Method and device for serial data transmission having a flexible message size and a variable bit length
First Claim
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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Accused Products
Abstract
A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the transmitted messages having a logical structure according to CAN standard ISO 11898-1, the logical structure encompassing a start of frame bit, arbitration field, control field, data field, CRC field, acknowledge field, and end of frame sequence, the control field encompassing a data length code that contains an information item regarding the length of the data field. The method is characterized in that when a first marker (EDL) is present, the control field of the messages, divergently from ISO 11898-1, encompasses more than six bits; the first marker (EDL) being implemented by way of a recessive bit in the control field, and when the first marker is present, the recessive bit of the first marker (EDL) being followed, in all data messages, by at least one dominant bit.
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Citations
21 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An apparatus for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, comprising:
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an exchange arrangement to exchange 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; a control arrangement to provide, 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, to implement the first marker (EDL) by a recessive bit in the control field, and to provide 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. - View Dependent Claims (15, 16, 17, 18, 19)
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20. A method for serial data transfer, during normal operation of a motor vehicle to transfer data between at least two control units of the motor vehicle that are connected via a data bus in a bus system having at least two bus subscribers that exchange messages via the bus, the method comprising:
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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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21. A method for serial data transfer, during production or maintenance of a motor vehicle to transfer data between a programming unit connected to a suitable data bus for programming purposes and at least one control unit of the motor vehicle which is connected to the data bus in a bus system having at least two bus subscribers that exchange messages via the bus, the method comprising:
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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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Specification