Abstract: A method and a control device for regulating a drive device includes an electric motor with a motor shaft and a converter for supplying power to the electric motor. To this end, measured values of measured variables, which characterize a power loss of the drive device, are detected and a converter output voltage is adjusted depending on the detected measured values in such a way that the power loss decreases.

Abstract: A bit sequence, which is contained in a signalling message and which is known to a network unit and to a communications terminal which receives the signalling message from the network unit, informs the communications terminal that a test value is contained in a signalling message. The test value received by the communications terminal is compared with a test value computed by the communications terminal, and the communications terminal defines a signalling message as being unmodified only in the event that the bit sequence contained in a signalling message has been received and the comparison of both test values yields a positive result.