Communication control device and transceiver for a user station of a serial bus system, and method for communicating in a serial bus system

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

• a transceiver module configured to transmit a transmission signal onto a bus of the bus system, in which bus system at least one first communication phase and one second communication phase are used for exchanging messages between user stations of the bus system, and to generate a digital reception signal from a signal that is received from the bus;
• a first terminal configured to receive the transmission signal from a communication control device;
• a second terminal for transmitting the digital reception signal to the communication control device;
• a bidirectional terminal;
• and
• an operating mode switching module configured to switch a transmission direction of the bidirectional terminal as a function of an operating mode of the transceiver in the second communication phase, in order to carry out a differential signal transmission of the transmission signal in the second communication phase via the first terminal and the bidirectional terminal, or to carry out a differential signal transmission of the digital reception signal in the second communication phase via the second terminal and the bidirectional terminal.

A bus system, comprising:

• a bus;
• and
• at least two user stations that are connected to one another via the bus in such a way that they may communicate serially with one another, and of which at least one user station includes:
• a communication control device including:
• a communication control module configured to generate a transmission signal for controlling a communication of the user station with at least one other user station of the bus system, in which bus system at least one first communication phase and one second communication phase are used for exchanging messages between user stations of the bus system;
• a first terminal configured to transmit the transmission signal to a transceiver that configured to transmit the transmission signal onto a bus of the bus system,
• a second terminal configured to receive a digital reception signal from the transceiver,
• a bidirectional terminal, and
• an operating mode switching module configured to switch a transmission direction of the bidirectional terminal as a function of an operating mode of the transceiver in the second communication phase, in order to carry out a differential signal transmission of the transmission signal in the second communication phase via the first terminal and the bidirectional terminal, or to carry out a differential signal transmission of the digital reception signal in the second communication phase via the second terminal and the bidirectional terminal;
• and
• a transceiver including:
• a transceiver module configured to transmit the transmission signal onto a bus of the bus system, and to generate a digital reception signal from a signal that is received from the bus,
• a third terminal configured to receive the transmission signal from the communication control device,
• a fourth terminal for transmitting the digital reception signal to the communication control device,
• a second bidirectional terminal, and
• an second operating mode switching module configured to switch a transmission direction of the second bidirectional terminal as a function of the operating mode of the transceiver in the second communication phase, in order to carry out the differential signal transmission of the transmission signal in the second communication phase via the third terminal and the second bidirectional terminal, or to carry out the differential signal transmission of the digital reception signal in the second communication phase via the fourth terminal and the second bidirectional terminal.

A method for communicating in a serial bus system, the method being carried out using a user station for a bus system in which at least one first communication phase and one second communication phase are used for exchanging messages between user stations of the bus system, the user station including a communication control device and a transceiver, the method comprising the following steps:

• switching, via an operating mode switching module of the communication control device, a transmission direction of a bidirectional terminal of the communication control device as a function of an operating mode of the transceiver in the second communication phase;
• switching, via an operating mode switching module of the transceiver, the transmission direction of a bidirectional terminal of the transceiver as a function of the operating mode of the transceiver in the second communication phase;
• and
• carrying out a differential signal transmission between the communication control device and the transceiver in the second communication phase, the differential signal transmission being carried out as a function of the operating mode of the transceiver in the second communication phase, either via a first terminal and a bidirectional terminal of each of the communication control device and the transceiver, or via a second terminal and the bidirectional terminal of each of the communication control device and the transceiver.