAN standard ISO 11898-1, can encompass more than eight bytes, the values of the four bits of the data length code being interpreted at least in part divergently from the CAN standard ISO 11898-1 to establish the size of the data field; and

    providing, when a second marker (BRS) is present in the one of the transmitted messages, that the bit length for at least one predefined or predefinable region within the one of the transmitted messages assumes a value that is shortened with respect to the bit length used before the second marker was present, the region beginning at the earliest with the second marker and ending at the latest with the CRC delimiter, the second marker (BRS) occurring only when the first marker (EDL) is present, and occurring in the control field of the one of the transmitted messages which, divergently from the CAN standard ISO 11898-1, encompasses more than six bits.

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