Abstract: The invention relates to a data bus comprising slave nodes executing functions based on addressed command telegrams of an electronic main control unit which is also connected to said data bus. The command telegrams contain an identification field for addressing the commands whereby a reduced number of identification data is provided for said identification field. All functions which can be executed by the form of slave nodes on the data bus are respectively associated with at least one function number. Each slave node comprises a first non-volatile memory area, wherein the function numbers of the functions, which can be executed by a respective slave node are securely stored. Each slave node comprises a second programmable memory area, wherein identification information provided for the identification field can be stored associated with each function number stored by means of a special command telegram from the electronic main control unit to each function number stored in the first memory area.

Abstract: A control unit has a main microprocessor and processor interface to a bus transceiving unit, which has at least one transmit memory, one receive memory and one bus controller. Devices are provided by which the data content of the transmit memory and/or of the receive memory is reset to a defined status after each output and/or reading-in of the data stored in either memory, and before the main microprocessor outputs and/or reads in new data.

Abstract: The invention relates to a data bus comprising slave nodes executing functions based on addressed command telegrams of an electronic main control unit which is also connected to said data bus. The command telegrams contain an identification field for addressing the commands whereby a reduced number of identification data is provided for said identification field. All functions which can be executed by the form of slave nodes on the data bus are respectively associated with at least one function number. Each slave node comprises a first non-volatile memory area, wherein the function numbers of the functions, which can be executed by a respective slave node are securely stored. Each slave node comprises a second programmable memory area, wherein identification information provided for the identification field can be stored associated with each function number stored by means of a special command telegram from the electronic main control unit to each function number stored in the first memory area.

Abstract: A control unit has a main microprocessor and processor interface to a bus transceiving unit, which has at least one transmit memory, one receive memory and one bus controller. Devices are provided by which the data content of the transmit memory and/or of the receive memory is reset to a defined status after each output and/or reading-in of the data stored in either memory, and before the main microprocessor outputs and/or reads in new data.