Control variables - transmitter with:Compounds which, with an additional consumer is brought into engagement, and may be dissolved, wherein the compounds a bus - contact and have a common contact;a transmitter circuit, the one hand, with the common contact, which is coupled to the common conductor, a supply conductor and a serial input and a serial output has;a receiver circuit, which with the serial input and by a serial bus with the bus - contact is coupled;a supply limiter - circuit, which removes a supply current, of a supply conductor and an output of the stored energy, the supply limiter - circuit provides a supply current - limiting;a recessive driver circuit, which a driving current from the output of the stored energy and removes the driver current with the serial bus couples, wherein the recessive driver circuit provides a driver current - limit; anda dominant driver circuit, which between the serial output is coupled, and the serial bus; wherein the dominant driver circuit is a dominant state, in which they the driver current to a common conductor, and an inactive state has, in which the driver current is available for an additional consumer.
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