Robert Boschgmbh

Christian Horst

Florian Hartwich

Franz Bailer

Arthur Mutter

Andreas Mueller

Markus Ihle

Martin Heinebrodt

Timo Lothspeich

Tobias Lorenz

Ralf Machauer

Carsten Gebauer

Thorsten Huck

Thomas Wagner

Bjoern Kasper

Thorsten Schwepp

Thomas Keller

Frank Voetz

Thomas Lindenkreuz

Stefan Thiele

Peter Svejkovsky

Marc Schreier

Christian Senger

Peter Svejkovsy

A subscriber station for a serial bus system. The subscriber station has a communication control device for controlling a communication of the subscriber station with at least one other subscriber station of the bus system. The communication control device generates a transmit signal according to a frame and inserts a field having an edge into the frame after a second communication phase. The field has, before the edge, a predetermined length corresponding to a time period that is longer than the time period of a bit time of a first communication phase. The edge is provided for synchronization to the communication on the bus for a communication control device of the at least one other subscriber station of the bus system whose transceiver device is switched, before the predetermined time period, into an operating mode for transmitting and receiving the frame in the first communication phase.

Subscriber station for a serial bus system, and method for communication in a serial bus system

An error detection test device for a subscriber station of a serial bus system. The error detection test device has an evaluation module for evaluating which bit of a signal must be interrupted so that the receivers of the resulting signal in which the at least one bit is interrupted can check the function of an error detection mechanism, the signal being processed by a protocol control unit while the subscriber station is in operation in order to be able to be transmitted as a frame onto a bus of the bus system or, after a frame has been received from the bus, to decode the signal from the frame, and an output terminal for outputting a switching signal to the protocol control unit to interrupt the at least one bit. The evaluation module generates the switching signal based on the at least one bit evaluated by the evaluation module.

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

A user station for a serial bus system. The user station includes a communication control device for controlling a communication of the user station with at least one other user station, and a transceiver device to serially transmit a transmission signal generated by the communication control device onto a bus and to serially receive signals from the bus. The communication control device generates the transmission signal according to a frame, and inserts a header check sum into the frame, only bits of a frame header that is situated in front of a data field provided for useful data in the frame being included in the computation. For computing the header check sum, the communication control device uses a predetermined starting value and a predetermined check sum polynomial.

User station for a serial bus system, and method for communicating in a serial bus system

A user station for a serial bus system and a method for communication in a serial bus system. The user station includes an application for carrying out a task, a transceiver unit for serially receiving a message in the form of a frame from a bus of the bus system, via which user stations of the bus system exchange messages with one another, and a filter module for filtering the received frame. The filter module for filtering is designed to check at least two segments of the frame separately to determine whether or not the received frame is to be passed on to the application.

User station for a serial bus system and method for communication in a serial bus system

A timestamp unit and a communication control unit for a user station. The timestamp unit includes a memory, which cyclically stores a timestamp of a message, which is transmitted via a communication network, an address counter, which is incrementable with each storing of a timestamp of a message, so that the value of the address counter corresponds to an address at which the timestamp is stored in the memory, a first interface to a host control unit via which the timestamp of a message is capturable, and a second interface to a communication control unit, which creates or reads at least one message for/from the user station, the interface including a connection for receiving a trigger signal from the communication control unit, which prompts the capturing of a timestamp, and a connection for transmitting a signal to the communication control unit, which includes the value of the address counter.

Timestamp unit and communication control unit for a user station of a communication network

The disclosure relates to a method for serially transmitting a frame from a transmitter to at least one receiver by means of a bus line, as well as a subscriber station for a bus system. According to said method, stuff bits are inserted into the frame by the transmitter according to a predetermined rule in order to generate additional signal edges, and/or said stuff bits are removed again by the receiver when evaluating the frame, at least one item of information relating to a subsection of the frame additionally being added, and transmitted, outside of this subsection, and said subsection containing a predetermined sequence of bit values.

Method for serially transmitting a frame from a transmitter to at least one receiver by means of a bus system, and a subscriber station for a bus system

The disclosure relates to a method for serially transmitting a frame from a transmitter to at least one receiver via a bus line, as well as a subscriber station for a bus system. According to said method, stuff bits for generating additional signal edges are inserted into the frame by the transmitter according to a predetermined rule, and the stuff bits are removed again by the receiver when evaluating a received frame, a CRC calculation logic of a CRC generator calculating a CRC checksum that is comprised by said frame, and a value of '1' being inserted into said CRC calculation logic in an additional evaluation step if a value of '0 . . . 0' has been determined for the CRC checksum in the running calculation executed by the CRC calculation logic.

Method for serially transmitting a frame from a transmitter to at least one receiver via a bus system, and a subscriber station for a bus system

A user station for a bus system and a method for checking the correctness of a message, in which the user station includes a communication control unit for writing or reading at least one message for/from at least one further user station of the bus system, in which an exclusive, collision-free access by a user station to a bus line of the bus system is ensured at least intermittently, a checksum generator for generating a checksum for the message to detect bit errors in the message, and a configuration register for specifying the initialization value with which the checksum generator is to be preloaded to start the message, the initialization value being changeable as necessary even following a communication with the communication control unit.

User station for a bus system, and method for checking the correctness of a message

A method is described for checking the correct functioning of a serial data transmission in a bus system having at least two bus users. The bus users are connected to the bus via a bus connection unit and exchange messages via the bus. The sending access to the bus for each message is granted to a bus user via the arbitration process according to CAN standard ISO 11898-1, this bus user becoming the sender for this message. The messages have a logic structure according to the CAN standard, i.e., are composed of a start of frame bit, arbitration field, control field, data field, CRC field, acknowledge field, and end of frame field. The correct functioning of the data transmission is checked during the transmission by comparing a transmission signal, sent to the bus connection unit, to the reception signal (CAN_RX) received by the bus connection unit. The method is characterized in that a transmission signal (CAN_TX_DEL), which is delayed by a delay time (T_DELAY) compared to the transmission signal (CAN_TX), is held in the sender, and the undelayed transmission signal (CAN_TX) or the delayed transmission signal (CAN_TX_DEL) is used for checking the correct functioning of the data transmission, as a function of a switchover.

Method and device for checking the correct functioning of a serial data transmission

A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the transmitted messages having a CAN standard ISO 11898-1 structure, where for a first marker (EDL), the control field of the messages, divergently from ISO 11898-1, encompasses more than 6 bits, and for the EDL, the data field of the messages, divergently from ISO 11898-1, may encompass more than 8 bytes, the values of the 4 bits of the data length code being interpreted divergently from ISO 11898-1 to establish the data field size, and for a second marker (BRS), the bit length for at least one predefined or predefinable region within the message assumes a value that is shortened as to the bit length used before the second marker was present, the region beginning at the earliest with the second marker and ending at the latest with the CRC delimiter, and the BRS occurring only when the EDL is present, and occurring in the control field of the messages which encompasses more than 6 bits.

Method and device for serial data transmission having a flexible message size and a variable bit length

A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the transmitted messages having a logical structure according to CAN standard ISO 11898-1, the logical structure encompassing a start of frame bit, arbitration field, control field, data field, CRC field, acknowledge field, and end of frame sequence, the control field encompassing a data length code that contains an information item regarding the length of the data field. The method is characterized in that when a first marker (EDL) is present, the control field of the messages, divergently from ISO 11898-1, encompasses more than six bits; the first marker (EDL) being implemented by way of a recessive bit in the control field, and when the first marker is present, the recessive bit of the first marker (EDL) being followed, in all data messages, by at least one dominant bit.

A method for serial data transfer in a bus system having at least two bus subscribers that exchange messages via the bus, the transmitted messages having a logical structure according to CAN standard ISO 11898-1, the logical structure encompassing a start-of-frame bit, arbitration field, control field, data field, CRC field, acknowledge field, and end-of-frame sequence, the control field encompassing a data length code having an information item regarding the data field length. When a first marker (EDL) is present, the control field of the messages, divergently from the CAN standard ISO 11898-1, encompasses more than six bits; when the first marker (EDL) is present, the control field of the message is expanded to include at least one further bit (ESI); and the further bit (ESI) or one of the further bits causes an information item regarding the 'error passive' state of the bus subscriber to be integrated into transmitted messages.

In a method for exchanging data in messages between users of a CAN bus system, the users have their own time bases; a first user functioning as timer transmits a reference message having a specifiable identifier via the bus, which includes a first time information with regard to the time base of the first user; the at least second user, using its time base forms its own second time information as a function of the first time information of the first user in such a way that, from the deviation of the first and the second time information a correction value is ascertained, so that from the first time information of the first user as the timer, the global time for the bus system is yielded.

Device and method for global time information in event-controlled bus communication

A method and a device is provided to allow additional data to be transmitted between at least two users of a bus system. The transmitted data frames have a logic structure according to the CAN standard ISO 11898-1, and at least two additional short bits are inserted within a temporal bit length of at least some of the CAN bits such that at least for one of the two possible values of the current CAN bit, the first one of the additional bits inserted into this CAN bit is transmitted using a bus level that is the opposite of this value.

Method and device for a serial data transmission with additionally inserted data

A user station of a bus system includes: a counter for counting each message which is sent without error and/or each message which is received without error, the counter being incremented when a message is sent without error and/or a message is received without error, and a reset device for resetting the counter reading of the counter when the counter reading of the counter is read.

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Dusslingen, Germany

Christian Horst