Transceiver device for a subscriber station of a serial bus system, and method for a communication using differential signals in a serial bus system

Abstract

The invention relates to a transceiver device (12) for a subscriber station (10; 30; 50) of a serial bus system and to a method for a communication using differential signals in a serial bus system. The transceiver device has a first connection (TXD / TX) for receiving a transmission signal (TxD; Tx) from a communication control device (11; 11A), a transmitting module for transmitting the digital transmission signal as an analog differential signal to a bus of the bus system in order to transmit a message to at least one other subscriber station (10; 20; 30; 50) of the bus system, a receiving module (122; 1220) for receiving signals from the bus and for generating a digital received signal from the analog differential signal, a second connection (RXD / RX) for outputting the digital received signal to the communication control device, and a COM-IF detection module for evaluating the digital received signal with respect to a communication standard of two communication standards (CAN; 10BASE-T1S) for which the transmitting module and the receiving module are designed for communication in the serial bus system. The receiving module has a first comparator (122A) for evaluating the signals from the bus using a first reception threshold, a second comparator (122B) for evaluating the signals from the bus using a second reception threshold, the voltage value of which differs from the voltage value of the first reception threshold, and a reception threshold control block (1221) for controlling the voltage value of the first reception threshold and the voltage value of the second reception threshold on the basis of the evaluation carried out by the COM-IF detection module in order to set the receiving module to receive the signals from the bus and to generate the digital received signal according to the communication standard of the two communication standards according to which the transmission signal was generated.

Description

[0001] Description

[0002] Transmitting / receiving device for a subscriber station of a serial bus system and method for communication with differential signals in a serial bus system 0

[0003] The present invention relates to a transmit / receive device for a subscriber station of a serial bus system and a method for communication with differential signals in a serial bus system. 5 Prior Art

[0004] Serial bus systems have a bus to which participant stations are connected via a transceiver to communicate with each other over the bus. The transceiver is also called transceiver 0. During communication, data is exchanged between the

[0005] Participating devices, such as sensors, control units in a vehicle or a technical production plant, etc., are exchanged. Various standards or data transmission protocols exist for data transmission in serial bus systems. Well-known serial bus systems with differential signals include CAN XL, 10BASE-T1 S-Ethernet, FlexRay, and LVDS.

[0006] (LVDS = Low Voltage Differential Signaling) and so on.

[0007] Each of these serial bus systems uses differential signals with different signal states, which serially signal the data to be exchanged as 0.

[0008] It is possible that one part of the technical system uses a bus system that employs a different communication standard than a bus system used in another part of the technical system. For example, a CAN bus system is to be used for communication in a vehicle's emergency braking system, whereas a 10BASE-T1 S-bus system is to be used for communication in a windshield wiper system.

[0009] The problem is that communication in the CAN bus system and the

[0010] 5. Communication within the 10BASE-T1 S-Bus system is not compatible with each other. For example, if at least one control unit needs to be replaced due to a defect, a control unit that supports the communication standard in the bus system to which the replaced control unit was connected is not always available in time. 0

[0011] Furthermore, data from some of the vehicle's devices, such as a rain sensor or a warning signal generator, etc., are required for parts of the technical system that communicate using different communication standards. 5

[0012] To solve this problem, two devices, in particular two rain sensors and / or warning signal generators, etc., could be used, one of which is connected to the CAN bus system and the other to the 10BASE-T1 S-bus system.

[0013] Alternatively, such a device may have communication devices designed for communication in the CAN bus system and communication devices designed for communication in the 10BASE-T1 S-bus system. 5

[0014] However, this requires significantly more equipment than a system that uses only one communication standard. Consequently, the system requires more space and is considerably more expensive to manufacture and maintain.

[0015] DE 10 2021 207 186 A1 describes a transmitter / receiver device that includes a special circuit for comparators for evaluating signals in a CAN bus system. 5 Disclosure of the Invention Therefore, it is an object of the present invention to provide a transmitter / receiver device for a subscriber station of a serial bus system and a method for communication with differential signals in a serial

[0016] 5. To provide a bus system that solves the aforementioned problems.

[0017] In particular, a transmit / receive device for a subscriber station of a serial bus system and a method for communication with differential signals in a serial bus system are to be provided, which solve the compatibility problem between different communication standards in a technical plant.

[0018] The problem is solved by a transmit / receive device for a subscriber station of a serial bus system with the features of claim 1. The transmit / receive device has a first connection for receiving a transmit signal from a communication control device, a

[0019] A transmitter module for sending the digital transmit signal as an analog differential signal to a bus of the bus system in order to send a message to at least one other subscriber station of the bus system, a receiver module for receiving signals from the bus and for generating a digital receive signal from the analog differential signal, a second connection for outputting the digital receive signal to the communication control unit, and a COM-IF acquisition module for evaluating the digital transmit signal with respect to one of two communication standards, for which the transmitter module and the receiver module are used for communication in the serial

[0020] The bus system is designed, wherein the receiver module has a first comparator for evaluating the signals from the bus with a first reception threshold, a second comparator for evaluating the signals from the bus with a second reception threshold whose voltage value differs from 0 and a voltage value of the first reception threshold, and a

[0021] Receive threshold control block for controlling the voltage value of the first receive threshold and the voltage value of the second receive threshold based on the evaluation of the COM-IF acquisition module, in order to set the receive module to receive the signals from the bus and to generate 5 the digital receive signal according to the communication standard of the two communication standards with which the transmit signal was generated.

[0022] The described transmitting / receiving device has a receiving module with a

[0023] The receiver module features an optimized number of comparators and corresponding output logic, which can be configured to meet the different requirements of at least two different communication standards or specifications. Depending on the communication interface used, in particular CAN-XL or 10BASE-T1 S, the receiver module can automatically adjust the switching thresholds of the comparators and the output logic to ensure that the requirements of the selected standard are met in accordance with the specifications.

[0024] The transmit / receive device is a combined transceiver that not only meets all five requirements of the CAN-XL and 10BASE-T1 S standards with regard to switching and receiving thresholds, but also fulfills timing and other requirements with minimal overhead in terms of design effort, area, and power consumption compared to separate designs. Furthermore, the described transmit / receive device can be equipped with a special

[0025] The module detects at the connection for a digital transmit signal whether the combined transceiver should behave according to the 10BASE-T1 S standard or the CAN-XL standard, without requiring an additional connection or non-standard inputs from the communication control unit, especially its controller. The module is designed to recognize the patterns sent by the connected communication control unit at the digital transmit signal connection for communication within the bus system.

[0026] Thus, the described transmitter / receiver can independently detect which communication standard a connected communication control unit uses. This allows for a very high degree of flexibility in selecting the communication standard for the bus system and therefore the communication control unit, provided the described transmitter / receiver is connected to the bus in its original configuration.

[0027] An additional advantage is that electrical circuit components, such as the electrical

[0028] 5. Power supply, etc., of the described transceiver can be used for two different communication standards. As a result, the described transceiver can save semiconductor area. This optimizes the space requirements of the transceiver and the bus system. Consequently, the described transceiver is extremely resource-efficient and cost-effective.

[0029] Due to the design of the described transceiver, the effort required to adapt the communication control unit to the transceiver is very low. Only the wiring of the 5 connections (pins) for the bus lines needs to be adapted to the existing system.

[0030] adapt the communication control unit.

[0031] Furthermore, due to the design of the described transmitting / receiving device, reliable communication with a very low error rate is enabled for at least two different differential bus systems in an uncomplicated and cost-effective manner.

[0032] The described transmitting / receiving device makes it possible to change the communication standard for an existing wiring setup of 5 transmitting / receiving devices in a comparatively straightforward manner.

[0033] The reason for this is that the described transmitter / receiver can be used with minimal configuration effort for bus systems on which communication takes place using different communication standards. If necessary, an existing device in a technical system, especially a vehicle, can thus be flexibly connected to different bus systems on which communication takes place using different communication standards, as required.

[0034] The described transmit / receive device is designed in particular to be configured as a CAN SIC transmit / receive device and / or CAN XL transmit / receive device and / or 10BASE-T1 S transmit / receive device, depending on the connected communication control device.

[0035] Overall, the described transmitting / receiving device cannot therefore

[0036] 5. It not only enables communication within the bus system between other participating stations at the (high) bit rates required for the respective communication standard, but is also designed in such a way that the transmissible bit rate is not reduced by errors in the communication. The described transmit / receive device can be used in particular for gateway-

[0037] Products are used. Such gateway products typically include a power supply unit and several interfaces. For example, a voltage supply U_bat is regulated to 5V to operate multiple CAN transceivers (CAN-5 transceivers) and / or LIN transceivers. Such a gateway can contain several identical transceivers as described above, which can then be operated by Tierl as transceivers for CAN-XL (CAN-SIC) or 10BASE-T1 S via the controller.

[0038] Further advantageous configurations of the transmitting / receiving device are described in the dependent claims.

[0039] The previously described transmit / receive device may also have a third port for setting one of two predetermined values.

[0040] Voltage levels, whereby the COM-IF acquisition module is also designed to evaluate whether the digital transmit signal at the first terminal occurs in combination with a predetermined voltage level of one of the two predetermined voltage levels at the third terminal. : 0

[0041] It is conceivable that the second comparator has a wider bandwidth than the first comparator.

[0042] According to one embodiment, the previously described transmit / receive device also has a third comparator for evaluating the signals from the bus with a third receive threshold, the voltage value of which differs from the voltage value of the first receive threshold and the voltage value of the second receive threshold, wherein the receive threshold control block is also used to control the voltage value of the

[0043] 5. Third reception threshold based on the evaluation of the COM-IF

[0044] The acquisition module is designed to configure the receiving module to receive signals from the bus and to generate the digital received signal according to the communication standard of the two communication standards with which the transmitted signal was generated. 0

[0045] According to one embodiment, the previously described transmit / receive device also has a fourth comparator for evaluating the signals from the bus with a fourth receive threshold, the voltage value of which differs at least from the voltage value of the second receive threshold and the voltage value of the third receive threshold, wherein the

[0046] The receive threshold control block is also designed to control the voltage value of the fourth receive threshold based on the evaluation of the COM-IF acquisition module, in order to set the receive module to receive the signals from the bus and to generate the digital receive signal according to the communication standard of the two communication standards with which the transmit signal was generated.

[0047] The previously described transmit / receive device can also have a bias block for supplying a bias current to the first to fourth comparator, wherein the bias block is configured to supply the fourth

[0048] To supply a lower bias current to the comparator than to the first to third comparators.

[0049] Optionally, the transmitter module is designed to generate the analog differential signals in a first communication phase of the message with a different physical layer than in a second communication phase, if one of the two communication standards is selected.

[0050] According to one embodiment, the receiver module has three comparators, 5 which comprise the first and second comparator and also the fourth comparator, wherein the receive threshold control block has a resistor circuit for setting the voltage value of the first receive threshold for the first comparator in the first communication phase and for setting the voltage value of the third

[0051] 5. Reception threshold for the first comparator in the second

[0052] Communication phase.

[0053] The previously described transmit / receive device may also include an operating mode selection module for selecting an operating mode of the transmit module .0 and / or the receive module based on an evaluation result of the COM-IF acquisition module.

[0054] The operating mode selection module may be designed to select the operating mode of the transmitting module and / or the receiving module, in addition to the transmit signal at the first connection and the voltage level at the third.

[0055] to evaluate the connection.

[0056] It is conceivable that the receiving module also has a logic block for logically combining the outputs of the at least two comparators to generate the received signal.

[0057] The logic block may be configured to execute the logical operation based on an operating mode selection signal generated by the previously described operating mode selection module. 5

[0058] The two communication standards CAN XL and 10BASE-T1 S are optional.

[0059] The previously described transmit / receive device can be part of a subscriber station for a serial bus system. The subscriber station can also be a communication control device for controlling communication in the bus system and for generating the transmit signal. The subscriber station can be configured for communication in the bus system in which, at least temporarily, exclusive, collision-free access of a subscriber station to the bus of the bus system is guaranteed. At least two of the previously described transmit / receive devices can be part of a gateway for forwarding messages between at least a first bus system and a second bus system, wherein one of the at least two transmit / receive devices of the gateway is connected to the

[0060] 5. The first bus system is connected, and another of the at least two transmitting systems.

[0061] / Receiving equipment is connected to the second bus system.

[0062] The aforementioned problem is further solved by a method for communication with differential signals in a serial bus system with the features of claim 16. The method is implemented with a transmit / receive device for a subscriber station of the bus system, which comprises a transmit module, a receive module, a first terminal, a second terminal, and a COM-IF acquisition module, wherein the method comprises the steps of receiving, at the first terminal, a digital transmit signal from a communication control device, wherein the transmit signal is configured as an analog differential signal to a bus of the bus system in order to send a message to at least one other subscriber station of the bus system; evaluating, with the COM-IF acquisition module, the digital transmit signal with respect to a communication standard of two communication standards.for which the transmit module and the receive module are designed for communication in the serial bus system, switching the transmit / receive device based on the evaluation of the COM-IF acquisition module into one of the two communication standards, receiving, with the receive module, of analog 5 differential signals from the bus for the output of a digital,

[0063] a received signal according to the set communication standard to the communication control unit, wherein the receiving module has a first comparator for evaluating the signals from the bus with a first receive threshold, a second comparator for evaluating the signals from the bus with a second receive threshold whose voltage value differs from a voltage value of the first receive threshold, and a receive threshold control block for controlling the voltage value of the first receive threshold and the voltage value of the second receive threshold based on the evaluation of the COM-IF-5 acquisition module, in order to set the receiving module to receive the signals from the bus and to generate the digital received signal according to the communication standard of the two communication standards with which the transmit signal was generated.

[0064] 5 The procedure offers the same advantages as previously mentioned regarding the transmission-

[0065] / receiving facility.

[0066] Furthermore, the described transmit / receive device, in the method for communicating with differential signals in a serial bus system, also includes a method for setting the transmit / receive device, in particular its receiver module, to one of two communication standards for communicating with differential signals in a serial bus system. Further possible implementations of the invention also include combinations of features or embodiments described previously or subsequently with regard to the exemplary embodiments, which are not explicitly mentioned. In this context, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.

[0067] Drawings

[0068] The invention is described in more detail below with reference to the accompanying drawing and by means of exemplary embodiments. The drawing shows: 5

[0069] Fig. 1 shows a simplified block diagram of a gateway with bus systems according to a first embodiment;

[0070] Fig. 2 is a diagram illustrating the structure of a frame for an 0 message sent by a subscriber station of a bus system according to the first

[0071] Example of implementation can be sent;

[0072] Fig. 3 is a block diagram of a transmitter / receiver of a subscriber station of the bus system of Fig. 1; Fig. 4 is a block diagram of the transmitter / receiver of Fig. 3 when the transmitter / receiver is set for a first communication standard for differential signals on the bus with frame according to Fig. 2;

[0073] Fig. 5 shows a block diagram of the transmitting / receiving device from Fig. 3, when the

[0074] Transmitting / receiving equipment is set for a second communication standard for differential signals on the bus;

[0075] Figs. 6 to 9 show an example of a time course of signals received by the .0 transmit / receive device in the configuration of Fig. 4 for a frame of Fig. 2 or generated on the bus;

[0076] Fig. 10 shows another example of a time course of signals received by the transmit / receive device in the configuration of Fig. 4 in a 5 arbitration phase (SIC operating mode) or generated on the bus;

[0077] Fig. 11 shows the time course of the bus signals CAN_H, CAN_L, which are sent from the transmit / receive device of Fig. 4 to the bus based on the transmit signal of Fig. 10;

[0078] Figures 12 to 15 show an example of the time course of signals received by the transmit / receive device in the configuration of Figure 5 or generated on the bus; and 5

[0079] Fig. 16 shows a block diagram of a receiver module of the transmit / receive device according to the first embodiment; and

[0080] Fig. 17 shows a block diagram of a receiver module of the transmitting / receiving device according to a second embodiment.

[0081] In the figures, identical or functionally equivalent elements are designated with the same reference numerals unless otherwise specified. 5 Description of the exemplary embodiments Fig. 1 shows a first bus system 1 and a second bus system 1A, which are connected to each other via a gateway 5. However, the gateway 5 can be connected to more than two bus systems 1 and 1A, even though this is not shown in Figure 5.

[0082] The first bus system 1 can, for example, be at least partially a CAN bus system, such as a Classical CAN bus system, a CAN FD bus system, a CAN XL bus system, etc., according to the international standard ISO 11898-01:2024. The second bus system 1A can, for example, be at least partially a 10BASE-T1 S bus system according to the international standard IEEE 802.3cg™. However, the bus systems 1 and 1A are not limited to this. In particular, the bus systems 1 and 1A can be configured to operate according to the same communication standard. The bus systems 1 and 1A can be used in a vehicle, especially a motor vehicle, an aircraft, etc., or in a hospital, etc.

[0083] Although the bus systems 1, 1A are described below using CAN bus systems and 10BASE-T1 S-bus systems, none of the bus systems 1, 0, 1A are limited to these. Alternatively, at least one of the bus systems 1, 1A can be another serial bus system 1 that uses differential signals in particular.

[0084] In Fig. 1, the bus system 1 has a plurality of participant stations 10, 20, 30, 5 which, like the gateway 5, are each connected to a bus 40 or bus line with a first bus wire 41 and a second bus wire 42. In a CAN bus system, the bus wires 41 and 42 can also be called CANH and CANL for carrying signals CAN_H and CAN_L on the bus 40. The bus wires 41 and 42 together form the bus line for the bus 40.

[0085] In the example shown in Fig. 1, bus system 1A has a subscriber station 50, which, like gateway 5, is connected to a bus 40A or bus line with a first bus wire 41A and a second bus wire 42A. In a 10BASE-T1 S-bus system 1A, the bus wires 41A and 42B are called LINE+ and LINE-, respectively. The bus wires 41A and 42B together form the bus line for bus 40A.

[0086] Messages 45, 46, 47 can be transmitted via the first bus 40 in the form of signals.

[0087] 5. Messages 48 can be transmitted between the individual participant stations 10, 20, 30 and Gateway 5. Messages 48 in the form of signals can be transmitted between participant station 50 and Gateway 5 via the second bus 40A. Gateway 5 can forward messages 45, 46, 47, each converted into the required communication standard, to bus 40A0 and / or forward a message 48 to bus 40.

[0088] Participant stations 10, 20, 30, 50 are, for example, control units or display devices of a motor vehicle.

[0089] As shown in Fig. 1, the subscriber stations 10, 30 each have a 5 communication control unit 11 and a transmit / receive unit 12.

[0090] The transmit / receive device 12 has a transmit module 121 and a receive module 122.

[0091] The subscriber station 20 has a communication control unit 21 and a transmit / receive unit 22. The transmit / receive unit 22 has a

[0092] Transmitter module 221 and a receiver module 222.

[0093] The subscriber station 50 has a communication control unit 11 A and a transmit / receive unit 12. The transmit / receive unit 12 also has a transmit module 121 and a receive module 122, even if this is in

[0094] Fig. 1 is not shown.

[0095] The transmit / receive equipment 12 of the subscriber stations 10, 30 and the transmit / receive equipment 22 of the subscriber station 20 are each directly connected to the bus 40, even though this is not shown in Fig. 1.

[0096] The same applies to the transmitting / receiving device 12 of the subscriber station 50 with regard to bus 40A.

[0097] The communication control units 11 and 21 each serve to control communication 5 between the respective subscriber station 10, 20, and 30 via bus 40 with at least one other subscriber station of subscriber stations 10, 20, and 30 that is connected to bus 40. The same applies to the communication control unit 11A of subscriber station 50 with respect to bus 40A.

[0098] 5

[0099] The communication control unit 11 creates and reads initial messages 45, 47, which are, for example, modified CAN messages 45, 47. These modified CAN messages 45, 47 are based, for example, on the CAN XL format. The transmit / receive unit 1 is used to send and receive messages 45, 47 from bus 40.

[0100] Transmit module 121 receives a digital transmit signal TxD generated by the communication control unit 11 for one of the messages 45, 47 and converts this signal into signals on bus 40. The digital transmit signal TxD can be a pulse-width modulated signal, at least temporarily or in sections. The receiver module 122 receives signals transmitted on bus 40 according to messages 45 to 47 and generates a digital receive signal RxD from them. The receiver module 122 sends the receive signal RxD to the communication control unit 11. Additionally, the communication control unit 11 can be used to create and

[0101] The device may be configured to read second messages 46, which are, for example, CAN FD messages 46. The transmit / receive device 12 may be configured accordingly. 5 The communication control device 11 A is described in more detail with reference to Fig. 5.

[0102] The communication control unit 21 of Fig. 1 can be implemented like a conventional CAN controller according to ISO 11898-1:2015, i.e., like a CAN FD 0 tolerant Classical CAN controller or a CAN FD controller.

[0103] The communication control unit 21 creates and reads secondary messages 46, for example, CAN FD messages or Classical CAN messages. The transmit / receive unit 22 is used to send and receive the messages 46 from the bus 40. The transmit module 221 receives a digital transmit signal TxD created by the communication control unit 21 and converts it into signals for a message 46 on the bus 40. The receive module 222 receives signals transmitted on the bus 40 corresponding to messages 45 to 47 and generates a digital receive signal RxD from them. The transmit / receive unit 22 may be configured like a conventional

[0104] 5 CAN FD transceivers or CAN SIC transceivers.

[0105] For sending messages 45, 46, 47 with CAN SIC or CAN XL to bus 40, proven features are adopted that are responsible for the robustness and user-friendliness of CAN and CAN FD, in particular the frame structure with identifier and arbitration according to the well-known CSMA / CR standard.

[0106] Procedure. The CSMA / CR procedure results in so-called recessive states on bus 40, which can be overwritten by other participating stations 10, 20, 30 with dominant levels or dominant states on bus 40. 5

[0107] With the two participant stations 10, 30, the formation and subsequent transmission of messages 45, 47 using various CAN formats, in particular the Classical CAN format, the CAN FD format, or the CAN XL format, as well as the reception of such messages 45, 47, is possible. This is described in more detail below for a message 45 : 0.

[0108] If no communication takes place on bus 40, at least one of the participant stations 10, 20, 30, in particular its communication control unit 11, 21, can be put into a sleep mode 5. This saves energy.

[0109] In CAN XL, the subscriber station 10, 30 switches its transmit / receive device 12 to a SLOW or SIC operating mode in order to participate in communication on bus 40. In SLOW or SIC mode, the subscriber station 10, 30 can participate in an arbitration phase 451 (first

[0110] communication phase) of a frame of Fig. 2 participate in an arbitration between the participant stations 10, 20, 30 of the bus system 1.

[0111] Fig. 2 shows a frame 450 for message 45, which is in particular a CAN 5 XL frame, as provided by the communication control unit 11 to the transmit / receive unit 12 for transmission on bus 40. In this embodiment, the communication control unit 11 creates the frame 450 as compatible with CAN FD. Alternatively, the frame 450 is compatible with any successor standard for CAN 5 FD. The frame 450 has a maximum duration T_450, which corresponds to a predetermined maximum frame length.

[0112] According to Fig. 2, the frame 450 for CAN communication on the bus 40 is divided into different communication phases 451, 452, namely an arbitration phase 451 (first communication phase) and a data phase 452.

[0113] (Second communication phase). Frame 450 has, after a start bit SOF, an arbitration field 453, a control field 454, a first switch field 455, a data field 456, a checksum field 457, a second switch field 458, and a frame termination field 459. The checksum field 457, the second switch field 458, and the frame termination field 459 form a frame termination phase 457, 458.

[0114] 459 of the frame 450.

[0115] In arbitration phase 451, an identifier (ID) in the arbitration field 453 is used to negotiate bitwise between participating stations 10, 20, 30 0 which station wants to send the message 45, 46 with the highest priority and therefore receives exclusive access to bus 40 of bus system 1 for sending in the subsequent data phase 452. A physical layer, as used in CAN, CAN FD, or CAN SIC, is employed in arbitration phase 451. Physical layer 5 corresponds to the physical layer or layer 1 of the well-known OSI model.

[0116] (Open Systems Interconnection Model).

[0117] During phase 451, the well-known CSMA / CR protocol is used, which allows simultaneous access by participant stations 10, 20, and 30 to bus 40 without destroying the higher-priority message 45 or 46. This makes it relatively easy to add further bus participant stations 10, 20, and 30 to bus system 1, which is very advantageous.

[0118] The CSMA / CR method results in so-called recessive states 5 on bus 40, which can be overwritten by other participating stations 10, 20, 30 with dominant levels or dominant states on bus 40. In the recessive state, high impedance conditions prevail at the individual participating station 10, 20, 30, which, in combination with the parasitic effects of the bus circuitry, leads to longer time constants.

[0119] This has five consequences. This leads to a limitation of the maximum bitrate of today's technology.

[0120] CAN-FD physical layers currently achieve approximately 2 megabits per second in real-world vehicle applications.

[0121] At the end of the arbitration phase 451, the first switching field 455,0 switches to the operating mode for the data phase 452. With CAN-XL, the subscriber station 10, 30, in particular its transmit / receive unit 12, which won the arbitration and is therefore the sender of the frame 450 in the data phase 452, switches to a FAST_TX operating mode. However, with CAN XL, the subscriber station 10, 30, in particular its transmit / receive unit 12, which lost the arbitration and is therefore in the

[0122] The data phase is only the receiver of frame 450, in an operating mode FAST_RX.

[0123] In data phase 452, in addition to part of the first switching field 455, the payload data of the CAN-XL frame 450 or the message 45 from the 0 data field 456 as well as the checksum field 457 and part of the second

[0124] Switching field 458 is sent. At the end of the data phase 452, the system switches back to the arbitration phase 451 using the second switching field 458. 5 A sender of message 45 only begins sending bits of the data phase 452 to bus 40 when the receiving station 10, as the sender, has won the arbitration and thus has exclusive access to bus 40 of bus system 1 for sending. 0 Thus, in the arbitration phase 451, the receiving stations 10 and 30 partially use, especially up to and including the FDF bit, a format known from CAN / CAN-FD according to ISO 11898-1:2015. However, in comparison to CAN or CAN FD, in the data phase 452 as the second communication phase, an increase in the net data transmission rate to over 10 5 megabits per second, especially 20 Mbit / s, is possible.Furthermore, it is possible to increase the size of the payload per frame, especially to about 2kbyte or any other value.

[0125] Fig. 3 shows the transmitting / receiving device 12 in more detail, which is used for one of the

[0126] The transmitter / receiver unit 12 can be used with 5 subscriber stations (10, 30). It has a TXD / TX connection for a transmit signal from Fig. 6, Fig. 10, or Fig. 12, or the reset signal from Fig. 16; an RXD / RX connection for a receive signal from Fig. 9 or Fig. 15; an STB / ED connection, particularly for a status signal; a CANH / LINE+ connection for the CAN_H or LINE+ signal; and a CANL / LINE- connection for the CAN_L or LINE- signal. Additionally, the transmitter / receiver unit 12 has connections for a power supply (VCC), ground (GND), and VIO for an optional alternative power supply to the TXD / TX, RXD / RX, and STB / ED connections. However, the number of connections on the transmitter / receiver unit 12 is not limited to the aforementioned 8 connections. Instead, the

[0127] The number of connections can be selected according to requirements.

[0128] The transmit / receive unit 12 also has the transmit module 121, the receive module 122, an operating mode selection module 123, and a communication interface acquisition module 124.

[0129] The communication interface acquisition module 124 is hereinafter referred to as the COM-IF acquisition module 124. The receiver module 122 and its interaction with the operating mode selection module 123 are also described in more detail with reference to Fig. 16. 5

[0130] As shown in Fig. 3, the COM-IF acquisition module 124 has a test block 1241 for checking the status of the TXD / TX, STB / ED terminals and / or a signal at the respective TXD / TX, STB / ED terminal. Furthermore, the COM-IF acquisition module 124 has a decision block 1242 for deciding which communication control unit 11, 11A to connect to the transmit / receive unit.

[0131] 12 is connected. The COM-IF acquisition module 124 thus performs an evaluation of the state, in particular the voltage level or resistance value, of the TXD / TX, STB / ED terminals and / or a signal at the respective TXD / TX, STB / ED terminal. This is described in more detail below in section 5. The transmitter module 121 can be configured as a full bridge with four transmission stages, which are not shown in the figures. The transmitter module 121 has an internal resistance of 1211.

[0132] 5

[0133] The COM-IF acquisition module 124 can be a digital component, specifically a discrete-time system. The COM-IF acquisition module 124 can be operated at a predetermined frequency suitable for testing the signal at the TXD / TX connector. Specifically, the frequency is greater than 400 MHz.

[0134] The transmitting / receiving device 22 can be constructed in the same way as the transmitting / receiving device 12. Therefore, the transmitting / receiving device 22 is not described separately. 5

[0135] In the transceiver 12, the voltage supply for the first and second bus wires 41, 42 is provided via at least one VCC terminal. Specifically, a voltage of 5 V or 3.3 V, or any other desired voltage, can be connected to the VCC terminal. The connection to ground, in particular CAN_GND, is implemented via the GND terminal.

[0136] The transmitter / receiver unit 12 can be connected to bus 40 via the CANH / LINE+ and 5 CANL / LINE- connections, more precisely to its first bus wire.

[0137] 41 for CAN_H or CAN-XL_H or LINE+ and its second bus wire 42 for CAN_L or CAN-XL_L or LINE-. More precisely, the transmitter module 121 is connected at its output to the CANH / LINE+ and CANL / LINE- terminals. Furthermore, the receiver module 122 is connected at its input to the CANH / LINE+ and CANL / LINE- terminals.

[0138] The transmitter module 121 is connected at its input to the TXD / TX terminal to receive a transmit signal TxD, as shown in Fig. 6 or Fig. 10, from the communication control unit 11 of Fig. 1 or 5 to receive a transmit signal Tx, as shown in Fig. 12 or Fig. 16. Furthermore, the transmitter module 121 is connected at its input to an output of the operating mode selection module 123, at which an operating mode selection signal B_SW containing information for selecting the operating mode to be switched is output.

[0139] 5

[0140] The receiver module 122 is also connected at its input to the output of the operating mode selection module 123, at which the operating mode selection signal B_SW is output. A first output of the receiver module 122 is connected to the RXD / RX terminal for outputting .0 of a receive signal RxD shown in Fig. 9 to the

[0141] Communication control unit 11 of Fig. 1 or for outputting a received signal Rx, as shown in Fig. 15. A second output of the receive module 122 is connected to the STB / ED terminal. 5 The operating mode selection module 123 of Fig. 3 is connected to a first

[0142] The input terminal is connected to the TXD / TX terminal for receiving the transmit signal TxD or Tx, as described previously. Additionally, the mode selection module 123 of Fig. 3 is connected at a second input terminal to the output of the COM-IF acquisition module 124. Furthermore, the mode selection module 123 of Fig. 3 is connected at a third input terminal to the STB / ED terminal. The output terminal of the mode selection module 123 is connected to the transmit module 121 and the receive module 122, as described previously. 5 The COM-IF acquisition module 124 of Fig. 3 is connected at its first

[0143] The input port is connected to the TXD / TX connector to receive the transmit signal TxD or Tx, as described previously. Additionally, the COM-IF acquisition module 124 from Fig. 3 is connected to the STB / ED connector at its second input port. : 0

[0144] The COM-IF acquisition module 124 evaluates the input at the TXD / TX and STB / ED ports to determine whether the transmit / receive device 12 is connected to a communication control unit 11 (CAN-XL controller) or a communication control unit 11A (10BASE-T1 S controller) as shown in Fig. 5. The COM-IF acquisition module 124 outputs its evaluation result to the operating mode selection module 123.

[0145] The operating mode selection module 123 is designed to derive the inputs to the

[0146] 5 TXD / TX and STB / ED ports and the output of module 124, the current

[0147] to determine the operating mode, namely, for example, SLEEP, SLOW or SIC, FAST_TX, FAST_RX for CAN XL or LOW_POWER, NORMAL, TRANSMITTING, CONFIG for 10BASE-T1 S. 0. In addition, the operating mode selection module 123 is designed to

[0148] The result of the determination, i.e., the information about the operating mode, is forwarded to modules 121 and 122 in the signal B_SW. In particular, the operating mode selection module 123 uses the signal B_SW to switch the operating mode of the transmitting module 121 and the operating mode of the receiving module 122 according to the required communication standard for which the transmitting module 121 is used.

[0149] The receiver 12 is to be used. This is described below with reference to Fig. 4 in relation to a CAN bus system 1 and with reference to Fig. 5 in relation to a 10BASE-T1 S-bus system 1A, and described in more detail for the receiver module 122 with reference to Fig. 16.

[0150] Fig. 4 shows that the transmitter / receiver 12 is connected in a CAN bus system 1 for communication according to the CAN XL standard between the communication control unit 11 of Fig. 1 and a DC choke 13. The DC choke 13 is connected 5 via a line connector 15 to the bus wires 41, 42 of the bus line for the

[0151] Bus 40 is connected. The DC choke 13 is also called a common-mode choke (CMC). The bus wires 41 and 42 can be configured as twisted pairs. The first and second bus wires 41 and 42 are terminated with a terminating resistor 49. The terminating resistor 49 is an external load resistor for the

[0152] Transmitter module 121. As mentioned previously, the transmitter module 121 can be configured as a full bridge with four transmit stages. The resistor 49 is connected in the bridge branch of the full bridge between the CANH / LINE+ and CANL / LINE- terminals of the transmitter / receiver unit 12, more precisely of the transmitter module 5 121, for the bus wires 41, 42. Fig. 5 shows that the transmitter / receiver unit 12 is connected in a 10BASE-T1 S bus system 1 A for communication according to the 10BASE-T1 S standard between the communication control unit 11 A and the DC choke 13.

[0153] 5 is switched. The DC choke 13 is connected via an AC voltage

[0154] Decoupling module 14, in particular a decoupling capacitor, is connected to the line connector 15 and thus to the bus wires 41, 42 and the terminating resistor 49. The communication control unit 11 A is designed to control communication according to the 10BASE-T1 S .0 standard. The AC decoupling module 14 can also be used for AC-

[0155] This can be called the decoupling module. Otherwise, the same applies to the transmitter module 121 as described with reference to Fig. 3 and / or Fig. 4.

[0156] As shown in Fig. 4 and Fig. 5, the RXD / RX and STB / ED connections of the transmit / receive device 5 (transceiver) 12 are for the

[0157] Can be used in bus systems 1 and 1A, with different switching options.

[0158] The following Table 1 shows an example of the types and functions of the individual connectors (SO8 connector or SO8 pin) of the transmit : 0 / receive device 12.

[0159]

[0160] Table 1: Comparison of the type and function of the connections of the transmit / receive device 12 for CAN XL and 10BASE-T1 S

[0161] 5. If the transceiver 12 is configured as shown in Fig. 4, the signals from Fig. 6 to Fig. 11 are received or generated at the terminals of the transceiver 12. The transceiver 12 can be switched to different operating modes: SLEEP, SLOW or SIC, FAST_TX, FAST_RX, as specified in the international standard ISO 11898-1:2024 for CAN. Fig. 6 shows an example of the time course of a digital transmit signal TxD, which the transceiver 12 receives serially from the communication control unit 11 for a frame 450 of Fig. 2. The transmit signal TxD is divided over time t into the two communication phases 451 and 452.

[0162] 5 subdivided, as previously described.

[0163] In the first communication phase (arbitration phase) 451, the transmitted signal TxD has bits with a bit time t_bt1 and the two distinct states Hl (high), in particular 1, and LW (low), in particular 0. In the second communication phase (data phase) 452, the transmitted signal TxD is at least temporarily a pulse-width modulated signal with a bit time t_bt2 and the two distinct states LVO, LV1. The bit time t_bt2 is shorter than the bit time t_bt1. 5 According to Fig. 6, the transmit / receive device 12, as well as the

[0164] Transceiver 22, in the first communication phase (arbitration phase) 451, uses a first physical layer 451_P to transmit the transmit signal TxD from Fig. 6 as differential bus signals CAN_H, CAN_L according to Fig. 7 to bus 40. The physical layer 451_P has the operating mode 0 SLOW or SIC of the transceiver 12, as described above and in more detail below.

[0165] However, in the second communication phase (data phase) 452, the transmit / receive device 12 according to Fig. 6 can use a second physical layer 452_P 5, which differs from the first physical layer 451_P, to send the transmit signal TxD from Fig. 6 as differential bus signals CAN_H, CAN_L according to Fig. 7 to the bus 40. The physical layer 452_P has two operating modes for the transmit / receive device 12, namely FAST_TX and FAST_RX, as described in more detail above.

[0166] As shown in Fig. 7, the signals CAN_H and CAN_L are serial analog signals and alternately have at least one dominant state 401 and / or at least one recessive state 402. In the dominant state 401, U = VCAN_H = 3.5 V and U = VCAN_L = 1.5 V. In the recessive state 402, U = VCAN_H = VCAN_L = 2.5 V. A dominant state 401 (dorn) is driven in phase 451 with NRZ encoding of the transmit signal TxD when TXD = 0 or LW (LOW). A recessive state 402 (rec) is generated, or occurs in phase 451 with NRZ encoding of the transmit signal TxD, when TXD = 1 or Hl (HIGH).

[0167] 5

[0168] After the arbitration in arbitration phase 451, one of the participating stations 10, 20, 30 is determined as the winner. If the respective participating station 10, 30 recognizes the signal in the first switching field 455 of Fig. 2 for switching from the first to the second communication phase 0 451, 452, the associated transmit / receive device 12 switches its physical

[0169] Layer 451_P at the end of Arbitration Phase 451 is converted into Physical Layer 452_P of Data Phase 452, as previously described.

[0170] As shown in Fig. 7, the transmitter module 121 of the transmitter then generates in the 5 data phase 452 or in the second operating mode (FAST_TX) depending on the

[0171] The transmit signal TxD from Fig. 6 sequentially and thus serially transmits the states L0 or L1 to the physical layer 452_P for the signals CAN_H and CAN_L on bus 40. State L0 (VCAN_H = 3.0 V, VCAN_L = 2.0 V) is driven by pulse-width modulation (PWM encoding) of the transmit signal TxD for a first PWM symbol within the transmit signal TxD. State L1 (VCAN_H = 2.0 V and VCAN_L = 3.0 V) is driven by pulse-width modulation (PWM encoding) of the transmit signal TxD for a second PWM symbol LV1, which differs from the first PWM symbol LVO, within the transmit signal TxD. 5. The frequency of the signals CAN_H, CAN_L can be increased according to the transmit signal TxD in the data phase 452. In the example of Fig. 6 and Fig. 7, the bit time or bit duration t_bt2 in the data phase 452 is shorter or less than the bit time or bit duration t_bt1 in the arbitration phase 451. Thus, the net data transmission rate in the data phase 452 in the example of Fig. 6 and Fig. 7 is...70 increased compared to the arbitration phase 451.

[0172] In contrast, for example, the transmit / receive device 1 of the subscriber station 30 switches its Physical Layer 451_P at the end of the arbitration phase 451 from the first operating mode (SLOW or SIC) to the Physical Layer 452_P of the 5 data phase 452 for the third operating mode (FAST_RX) of the transmit / receive device 12, if the subscriber station 30 is only a receiver, i.e., not a sender, of the frame 450 in the data phase 452.

[0173] Does the transmitting / receiving device 12 recognize, in particular with the signaling in

[0174] 5 the second switching field 458 of Fig. 2, that a switching from the data phase

[0175] To return to the arbitration phase 451, the transmit / receive device 12 switches from transmitting (operating mode FAST_TX) and / or receiving (operating mode FAST_RX) signals with physical layer 452_P to transmitting and / or receiving signals with physical layer 451_P. Thus, after the end of the data phase 452, all transmit / receive devices 12 switch their operating mode to the first operating mode (SLOW or SIC). Therefore, all transmit / receive devices 12 can not only switch between bit times t_bt1 and t_bt2, but also switch their physical layer, as described previously. 5 According to Fig. 8, in the arbitration phase 451, a differential signal VDIFF = CAN_H - CAN_L is ideally generated on bus 40 over time t, with values ​​of VDIFF = 2V for dominant states 401 (dorn) and VDIFF = 0V for recessive states 402 (rec). The waveform of VDIFF in phase 451 is shown on the left side of Fig. 8.In contrast, during data phase 452, a 0 difference signal VDIFF = CAN_H - CAN_L is formed on bus 40 over time t, corresponding to the states L0, L1.

[0176] Fig. 7 is shown as on the right side of Fig. 8. State L0 has a value VDIFF = 1 V. State L1 has a value VDIFF = -1 V.

[0177] The receiver module 122 can distinguish between states 401 and 402 using any two of the 5 receive thresholds T1_CAN, T2_CAN, and T3_CAN, which are located in the ranges

[0178] TH_T1, TH_T2, TH_T3 are located. For this purpose, the receiver module 122 evaluates the signals from Fig. 7 or Fig. 8 at times t_A, as shown in Fig. 8. To evaluate the signals from Fig. 7 or Fig. 8, the receiver module 122 uses the receive threshold T1_CAN of, for example, 0.7 V and the receive threshold T2_CAN of, for example, -0.35 V during the arbitration phase 451. In contrast, the

[0179] In data phase 452, receiver module 122 outputs the signals with the receive threshold T3_CAN. When switching between the first to third operating modes (SLOW or SIC, FAST_TX, FAST_RX), which were previously described with reference to Fig. 6, receiver module 122 switches the receive thresholds T2_CAN and T3_CAN respectively.

[0180] The receive threshold T2_CAN is used to detect whether bus 40 is free, 5 when the subscriber station 12 is newly added to the communication on bus 40 and attempts to integrate itself into the communication on bus 40.

[0181] Upon receiving the corresponding signals from bus 40, each transmitting / receiving device 12 generates the associated receive signal RxD, as shown in Fig. 9. Ideally, the receive signal RxD in Fig. 9 has no time offset from the transmitting signal TxD in Fig. 6.

[0182] Fig. 10 shows an example of a part of the digital transmit signal TxD, which transmits to the transmitting module 121 in the arbitration phase 451 from the

[0183] Communication control unit 11 receives the signal and generates the CAN_H and CAN_L signals for bus 40. In Fig. 10, the transmitted signal TxD changes from a state LW (Low) to a state Hl (High) and back to the state LW (Low).

[0184] As shown in more detail in Fig. 11, the transmitter module 121 generates the signals CAN_H and CAN_L for the bus wires 41 and 42 for the transmit signal TxD from Fig. 10 such that an additional state 403 (sic) is present. The state 403 (SIC) can have different durations, as shown by state 403_0 (SIC) during the transition from state 402 (rec) to state 401 (dorn) and state 403_1 (sic) during the transition from state 401 (dom) to state 402 (rec). State 403_0 (sic) is shorter in duration than state 403_1 (sic). To generate signals according to Fig. 11, the transmitter module 121 is switched to SIC mode.

[0185] The passage through the short sic state 403_0 is not required in the CiA610-3, and the state depends on the implementation. The duration of the "long" state 403_1 (sic) is specified for both CAN-SIC and the SIC operating mode in CAN-XL as t_sic < 530 ns, starting with the rising edge of the transmit signal TxD in Fig. 10. In the "long" state 403_1 (SIC), the transmit module 121 should adjust the impedance between the bus conductors 41 (CANH) and 42 (CANL) as closely as possible to the characteristic impedance Zw of the bus line used.

[0186] Adjust 5. Here, Zw = 1000 ohms or 120 ohms. This adjustment prevents

[0187] Reflections and thus allow operation at higher bit rates. For simplicity, the following will always refer to state 403 (sic) or state 403 (sic). 0 The transmitter module 121 can be used to generate signals for bus 40 for the following CAN types: CAN-FD, CAN-SIC and CAN-XL.

[0188] Table 2: CAN types for transmitter module 121 5 Thus, the transmitter module state 403 (sic) can occur not only with CAN-SIC or CAN-

[0189] The transmit module state 403 can also be generated in CAN-FD. However, in CAN-FD, the time for transmit module state 403 can be shorter than in CAN-SIC or CAN-XL. The transmit module 121 can therefore generate two different bus states in CAN-FD, three different bus states in CAN-SIC, and five different states in CAN-XL. In summary, the parameters in Table 3 below apply to the different operating modes SLOW and FAST (FAST_TX, FAST_RX) in CAN-XL.

[0190] Table 3: Parameters for CAN XL

[0191] If the transceiver 12 is configured as shown in Fig. 5, the signals shown in Figs. 12 to 15 are received or generated at the terminals of the transceiver 12. The transceiver 12 can be switched between different operating modes: LOW-POWER, NORMAL, TRANSMITTING, and CONFIG, as specified in the international standard IEEE 802.3cg™ for

[0192] 10BASE-T1 S specified.

[0193] Fig. 12 shows an example of a time course of a digital transmit signal Tx, which the transmit / receive device 12 receives from the communication control device 11 A of Fig. 5 in order to transmit the signal

[0194] Tx sends differential bus signals LINE+, LINE- according to the 10BASE-T1 S standard to bus 40A of bus system 1A;

[0195] According to Fig. 12, the transmitted signal Tx is divided over time t into several communication phases 460, 461, 462, which correspond to the individual

[0196] Subscriber stations 10, 20, and 30 are assigned to transmit by a master subscriber station. During communication phases 460 and 462, the transmit / receive unit 12, specifically its transmit module 121 and receive module 122, is in NORMAL mode. During communication phase 461, the transmit / receive unit 12 is permitted to transmit on bus 40A. Therefore, during phase 461, the transmitting mode is enabled for the transmit / receive unit 12, specifically its transmit module 121 and receive module 122. Transmitting permission is assigned according to a round-robin algorithm, in which each subscriber station receives a transmit time slot 0 in a transmission cycle, thus preventing collisions on bus 40A. In communication phases 460, 461, 462, the transmit signal Tx has bits with a bit time t_bt and the two different states Hl (high), in particular 1, and LW (low), in particular 0.

[0197] As shown in Fig. 13, the transmitting / receiving device 12 sends the

[0198] 5. Transmit signal Tx from Fig. 12 as serial analog signals LIN E+, LINE- on the

[0199] Bus 40A. The signals alternately have at least one state V0, also called VLINE_POS, and / or at least one state V1, also called VLINE_NEG. According to Fig. 14, in the ideal case, the following occurs on bus 40A over time t:

[0200] Differential signal V_L is output. For state V0, U = V_L (VO) = ​​+0.5 V. For state V1, U = V_L (V1) = -0.5 V.

[0201] The receiver module 122 can distinguish the states VO, V1 each using any two of the 5 receive thresholds T1_ETH, T2_ETH, T3_ETH, which are defined in the

[0202] The ranges TH_T1, TH_T2, TH_T3 are located here. For this purpose, the receiver module 122 samples the signals from Fig. 13 or Fig. 14 at predetermined times. To evaluate the sampling result, the receiver module 122 uses all three reception thresholds T1_ETH, T2_ETH, T3_ETH in both NORMAL and TRANSMITTING operating modes. In contrast, the

[0203] Receiver module 122 in LOW-POWER mode only uses the two receive thresholds T2_ETH and T3_ETH. The receive threshold T1_ETH typically has a value of 0.0 V, the receive threshold T2_ETH typically has a value of +0.15 V, and the receive threshold T3_ETH typically has a value of -0.15 V. When switching between the

[0204] In the operating modes (NORMAL, TRANSMITTING, LOW-POWER) previously described with reference to Fig. 6, the receiver module 122 switches the receive thresholds T1_ETH, T2_ETH, T3_ETH as needed. Upon receiving the corresponding signals from bus 40, each transmit-

[0205] The receiving device 12 receives the associated received signal Rx, as shown in Fig. 15. Ideally, the received signal Rx has no time offset from the transmitted signal Tx. In summary, for 10BASE-T1 S, the parameters in Table 4 below apply to the different operating modes NORMAL and TRANSMITTING.

[0206] Table 4: Parameters for 10BASE-T1 S

[0207] To configure the transmitter / receiver 12 as shown in Fig. 4 or Fig. 5, the transmitter / receiver 12 proceeds as described below.

[0208] After switching on the supply voltage at the VCC terminal, also known as power-up, the transmitter module 121 initially remains in a high-impedance state on the bus side. "High-impedance state" here means that the resistance value of the internal resistor 1211 in the transmitter module 121 is set to a value at least as high as the resistance value of the bus termination resistor 49. This ensures that the bus 40, 40A is not blocked with potentially incorrect symbols. The transmitter module 121 remains in this high-impedance state on the bus side until the evaluation by module 124 confirms whether a communication control unit 11 is connected to the inputs of the transmitter / receiver 12, in which case the unit 12 should behave according to the CAN, in particular CAN-XL, standard, or whether a communication control unit 11A is connected, in which case the

[0209] Facility 12 should behave according to the 10BASE-T1 S standard.

[0210] The COM-IF acquisition module 124 forwards the respective decision as an evaluation result to the operating mode selection module 123. Once the checking and / or evaluation is completed with modules 123 and 124, in particular a decision has been made regarding the communication standard, the transmit / receive device 12 behaves according to the corresponding communication standard.

[0211] 5

[0212] However, the transmit / receive unit 12 is designed to further perform the evaluation with modules 123 and 124 for plausibility checks. This ensures that any errors, such as a short circuit at the STB / ED and / or TX / TXD terminals, are detected.

[0213] Fig. 16 shows the receiver module 122 in more detail. The receiver module 122 has a receive threshold control block 1221, a bias block 1222, a logic block 1223, comparators 122A, 122B, 122C, 122D, resistors RD1, RD2, RD3, RD4, a first bias resistor RB1, and a second bias resistor RB2.

[0214] The receive threshold control block 1221 receives the operating mode selection signal B_SW of the operating mode selection block of Fig. 3 at its input. Based on the operating mode selection signal B_SW, the receive threshold control block 1221 generates control signals Vth_A, Vth_B, Vth_C, Vth_D to control the receive thresholds for the comparators 122A, 122B, 122C, 122D, as described previously. The receive threshold control block 1221 can use a circuit of resistors for this purpose, as previously described with reference to the prior art. The receive thresholds for the five comparators 122A, 122B, 122C, 122D can also be called switching thresholds. The operating mode selection signal B_SW is also passed to the logic block 1223.

[0215] The inputs (+) for positive potential of comparators 122A, 122B, 122C, 122D are each connected to the bus terminal via the first resistor RD1.

[0216] CANH / LINE+ is connected. Additionally, the inputs (+) for positive potential of comparators 122A, 122B, 122C, and 122D are each connected to the output of bias block 1222 via the third resistor RD3. The inputs (-) for negative potential of comparators 122A, 122B, 122C, and 122D are each connected to the CANL / LINE- bus terminal via the second resistor RD2. Additionally, the inputs (-) for negative potential of comparators 122A, 122B, 122C, and 122D are each connected to the output of bias block 1222 via the fourth resistor RD4.

[0217] 5. The input of the bias block 1222 is connected to the junction of the first and second bias resistors RB1 and RB2. The first and second bias resistors RB1 and RB2 are connected in series. The first bias resistor RB1 is connected at its free end to a potential Vdd. The second bias resistor RB2 is connected at its free end to a potential Vss. A bias current l_B is generated across the resistors RB1 and RB2. The bias block

[0218] 1222 outputs a bias voltage VCM, which can also be called a bias voltage. 5 The logic block 1223 is connected at its first input to the output of the first

[0219] Comparator 122A connected. To a second input of the logic block.

[0220] The output of the second comparator 122B is connected to 1223. The output of the third comparator 122C is connected to a third input of logic block 1223. The 0 output of the fourth comparator 122D is connected to a fourth input of logic block 1223. A fifth

[0221] The B_SW signal from the input of the receive threshold control block 1221 is forwarded to the input of logic block 1223. Additionally, logic block 1223 is connected to the RXD / RX terminal at its first output. Its second output is connected to the STB / ED 5 terminal.

[0222] The logic block 1223 is designed to logically combine the outputs of at least two of the comparators 122A, 122B, 122C, 122D based on the operating mode selection signal B_SW in order to generate the receive signal RxD from Fig. 9 or the receive signal RX from Fig. 15 and then output it to the

[0223] to forward the RXD / RX connection. This is also described previously with regard to checking the receive thresholds in Figures 7 to 9 for CAN and in Figures 13 to 15 for 10BASE-T1 S. The following Table 5 shows the minimum (Min), typical (Typ), and maximum (Max) voltage values ​​in mV for the respective receive thresholds T1_CAN, T2_CAN, T3_CAN, and T4_CAN for CAN XL and the respective receive thresholds T1_ETH, T2_ETH, and T3_ETH for 10BASE-T1 S for the operating modes of CAN XL 5 and 10BASE-T1 S. In Table 5, the receive thresholds are listed as VDIFF-

[0224] Called the switching threshold.

[0225] Table 5: VDIFF switching thresholds / receive thresholds for the operating modes in

[0226] CAN XL and 10BASE-T1 S 0

[0227] In the receiver module 122 of Fig. 16, the four comparators 122A, 122B, 122C, 122D are provided in the present embodiment. The reception thresholds for the two different communication standards 5 CAN XL, per operating mode, and 10BASE-T1 S are set for the four comparators 122A, 122B, 122C, 122D as follows.

[0228] Table 6: Comparators used and their set receive thresholds for CAN XL, per operating mode, and for 10BASE-T1 S

[0229] In CAN XL, only the following are used in SLOW or SIC operating mode:

[0230] 5 receive thresholds T1_CAN and T2_CAN used in the FAST-

[0231] In operating modes (FAST_TX, FAST-RX), the receive threshold T3_CAN is used. Optionally, the receive threshold T2_CAN is also used, as previously described with reference to Figures 6 to 9. Accordingly, in SLOW or SIC operating mode, particularly in the first communication phase 451, logic block 1223 for CAN XL combines the outputs of comparators 122A and 122B, specifically with a logical AND gate. The output of comparators 122C and 122D is not used and / or is forwarded to the RXD / RX terminal. Furthermore, in FAST operating modes (FAST_TX, FAST-RX), logic block 1223 for CAN XL can combine the outputs of comparators 122B and 122C, specifically with a logical AND gate, particularly in the second communication phase 452. In this case, the output of comparators 122A and 122D is not used and / or forwarded to the RXD / RX terminal. Alternatively, logic block 1223 is used and / or forwarded in FAST operating modes.

[0232] (FAST_TX, FAST-RX), especially in the second communication phase 452, only the output of the comparator 122C is passed on.

[0233] Depending on the configuration of logic block 1223, the logical operation 5 can contain at least one AND operation. Alternatively or additionally, the

[0234] Logic block 1223 contains at least one OR gate and / or at least one other logical gate to implement the functions described above. The comparator 122B for checking the receive threshold T2 in CAN XL is also called the OOB comparator, where OOB stands for Out-of-Boundary. With the comparator 122B, the transceiver 12, when switched to SLOW or SIC mode, can receive signals on bus 40.

[0235] 5 detect, which are another one switched to FAST operating mode

[0236] Transceiver 12 has sent data to bus 40. For this purpose, comparator 122B is set to a comparatively high bandwidth.

[0237] The second and fourth comparators 122B and 122D can each have a larger bandwidth than the first comparator 122A and a larger bandwidth than the third comparator 122C. Furthermore, the response time of each of the second and fourth comparators 122B and 122D can be slower than the response time of each of the first and third comparators 122A and 122C. For this purpose, the bias block 1222 controls its bias voltage VCM accordingly.

[0238] The receiver module 122 configures the comparator 122D in SLEEP mode for CAN, especially CAN XL, such that the comparator 122D detects a wake-up pattern on bus 40 with a threshold T4_CAN between 0.4 V and 1.15 V. For this purpose, the comparator 122D is operated with a significantly lower bias current l_B than the other comparators.

[0239] 122A, 122B, 122C. This allows power consumption to be minimized in SLEEP mode.

[0240] For 10BASE-T1 S, the receive module 122 is configured to check the nominal receive threshold using comparator 122A, which is typically always at T1_ETH = 0V. Furthermore, according to the 10BASE-T1 S standard (OPEN Alliance 10BASE-T1 S PMD Transceiver Interface TC14 - Interoperability Specifications), the receive module 122 is configured so that comparators 122B and 122D check receive thresholds of -150mV and +150mV, which are used for wake-up and collision detection.

[0241] Detection) and traffic detection on bus 40A.

[0242] Accordingly, logic block 1223 for 10BAS ET 1 S combines the outputs of comparators 122A, 122B, 122C, and especially 5, with a logical AND gate in all operating modes, whereby the output of comparator 122D is not used and / or is forwarded to the RXD / RX terminal. Depending on the configuration of logic block 1223, the logical operation can include at least one AND gate. Alternatively or additionally, logic block 1223 has at least one OR gate and / or at least one other gate.

[0243] 5 logical connections to implement the functions described above.

[0244] The use of the four comparators 122A, 122B, 122C, 122D is the simplest circuit design for the receiver module 122 of Fig. 16. Furthermore, this design of the receiver module 122 offers the greatest potential for optimization in order to generate the corresponding switching thresholds.

[0245] Second embodiment 5 According to a second embodiment, the receiving module 16 of Fig.

[0246] 16 only three comparators, namely comparators 122A, 122B, 122D. The receive threshold control block 1221 has a resistor circuit 1221 A. The logic block 1223 has a derivation unit 1223A. : 0 For CAN, especially CAN XL, the following applies. The resistor circuit 1221 A sets the voltage value of the first receive threshold T1_CAN for the first comparator 122A in response to the signal B_SW during the first communication phase 452. Furthermore, the resistor circuit 1221 A sets the voltage value of the third for the first comparator 122A in response to the signal B_SW during the second communication phase 452.

[0247] Receive threshold T3_CAN is set. Thus, comparator 122A is used to set the first receive threshold T1_CAN in SLOW or SIC mode and to set the third receive threshold T3_CAN in FAST modes (FAST_TX, FAST-RX), as shown in Table 70 below. This is possible because the receive / switching thresholds

[0248] T1_CAN and T3_CAN are not used in the same operating mode in CAN, especially CAN XL, as previously described and shown in Fig. 8. This allows comparator 122C to be omitted. However, for the 10BASE-T1 S communication standard, instead of a separate threshold for OV (T1_ETH), the receive / switching thresholds T2_ETH and T3_ETH are used to detect edges on bus 40 and 40A. This is possible because the 10Base-T1 S standard only specifies a timing requirement between exceeding the OV threshold and a

[0249] A response exists at the RX port, but none to detect bus traffic with voltages below 150mV.

[0250] Thus, block 1221 controls the comparators for the communication standard 10BASE-T1 S, such that comparator 122 A sets the second receive threshold.

[0251] The comparator 122B sets the third receive threshold, T3_ETH, and the derivation unit 1223A is configured to derive the first receive threshold, T1_ETH, from the receive thresholds T1_ETH and T3_ETH. In other words, the first receive threshold, T1_ETH, is derived from the outputs of comparators 122A and 122B, as shown in Table 7 below. For this purpose, the derivation unit 1223A has logic blocks that evaluate the outputs of comparators 122A and 122B to perform an evaluation of the signals on bus 40A with the first receive threshold, T1_ETH. Table 7: Comparators used and their settings

[0252] Receive thresholds for CAN XL, per operating mode, and for 10BASE-T1 S

[0253] The use of only the three comparators 122A, 122B, 122D compared to the receiver module 122 of Fig. 16 has the advantage that in the embodiment 5 presented here, the receiver module 122 requires fewer

[0254] The semiconductor area required is greater than for the receiver module 122 of Fig. 16.

[0255] Third embodiment. According to a third embodiment, the receiver module 16 of Fig. 16, as in the second embodiment, has only three comparators, namely comparators 122A, 122B, and 122D. For CAN, comparators 122A, 122B, and 122D are configured as in the second embodiment, as also shown in the

[0256] 5 shown in the following Table 8.

[0257] However, for the communication standard 10BASE-T1 S, the comparator 122A sets the second receive threshold T2_ETH, the comparator 122B sets the third receive threshold T3_ETH, and the comparator 122D sets the first receive threshold T1_ETH.

[0258] Table 8: Comparators used and their settings

[0259] Receive thresholds for CAN XL, per operating mode, and for 10BASE-T1 S 5. Thus, the threshold T1 _ETH is additionally available via the wake-up parameter 122D.

[0260] (Wake-up comparator) set.

[0261] Furthermore, in this embodiment, for comparator 122D, both the switching / receiving threshold o and the bias current for comparator 122D are adjusted to set the threshold T1_ETH. This improves the bandwidth and response time of comparator 122D. Consequently, comparator 122D has a smaller bandwidth when the receiver module 122 is set to the threshold T1_ETH for the second communication standard, in particular 10BASE-T1 S, than when the receiver module 122 is set to the threshold T4_CAN for the first communication standard, in particular CAN XL. Furthermore, the comparator 122D has a shorter response time when the receiver module 122 is set for the second communication standard, in particular 10BASE-T1 S, than when the receiver module 122 is set for the first communication standard, in particular CAN XL.

[0262] The comparator 122D therefore reacts faster for the second communication standard, especially 10BASE-T1 S, than for the first communication standard, especially CAN XL.

[0263] In this way, the timing requirements for 10Base-T1 S, which are specified in the

[0264] The requirements of version 2 of the standard are better met than in the second embodiment.

[0265] Furthermore, the use of only the three comparators 122A, 122B, 122D has the advantage compared to the receiver module 122 of Fig. 16 that, in the present embodiment, the receiver module 122 requires fewer

[0266] The semiconductor area required is greater than for the receiver module 122 of Fig. 16.

[0267] Fourth embodiment 5 According to a fourth embodiment, the transmitting

[0268] The receiving device 12, according to at least one of the preceding embodiments, is not put into a sleep mode. This is useful, for example, in bus systems 1, 1A, where, for safety reasons, the operation of the associated bus system 1, 1A must not normally be switched off.

[0269] Therefore, the transceiver 12 does not have a SLEEP operating mode on bus system 1. The transceiver 12 is thus not capable of wakeup. 5

[0270] Therefore, in such a transmit / receive device 12, the comparator 122D can be omitted. This also simplifies the circuit via the bias block 1222. All previously described configurations of the transmit / receive device 12, the subscriber stations 10, 20, 30, 50, the bus systems 1, 1A, the gateway 5, and the method executed in or by them according to the exemplary embodiments and their modifications can be used individually or in all possible combinations. In addition, the following modifications are particularly conceivable. The previously described bus systems 1, 1A according to at least one of the exemplary embodiments are described using a bus system based on the CAN protocol or 10BASE-T1 S. The bus systems 1, 1A

[0271] 5. According to the exemplary embodiments, however, another type of

[0272] It should be a communication network in which the signals are transmitted as differential signals.

[0273] The assignment of the reception thresholds to the comparators 122A, 122B for the evaluation of the signals from bus 40, 40A for the different

[0274] The communication standards supported by the transmit / receive device 12 are not limited to the preceding embodiments. For example, in the first embodiment, it is certainly possible that the receive thresholds T2_ETH, T3_ETH, and T1_ETH for evaluating the signals from bus 40A are assigned to comparators 122A, 122B, and 122C differently than previously described. In particular, comparator 122C can be configured to evaluate the receive threshold T3_ETH, and comparator 122B can be configured to evaluate the receive threshold T1_ETH. Of course, any other assignments are possible in the embodiments described above. However, this may increase the circuit complexity and thus also the space requirements and costs for the transmit / receive device 12.

[0275] It is advantageous, but not a necessary condition, that for at least one of the bus systems 1, 1A, exclusive, collision-free access of a participant station 10, 20, 30 to bus 40, 40A is guaranteed for certain periods of time.

[0276] The bus system 1, 1A according to at least one of the embodiments and 0 of their modifications is, in particular, a bus system in which communication between at least two of the participant stations 10, 20, 30, 50 is possible according to two different CAN standards, such as CAN-HS or CAN FD or CAN XL. Thus, the functionality of the previously described embodiment can be used, for example, with transmit / receive devices 12, 22 that are to be operated in such a bus system 1, 1A.

[0277] The number and arrangement of the participant stations 10, 20, 30, 50 in each of the bus systems 1 , 1 A according to at least one of the embodiments and their modifications is freely selectable.

Claims

Claims 5 1) Transmit / receive device (12) for a subscriber station (10; 30; 50) of a serial bus system (1 ; 1 A), with a first connection (TXD / TX) for receiving a transmit signal (TxD; Tx) from a communication control device (11 ; 11 A), a transmitter module (121) for sending the digital transmit signal (TxD; Tx) as an analog differential signal (CAN_H, CAN_L; LINE+, LINE-) to a bus (40; 40A) of the bus system (1 ; 1 A) in order to connect to at least one other subscriber station (10; 20; 30) of the bus system (1; 1 A) to send a message (45; 48), to a receiver module (122; 1220) for receiving signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) and for generating a digital receive signal (RxD; Rx) from the analog differential signal (CAN_H, CAN_L; LINE+, LINE-), to a second terminal (RXD / RX) for outputting the digital receive signal (RxD; Rx) to the communication control unit (11; 11 A), and to a COM-IF acquisition module (124) for evaluating the digital transmit signal (TxD; Tx) with respect to a Communication standard of two communication standards (CAN; 10BASE-T1 S), for which the transmit module (121) and the receive module (122; 1220) are designed for communication in the serial bus system (1; 1A), 0 wherein the receive module (122; 1220) has a first comparator (122A) for evaluating the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a first receive threshold (T1_CAN; T2_ETH), a second comparator (122B) for evaluating the signals 5 (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a second receive threshold (T2_CAN; T3_ETH), whose voltage value differs from a voltage value of the first receive threshold (T1_CAN; T2_ETH), and a receive threshold control block (1221) for controlling the 5. Voltage value of the first receive threshold (T1_CAN; T2_ETH) and the voltage value of the second receive threshold (T2_CAN; T3_ETH) based on the evaluation of the COM-IF acquisition module (124) to activate the receive module (122; 1220) to receive the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) and to generate the digital receive signal (RxD; Rx) according to the to set the communication standard of the two communication standards (CAN; 10BASE-T1 S) with which the transmit signal (TxD; Tx) was generated. 5 2) Transmit / receive device (12) according to claim 1, furthermore with a third connection (STB / ED) for setting one of two predetermined voltage levels (H1; LW), wherein the COM-IF detection module (124) is further configured to evaluate whether the digital transmit signal (TxD; Tx) at the first 0 connection (TXD / TX) in combination with a predetermined Voltage levels of the two predetermined voltage levels (Hl; LW) occur at the third connection (STB / ED). 3) Transmitting / receiving device (12) according to claim 1 or 2, wherein the second comparator (122B) has a larger bandwidth than the first Comparator (122A). 4) Transmitting / receiving device (12) according to one of the preceding claims, furthermore comprising a third comparator (122C) for evaluating the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a third receive threshold (T3_CAN; T1_ETH), whose voltage value differs from the voltage value of the first receive threshold (T1_CAN; T2_ETH) and the voltage value of the second receive threshold (T2_CAN; T3_ETH), and wherein the receive threshold control block (1221) is also designed to control the voltage value of the third receive threshold (T3_CAN; T1_ETH) based on the evaluation of the COM-IF acquisition module (124) in order to control the receive module (122; 5 1220) to receive the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) and to generate the digital receive signal (RxD; Rx) according to the communication standard of the two communication standards (CAN; 10BASE-T1 S) with which the transmit signal (TxD; Tx) was generated. 0 5) Transmit / receive device (12) according to claim 4, further comprising a fourth comparator (122D) for evaluating the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a fourth receive threshold (T4_CAN) whose voltage value differs at least from the voltage value of the second receive threshold (T2_CAN; T3_ETH) and the voltage value of the third receive threshold (T3_CAN; T1_ETH), and wherein the receive threshold control block (1221) is further configured to control the voltage value of the fourth receive threshold (T4_CAN) based on the evaluation of the COM-IF acquisition module (124) in order to enable the receive module (122; 1220) to receive the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) and to To set the generation of the digital receive signal (RxD; Rx) according to the communication standard of the two communication standards (CAN; 5 10BASE-T1 S) with which the transmit signal (TxD; Tx) was generated. 6) Transmitting / receiving device (12) according to claim 5, further comprising a bias block (1222) for supplying a zero bias current (l_B) to the first to fourth comparator (122A, 122B, 122C; 122D), wherein the bias block (1222) is configured to supply a lower bias current (l_B) to the fourth comparator (122D) than to the first to third comparators (122A, 122B, 122C). : 5 7) Transmitting / receiving device (12) according to one of the preceding claims, wherein the transmitting module (1 1) is configured to transmit the analog differential signals (CAN_H, ) in a communication standard (CAN XL) of the two communication standards (CAN; 10BASE-T1 S). 5 CAN_L) in a first communication phase (451) of the message (45) with a different Physical Layer (451_P) than in a second communication phase (452). 8) Transmitting / receiving device (12) according to claims 6 and 7, wherein the receiving module (1220) has three comparators comprising the first and second comparator (122A, 122B) and also the fourth comparator (122D), and wherein the receive threshold control block (1221) has a resistor circuit (1221A) for setting the voltage value of the first receive threshold (T1_CAN) for the first Comparator (122A) in the first communication phase (451) and for setting the voltage value of the third receive threshold (T3_CAN) for the first comparator (122A) in the second communication phase (452). 0 9) Transmitting / receiving device (12) according to one of the preceding claims, furthermore comprising an operating mode selection module (123) for selecting an operating mode of the transmitting module (121) and / or the receiving module (122) on the basis of an evaluation result 5 of the COM-IF acquisition module (124). 10) Transmitting / receiving device (12) according to claim 9, wherein the operating mode selection module (123) is configured to evaluate the transmit signal (TxD; Tx) at the first terminal (TXD / TX) and the voltage level at the third terminal (STB / ED) for the selection of the operating mode of the transmitting module (121) and / or the receiving module (122). 11) Transmitting / receiving device (12) according to one of the preceding 5 claims, wherein the receiving module (122) also includes a logic block (1223) features a logical combination of outputs from at least two comparators (122A, 122B; 122B, 122C) to generate the received signal (RxD; Rx). 5 12) Transmitting / receiving device (12) according to claim 11, wherein the The logic block (1223) is configured to execute the logical operation based on an operating mode selection signal (B_SW) generated by the operating mode selection module (123) according to claim 9 or 10. 13) Transmitting / receiving device (12) according to any of the preceding claims, wherein the two communication standards are CAN XL and 10BASE-T1 S. 5 14) Subscriber station (10; 30; 50) for a serial bus system (1 ; 1 A), comprising a transmit / receive device (12) according to one of the preceding claims, and a communication control device (11 ; 11 A) for controlling communication in the bus system (1 ; 1 A) and for generating the : 0 transmit signal (TxD, Tx), wherein the subscriber station (10; 30; 50) is configured for communication in a bus system (1 ; 1 A) in which at least temporarily exclusive, collision-free access of a subscriber station (10; 30; 50) to the bus (40; 40A) of the bus system (1 ; 1 A) is ensured. 5 15) Gateway (5) for forwarding messages (45; 46; 47; 48) between at least a first bus system (1) and a second bus system (1 A), with at least two transmit / receive devices (12) according to claim 0 of claims 1 to 13, wherein one of the at least two transmit / receive devices (12) of the gateway (5) is connected to the first bus system (1) and another of the at least two transmit / receive devices (12) is connected to the second bus system (1 A). 16) Method for communication with differential signals (CAN_H, CAN_L; LINE+, LINE-) in a serial bus system (1 ; 1 A), wherein the method is carried out with a transmit / receive device (12) for a subscriber station (10; 30; 50) of the bus system (1 ; 1 A), 5 comprising a transmit module (121), a receive module (122), a first port (TXD / TX), a second port (RXD / RX), and a COM-IF capture module (124), wherein the method comprises the steps, Receiving, at the first terminal (TXD / TX), a digital transmit signal (TxD; Tx) from a communication control device (11; 11A), wherein the transmit signal (TxD; Tx) is configured for transmission as an analog differential signal (CAN_H, CAN_L; LINE+, LINE-) to a bus (40; 40A) of the bus system (1; 1A) in order to send a message (45) to at least one other subscriber station (10; 20; 30; 50) of the bus system (1A), Evaluate, with the COM-IF acquisition module (124), the digital transmit signal (TxD; Tx) with respect to one of two communication standards (CAN; 10BASE-T1 S), for which the transmit module (121) and the receive module (122; 1220) are designed for communication in the serial bus system (1; 1A), switch the transmit / receive device (12) based on the evaluation of the COM-IF acquisition module (124) into one of the two communication standards (CAN; 10BASE-T1 S), receive, with the receive module (122), analog differential signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) to output a digital receive signal (RxD; Rx) according to the set communication standard to the communication control device (11). ; 11 A), : 0 where the receiving module (122; 1220) has a first comparator (122A) for evaluating the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a first receive threshold (T1_CAN;T2_ETH), a second comparator (122B) for evaluating the signals : 5 (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) with a second; a receive threshold (T2_CAN; T3_ETH), whose voltage value differs from a voltage value of the first receive threshold (T1_CAN; T2_ETH), and a receive threshold control block (1221) for controlling the voltage value of the first receive threshold (T1_CAN; T2_ETH) and the voltage value of the second receive threshold (T2_CAN; T3_ETH) based on the evaluation of the COM-IF acquisition module (124), in order to enable the receive module (122; 1220) to receive the signals (CAN_H, CAN_L; LINE+, LINE-) from the bus (40; 40A) and to generate the digital receive signal (RxD; Rx) according to the To set the communication standard of the two communication standards (CAN; 10BASE-T1 S) with which the transmit signal (TxD; Tx) was generated.

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