A diagnostic magnetic resonance apparatus has at least one component arranged inside a high-frequency shielded room, at least one other component arranged outside the high-frequency shielded room, and a control computer which is connected with the components via control lines. The control lines are constructed as a serial sensor/actuator bus comprising a first bus portion with electrical bus lines, and a second bus portion with optical bus lines. The optical bus lines are conducted into the high-frequency shielded room and are connected therein with the first component. The first bus portion is connected with the second bus portion via an electro-optical interface.