Abstract: A sensor device structurally not combined with an evaluation circuit, for detecting physical magnitudes is equipped with an answerback device, in the memory component of which are stored correction data (sensor identification and characteristic data). The answerback device is connected for the transmission of identification and characteristic data with the evaluation circuit by way of at least two of the lines normally utilized for the measured value transmission and/or the energy supply of the sensor device and by way of a further line serving the transmission of a clock signal and is activatable by the same. With the use of a further measurement line and by a special circuit of the answerback device, correction data can be read-in additionally into the same during a calibration.

Abstract: An arrangement provides for the wireless transmission of a measuring signal from a sensor to an evaluating unit by a pair of first electrical coils that are temporarily inductively coupled with one another. The sensor is supplied with energy by a second pair of electrical coils that are also temporarily inductively coupled with one another. The sensor includes a power supply circuit means for receiving a low-frequency energy signal from the second pair of electrical coils and supplies an energy signal to a transmitting oscillator means. The transmitting oscillator means responds to at least one measured physical quantity and provides a medium-frequency measurement signal to be transmitted over the first pair of electrical coils. When used in a tire pressure control system, this arrangement provides for a reliable transmission of signals over a relatively large transmission path without strict mounting tolerances, while complying with governmental regulations.