Field devices for measuring a pressure or a fill level are connected, by way of a cable connection or a radio connection, to stationary evaluation- and display devices. To provide flexible parameterisation or flexible measured-value inquiry, a connection box for the wireless transmission of signals between the field device and the control device is stated, which connection box comprises an interface connection and a radio interface. For the purpose of transmitting the signals, the interface connection and the radio interface are coupled to each other so as to be able to communicate.