Measuring device, measuring probe and method for operating the measuring device

The device and/or system has physical or electrochemical measuring probes (1) connected with transmitters (3) having a processor (MPt) via one or two signal wire lines (2) e.g. coaxial cable, and including a ground wire (23') and a signal wire (21') that is connected with memory units (MEM). An analog or digital measuring signal of the probe is unidirectionally controllable corresponding to a transfer protocol by the processor. The signal and bidirectional digital operating data are transferred between the probe and the transmitter via the signal wire and the lines. The one or two signal wire lines are connected with the signal wire, where the bidirectional digital operating data is read or written from or in the memory units. Independent claims are also included for the following: (1) a measuring probe e.g. physical or electrochemical measuring probe for a measuring device (2) a method of controlling a measuring device.