Frame screening unit, user station for a serial bus system, and method for communicating in a serial bus system

A user station for a serial bus system, the user station comprising:

• a communication control device configured to transmit a message to a bus of the bus system and/or to receive the message from the bus of the bus system;
• a transceiver device configured to transmit the message on the bus and/or to receive messages from the bus;
• and
• a frame screening unit connected to the communication control device and to the transceiver device, the frame screening unit including:
• a screen block configured to generate a select signal that selects whether or not the communication control device of the user station is allowed to receive a reception signal that has been generated from a frame for the message that is serially received at that time from the bus;
• and
• a reception signal selection block configured to screen the reception signal as a function of the select signal generated by the screen block, in a manner that the reception signal is not transmitted to the communication control device of the user station, the transceiver device being configured to, regardless of a bit rate of the frame of the message, generate during the transmission a first bus state for a first digital data state of the messages, and a second bus state for the second digital data state of the messages, in such a way that the second bus state overwrites the first bus state.

A bus system comprising:

• a bus;
• at least one first user station including:
• a communication control device configured to transmit a message to a bus of the bus system and/or to receive the message from the bus of the bus system,
• a transceiver device configured to transmit the message on the bus and/or to receive messages from the bus, and
• a frame screening unit connected to the communication control device and to the transceiver device, the frame screening unit including:
• a screen block configured to generate a select signal that selects whether or not the communication control device of the user station is allowed to receive a reception signal that has been generated from a frame for the message that is serially received at that time from the bus, and
• a reception signal selection block configured to screen the reception signal as a function of the select signal generated by the screen block, in a manner that the reception signal is not transmitted to the communication control device of the user station,
• the transceiver device being configured to, regardless of a bit rate of the frame of the message, to generate during the transmission a first bus state for a first digital data state of the messages, and a second bus state for the second digital data state of the messages, in such a way that the second bus state overwrites the first bus state;
• and
• at least one second user station connected to the at least one first user station via a bus line for the bus in such a way that the at least one first user station and the at least one second user station communicates serially with one another, the data transmission standard of frames for messages of the at least one first user station differing, at least in part, from a data transmission standard of the at least one second user station.

A method for communicating in a serial bus system, the method comprising:

• transmitting, via a transceiver device, messages on a bus of the bus system and/or receiving, via the transceiver device, messages from the bus of the bus system;
• generating, via a screen block of a frame screening unit, a select signal that selects whether or not a communication control device of a user station of the bus system is allowed to receive a reception signal that has been generated from a frame for a message received serially from the bus at that time;
• and
• screening, via a reception signal selection block, the reception signal as a function of the select signal generated by the screen block, in a manner that the reception signal is not transmitted to the communication control device of the user station.