A control unit (1, 1', 1", 300) for a mobile sanitary device, in particular for a rail vehicle, comprising a vacuum toilet, a flush button, a voltage supply, a control device, and the control unit (1, 1', 1", 300), wherein the control unit (1, 1', 1", 300) includes: - a circuit board for carrying predefined signals, which has a standard interface, the standard interface including o a vacuum toilet connection means (10, 312) for connecting a vacuum toilet, o a flush button connection means (12, 314) for connecting a flush button, o a voltage supply connection means (14, 316) for connecting a voltage supply, wherein the vacuum toilet connection means (10, 312), the flush button connection means (12, 314) and the voltage supply connection means (14, 316) are conductively coupled to one another, and wherein o at least one signal carried by the circuit board can be tapped, processed and/or activated by the control device; characterized in that - the control unit further comprises a configuration circuit board for carrying signals, the configuration circuit board comprising a configuration interface (44, 351) having a first configuration connection means (45, 352) conductively coupled to the vacuum toilet connection means (10, 312), the flush button connection means (12, 314) and the voltage supply connection means (14, 316), - the configuration interface (44, 351) being arranged such that the configuration circuit board can be coupled to the control device. - a circuit board for carrying predefined signals, which has a standard interface, the standard interface including o a vacuum toilet connection means (10, 312) for connecting a vacuum toilet, o a flush button connection means (12, 314) for connecting a flush button, o a voltage supply connection means (14, 316) for connecting a voltage supply, wherein the vacuum toilet connection means (10, 312), the flush button connection means (12, 314) and the voltage supply connection means (14, 316) are conductively coupled to one another, and wherein o at least one signal carried by the circuit board can be tapped, processed and/or activated by the control device; characterized in that o a vacuum toilet connection means (10, 312) for connecting a vacuum toilet, o a flush button connection means (12, 314) for connecting a flush button, o a voltage supply connection means (14, 316) for connecting a voltage supply, wherein the vacuum toilet connection means (10, 312), the flush button connection means (12, 314) and the voltage supply connection means (14, 316) are conductively coupled to one another, and wherein o at least one signal carried by the circuit board can be tapped, processed and/or activated by the control device; characterized in that - the control unit further comprises a configuration circuit board for carrying signals, the configuration circuit board comprising a configuration interface (44, 351) having a first configuration connection means (45, 352) conductively coupled to the vacuum toilet connection means (10, 312), the flush button connection means (12, 314) and the voltage supply connection means (14, 316), - the configuration interface (44, 351) being arranged such that the configuration circuit board can be coupled to the control device.