Error detection test device for a subscriber station of a serial bus system and method for testing mechanisms for detecting errors in a communication in a serial bus system

A subscriber station for a serial bus system, comprising:

• at least one error detection test device including:
• an evaluation module configured to evaluate which at least one bit in a signal must be interrupted so that receivers of a resulting signal in which the at least one bit is interrupted are able to check a function of a predefined error detection mechanism, the signal being processed by a protocol control unit while the subscriber station is in operation in order to be transmitted as a frame onto a bus of the bus system, or, after a frame has been received from the bus, to decode the signal from the received frame, and
• an output terminal configured to output a switching signal to the protocol control unit to interrupt the at least one bit evaluated by the evaluation module with regard to a signal output by the protocol control unit,
• wherein the evaluation module is configured to generate the switching signal based on the at least one bit evaluated by the evaluation module;
• a communications control device configured to control a communication of the subscriber station with at least one other subscriber station of the bus system, and the communications control device includes the protocol control unit which is configured to process the signal while the subscriber station is in operation in order to be transmitted as a frame onto a bus of the bus system, or, after a frame has been received from the bus, to decode the signal from the received frame;
• and
• a transceiver configured to transmit a transmit signal generated by the communications control device as a frame onto the bus and/or to receive a frame from the bus.

A bus system, comprising:

• a bus;
• and
• at least two subscriber stations which are connected via the bus in such a way that they are able to serially communicate with one another;
• wherein at least one of the subscriber stations includes:
• at least one error detection test device including:
• an evaluation module configured to evaluate which at least one bit in a signal must be interrupted so that receivers of a resulting signal in which the at least one bit is interrupted are able to check a function of a predefined error detection mechanism, the signal being processed by a protocol control unit while the subscriber station is in operation in order to be transmitted as a frame onto the bus, or, after a frame has been received from the bus, to decode the signal from the received frame, and
• an output terminal configured to output a switching signal to the protocol control unit to interrupt the at least one bit evaluated by the evaluation module with regard to a signal output by the protocol control unit,
• wherein the evaluation module is configured to generate the switching signal based on the at least one bit evaluated by the evaluation module;
• a communications control device configured to control a communication of the subscriber station with at least one other subscriber station of the bus system, and the communications control device includes the protocol control unit which is configured to process the signal while the subscriber station is in operation in order to be transmitted as a frame onto a bus of the bus system, or, after a frame has been received from the bus, to decode the signal from the received frame;
• and
• a transceiver configured to transmit a transmit signal generated by the communications control device as a frame onto the bus and/or to receive a frame from the bus.