Provided are a communication system and a communication device that allow a reception node to estimate delay time, a generation time point or the like of a message. A delay time estimation part in an ECU determines whether a message received by itself is transmitted in sequence with another message without being provided with time information by a transmission node. If the received message is transmitted in sequence with another message, the received message may be delayed due to arbitrary processing. Thus, the delay time estimation part checks the priority of one or more sequential messages preceding the received message, and estimates delay time of the received message occurring due to the arbitrary processing in accordance with the priority of each message. A generation time point estimation part estimates the time point when the received message is generated by an ECU, based on the delay time estimated.

Provided are a communication control device and a communication system capable of detecting message transmission in the case where an invalid device transmits a message to a common communication line. A monitoring device decides a reference time point t0 for periodical message transmission by an ECU, decides multiple scheduled transmission time points t1, t2, . . . obtained by adding a period corresponding to an integer multiple of a transmission cycle T of a message to the reference time point t0, and decides that a predetermined period including each of the scheduled transmission time points is a permission period for message transmission. The monitoring device determines whether or not a detected message on a CAN bus has been transmitted during the permission period. If determined that transmission of an invalid message is not permitted, the monitoring device performs processing of causing the ECU which receives the message to discard the message.

A user station for a serial bus system and a method for communication in a serial bus system. The user station includes a communication control unit, and a transceiver unit for transmitting a transmit signal for a message which is exchanged between user stations of the bus system. The bit time of a signal transmitted in the first communication phase on the bus differs from a bit time of a signal transmitted in the second communication phase. The communication control unit generates the transmit signal according to a frame, in which in addition to a field which indicates the priority of the message, a field for a data type is provided, and the communication control unit being designed to write a value in the field for the data type which indicates which type of information is located in a data field of the frame.

In an automation communication network, a distribution node is provided with a plurality of input/output interfaces, each connected to a network segment having at least one subscriber. The network segments are each assigned segment telegrams for processing by the subscriber. The segment telegrams have a data field with sequence information indicating the priority of a subsequent segment telegram. The distribution node is configured to receive the segment telegram on an input/output interface and transmit it according to a routing specification on a further input/output interface. The distribution node blocks the input/output interface on which the segment telegram has been transmitted for further transmission if the telegram sequence information indicates a priority for the subsequent segment telegram with the same routing specification, which is higher than the priority of other telegrams intended for transmission on the input/output interface, in order to send the subsequent segment telegram on the blocked input/output interface.

The invention relates to a method for transmitting data via a communications channel (106), in which the data is transmitted with a transmission frame, wherein the transmission frame has at least one prioritisation field (PCP) for establishing the priority of the message and a data field, wherein the prioritisation field (PCP) functions to control the bus access by prioritising the messages. For this purpose, a bus access controller is used, in which the priority of at least the last received data packet is stored in a minimum priority storage cell (330). After receiving a data packet, a timer (320) is started, for which a timeout value is set, which is reset when a following packet is received. After reaching the timeout value, a decrementing of the value stored in the minimum priority storage cell (330) occurs. Thereafter, for the purpose of bus access control, when sending a packet, it is checked whether the priority of the packet to be sent is lower than the value stored in the minimum priority storage cell (330), and the sending of the data packet is prevented if the priority of the packet is lower than the value stored in the minimum priority storage cell (330).

A relay device connected to an in-vehicle network includes a first determination unit; a second determination unit; and a relay processing unit. The first determination unit is configured to send out a high priority transfer message through a first path that runs from the first determination unit to the relay processing unit without passing through the second determination unit. The relay processing unit is configured to output the high priority transfer message, acquired through the first path, to the second determination unit and the in-vehicle device. The first determination unit is configured to send out a normal priority transfer message to the relay processing unit through a second path that runs from the first determination unit to the relay processing unit via the second determination unit. The relay processing unit is configured to output the normal priority transfer message, acquired through the second path, to the in-vehicle device.

A user station for a serial bus system and a method for communication in a serial bus system. The user station includes a communication control unit, and a transceiver unit for transmitting a transmit signal for a message which is exchanged between user stations of the bus system. The bit time of a signal transmitted in the first communication phase on the bus differs from a bit time of a signal transmitted in the second communication phase. The communication control unit generates the transmit signal according to a frame, in which in addition to a field which indicates the priority of the message, a field for a data type is provided, and the communication control unit being designed to write a value in the field for the data type which indicates which type of information is located in a data field of the frame.

A mobile power source includes an electrical generator, a controller, a resistor, and a user-activated switch positioned on a control panel of the electrical generator, the user-activated switch is configured to move between at least a first position and a second position. In response to the user-activated switch being in the first position, the resistor is configured to act as a terminating resistor at one end of a controller area network (CAN) bus of a power generation system, and in response to the user-activated switch being in the second position, the resistor is configured to be prevented from acting as the terminating resistor of the CAN bus.

A method of communication in a vehicle network is provided. An example method includes transmitting a network allocation map in a TDMA cycle, indicating reservation of time slots in the TDMA cycle. The method further includes transmitting a synchronization signal in the TDMA cycle, to synchronize the timing of nodes in the vehicle network. Each of the reserved time slots is identified by at least a network ID of a transmitting node in the vehicle network, and a slot type comprising one of a low latency traffic slot, and a bulk traffic slot. Further, the low latency traffic slots are repeated in the TDMA cycle at least as frequently as a guaranteed QoS latency parameter. Further, the bulk traffic slots are at least as long as a guaranteed QoS throughput parameter.

A method for processing process data by means of data bus subscribers of a local bus, the method including: receiving at least one instruction list at a data bus subscriber, the instruction list having a set of instructions for processing process data, storing the at least one instruction list in a memory, receiving an instruction list index, ILI, at the data bus subscriber, selecting one of the at least one stored instruction list on the basis of the received ILI if the ILI is associated with the stored instruction list, and executing the set of instructions of the selected instruction list in order to process the process data by means of the data bus subscriber. The local bus is designed as a ring bus, for example. Each output of a data bus subscriber is connected, for example, to an actuator.