Bus system and method for exchanging data
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Abstract
The invention relates to a bus system comprising at least two bus lines (11; 12) whereon a differential level is applied, said level being dominant or recessive. The bus system also comprises at least two transceivers (22) for bidirectional communication in semi-duplex operation which are connected to the bus lines (11; 12) and which transform the differential levels of the bus lines into a digital level, in addition to at least one hardware-interface (231) which is connected to one of the two transceivers (22) for asynchronous, bidirectional communication in full-duplex operation. A CAN bus can be used for storing data or for carrying out a diagnosis without the need for recalling the CAN-protocol.
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Citations
27 Claims
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1-13. -13. (canceled)
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14. A bus system, comprising:
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two bus lines for conducting a differential level, wherein said differential level selectively assumes one of a dominant state and a recessive state;
at least two transceivers connected to said two bus lines for bi-directional communication with said two bus lines in half duplex mode, each of said at least two transceivers converting the differential level on said two buses into a digital level; and
a hardware interface connected to one of said at least two transceivers, said hardware interface being capable of asynchronous, bi-directional communication in full duplex mode. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22)
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23. A method for interchanging data on a bus system, wherein the bus system includes two bus lines for conducting a differential level, wherein the differential level selectively assumes one of a dominant state and a recessive state, at least two transceivers connected to the two bus lines for bi-directional communication in half duplex mode, each of the at least two transceivers converting the differential level on the two buses into a digital level, and a microcontroller having first and second hardware interfaces, the first and second hardware interfaces being connected to the same one of the at least two transceivers, the first hardware interface being capable of asynchronous, bi-directional communication in full duplex mode, said method comprising the steps of:
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activating one of the first and second hardware interfaces and disabling the other of the first and second hardware interfaces when the bus system is first started; and
disabling the one of the first and second hardware interfaces and activating the other of the first and second hardware interfaces if no signals from the one of the first and second hardware interfaces are recognized within a period of time. - View Dependent Claims (24, 25, 26, 27)
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Specification