Abstract: For a minimal electromagnetic radiation during transition between its states, a transmitter for a two-wire, differential databus on which a dominant state can be impressed by means of the transmitter in an active state of the transmitter, and which is in a recessive state when all transmitters connected to the databus are in a passive state, is characterized in that the transmitter is provided with a capacitance (6) and switching means (7, 8, 9, 10) by means of which the capacitance (6) can be alternatively coupled to an electric source (11) or between the two databus lines (1, 2), and in that the switching means (7, 8, 9, 10) charge the capacitance (6) by means of the electric source (11) during periods when the transmitter is in a passive state, and couple the capacitance (6) between the two databus lines (1, 2) during periods when the transmitter is in an active state.

Abstract: A data bus for serial bus transmission between apparatus which are capable of transmitting and/or receiving data via the data bus, recessive and dominant states being present on the data bus and each state being assigned a respective bit value. In order to interrupt a message of low priority by a message of higher priority without incurring a time delay and without additional channels being required, messages are transmitted in message blocks, each message block having at its beginning a start block with (n+k) dominant and j subsequent recessive bits and subsequent data blocks with n data bits and m subsequent recessive bits. A message block of low priority currently being transmitted can be interrupted by another apparatus in order to transmit a message block of higher priority in that the other apparatus generates a new start block on the data bus and subsequently transmits the associated data blocks.

Abstract: An arrangement for controlling at least one predetermined function, which can be transmitted from at least one transmission apparatus (1) to a receiving apparatus (11) via a serial data bus, is protected against unintentional triggering of the predetermined function in that in order to control a predetermined function the transmission apparatus (1) dispatches an associated, predetermined data message on the serial data bus (7) and adjusts a transmission parameter of the data bus to a predetermined value, and in that the receiving apparatus (11) triggers the predetermined function only if the predetermined data message appears on the data bus (7) with the predetermined transmission parameter.