A galvanically isolating interface for the transmission of electrical energy and data packets, comprising: - A coil arrangement with at least one primary coil and at least one secondary coil, wherein the coil arrangement is configured in such a way that the primary coil and the at least first secondary coil are inductively coupled to one another and galvanically decoupled from one another, - a switching unit which is configured in such a way ∘ that the primary coil can be connected to and disconnected from a supply voltage or can be disconnected from ground so that there is no electrical connection between the supply voltage and ground via the primary coil, and ∘ that the polarity of the supply voltage at the primary coil can be reversed, - a control unit (3, 4, 5) which is configured to control the switching unit in such a way ∘ that the polarity of the primary coil is reversed at a defined cycle rate, which is selected as a function of a defined serial transmission standard so that a corresponding AC voltage signal is induced in the secondary coil, ∘ that the primary coil is disconnected from the supply voltage or from ground for a defined dead time before or after each polarity reversal per cycle, and ∘ that an electrical pulse is generated in the coil arrangement on the primary side in the dead times of each cycle, which correspond to a data packet from the transmission standard, - a rectifier which is configured to rectify the AC voltage signal induced in the first secondary coil and to provide it as energy, and - an evaluation unit (9, 13) which is configured to detect the pulses generated on the primary side in the coil arrangement in accordance with the transmission standard via the first secondary coil as the data packet to be transmitted. - A coil arrangement with at least one primary coil and at least one secondary coil, wherein the coil arrangement is configured in such a way that the primary coil and the at least first secondary coil are inductively coupled to one another and galvanically decoupled from one another, - a switching unit which is configured in such a way ∘ that the primary coil can be connected to and disconnected from a supply voltage or can be disconnected from ground so that there is no electrical connection between the supply voltage and ground via the primary coil, and ∘ that the polarity of the supply voltage at the primary coil can be reversed, ∘ that the primary coil can be connected to and disconnected from a supply voltage or can be disconnected from ground so that there is no electrical connection between the supply voltage and ground via the primary coil, and ∘ that the polarity of the supply voltage at the primary coil can be reversed, - a control unit (3, 4, 5) which is configured to control the switching unit in such a way ∘ that the polarity of the primary coil is reversed at a defined cycle rate, which is selected as a function of a defined serial transmission standard so that a corresponding AC voltage signal is induced in the secondary coil, ∘ that the primary coil is disconnected from the supply voltage or from ground for a defined dead time before or after each polarity reversal per cycle, and ∘ that an electrical pulse is generated in the coil arrangement on the primary side in the dead times of each cycle, which correspond to a data packet from the transmission standard, ∘ that the polarity of the primary coil is reversed at a defined cycle rate, which is selected as a function of a defined serial transmission standard so that a corresponding AC voltage signal is induced in the secondary coil, ∘ that the primary coil is disconnected from the supply voltage or from ground for a defined dead time before or after each polarity reversal per cycle, and ∘ that an electrical pulse is generated in the coil arrangement on the primary side in the dead times of each cycle, which correspond to a data packet from the transmission standard, - a rectifier which is configured to rectify the AC voltage signal induced in the first secondary coil and to provide it as energy, and - an evaluation unit (9, 13) which is configured to detect the pulses generated on the primary side in the coil arrangement in accordance with the transmission standard via the first secondary coil as the data packet to be transmitted.