Fault tolerant output stage for digital two-conductor bus data communication system
First Claim
1. A fault tolerant output stage for a digital two-conductor bus data communication system comprising:
- a transmission module coupled to receive incoming serial data signals for conversion into bus signals for first and second bus lines, said transmission module being switchable between a difference mode and a single-wire mode of operation;
a state detection module connected to said first and second bus lines, which state detection module generates an output signal in the presence of a short-circuit between said first and second bus lines; and
a reception stage with an intermediate processing module having an input connected to said first and second bus lines for intermediate conditioning of said bus signals, and a reception module connected to an output of said intermediate processing module, for further conditioning the intermediately conditioned bus signals for transmission to a data processing unit connected to an output of said fault tolerant output stage;
whereinsaid transmission module switches between said difference mode and said single-wire mode in response to said output signal from said state detection module; and
intermediate processing module conditions said bus signals for output to the reception module automatically or in response to said output signal from said state detection module, both for fault free operation of said bus lines and in the presence of a single fault in operation of said bus lines, said single fault including one of an open circuit in one of said bus lines, a short-circuit of one said bus line to a fixed potential and a short-circuit between said bus lines.
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Abstract
The invention provides a fault tolerant output stage for a digital two-conductor bus data communication system of the type having a transmission module and a reception stage which contains a bus signal intermediate processing module and a reception module connected downstream that conditions incoming bus signals for a data processing unit which is connected downstream. A state detection module is connected to the bus lines to detect a short-circuit between the bus lines, in which case the transmission module can be switched over between a difference mode of operation and a single-wire mode of operation under the control of the state detection module. The intermediate processing module is configured to condition the bus signals for the reception module automatically or under the control of the state detection module, both in the case of fault free bus lines and in the case of an interruption or short-circuit to the high or low supply voltage of one of the two bus lines and in the case of a short-circuit of the two bus lines to one another.
38 Citations
6 Claims
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1. A fault tolerant output stage for a digital two-conductor bus data communication system comprising:
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a transmission module coupled to receive incoming serial data signals for conversion into bus signals for first and second bus lines, said transmission module being switchable between a difference mode and a single-wire mode of operation; a state detection module connected to said first and second bus lines, which state detection module generates an output signal in the presence of a short-circuit between said first and second bus lines; and a reception stage with an intermediate processing module having an input connected to said first and second bus lines for intermediate conditioning of said bus signals, and a reception module connected to an output of said intermediate processing module, for further conditioning the intermediately conditioned bus signals for transmission to a data processing unit connected to an output of said fault tolerant output stage;
whereinsaid transmission module switches between said difference mode and said single-wire mode in response to said output signal from said state detection module; and intermediate processing module conditions said bus signals for output to the reception module automatically or in response to said output signal from said state detection module, both for fault free operation of said bus lines and in the presence of a single fault in operation of said bus lines, said single fault including one of an open circuit in one of said bus lines, a short-circuit of one said bus line to a fixed potential and a short-circuit between said bus lines. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification