Abstract: A method for operating a camera system including a camera head and a control unit, which are connected to one another by means of a high-frequency channel. The method includes: detecting at least one physical parameter in the camera head and outputting it as a first signal using a detector unit; converting the first signal into a low-frequency signal within a carrier frequency range using a carrier frequency modulator; transmitting the low-frequency signal to the control unit by means of a first passive coupler via the high-frequency channel; receiving the low-frequency signal using a second passive coupler in the control unit; demodulating the low-frequency signal using an envelope detector; comparing the demodulated signal with at least one reference value using a threshold circuit in order to obtain a comparison result; and outputting a control signal according to the comparison result.