Transmission module for a transmitting/receiving device of a subscriber station of a serial bus system, and method for transmitting a message with differential signals in a serial bus system

A transmitting/receiving device, comprising:

• a transmission module configured to transmit a digital transmit signal as an analog differential signal on a bus of a serial bus system in order to transmit a message to at least one other subscriber station of the bus system, wherein bits of the digital transmit signal have a greater bit duration in a first communication phase than in a second communication phase of the transmit signal,
• wherein the transmission module is configured to generate states, specified by the digital transmit signal over time, on the bus by changing bus voltage and/or bus impedance,
• wherein the transmission module is configured to change the specified states on the bus via a predetermined sequence of intermediate states for the bus voltage and/or for the bus impedance toward a desired state on the bus, and
• wherein the transmission module is configured to, when signaling changes during a transition between two of the specified states on the bus, change the transition back again continuously with an opposite sequence of intermediate states from the intermediate state reached by then;
• and
• a reception module configured to receive signals from the bus and to generate a digital receive signal from the analog differential signal.

A subscriber station for a serial bus system, comprising:

• a transmitting/receiving device including:
• a transmission module configured to transmit a digital transmit signal as an analog differential signal on a bus of a serial bus system in order to transmit a message to at least one other subscriber station of the bus system, wherein bits of the digital transmit signal have a greater bit duration in a first communication phase than in a second communication phase of the transmit signal,
• wherein the transmission module is configured to generate states, specified by the digital transmit signal over time, on the bus by changing bus voltage and/or bus impedance,
• wherein the transmission module is configured to change the specified states on the bus via a predetermined sequence of intermediate states for the bus voltage and/or for the bus impedance toward a desired state on the bus, and
• wherein the transmission module is configured to, when signaling changes during a transition between two of the specified states on the bus, change the transition back again continuously with an opposite sequence of intermediate states from the intermediate state reached by then, and
• a reception module configured to receive signals from the bus and to generate a digital receive signal from the analog differential signal;
• and
• a communication control device configured to control communication in the bus system and to generating the digital transmit signal;
• wherein the subscriber station is configured for the communication in a bus system in which exclusive, collision-free access of a subscriber station to the bus of the bus system is ensured at least temporarily.