A fill level measurement system, comprising: a fill level measuring device (3, 14); and a control unit (1, 13) coupled to the fill level measuring device via a communication interface; wherein the fill level measuring device is configured to: - determine whether a current measured value, recorded by the fill level measuring device in a measurement, differs from a measured value recorded in a measurement preceding said measurement; or - determine whether a current item of diagnostic information generated by the fill level measuring device, differs from an item of diagnostic information preceding said item of diagnostic information; or - determine whether a current device parameter has changed due to a change in a further device parameter; wherein the fill level measuring device (3, 14) is further configured to record in a flag when it has determined that the current measured value, the current item of diagnostic information or the current device parameter has changed; wherein the control unit is configured to: - retrieve and check the flag; - upon checking the flag, decide whether or not the current measured value, the current item of diagnostic information or the current device parameter is to be retrieved; and - retrieve the current measured value, the current item of diagnostic information or the current device parameter of the fill level measuring device only if the fill level measuring device has determined a difference between the measured values or between the items of diagnostic information or a change in the device parameter. a fill level measuring device (3, 14); and a control unit (1, 13) coupled to the fill level measuring device via a communication interface; wherein the fill level measuring device is configured to: - determine whether a current measured value, recorded by the fill level measuring device in a measurement, differs from a measured value recorded in a measurement preceding said measurement; or - determine whether a current item of diagnostic information generated by the fill level measuring device, differs from an item of diagnostic information preceding said item of diagnostic information; or - determine whether a current device parameter has changed due to a change in a further device parameter; wherein the fill level measuring device (3, 14) is further configured to record in a flag when it has determined that the current measured value, the current item of diagnostic information or the current device parameter has changed; - determine whether a current measured value, recorded by the fill level measuring device in a measurement, differs from a measured value recorded in a measurement preceding said measurement; or - determine whether a current item of diagnostic information generated by the fill level measuring device, differs from an item of diagnostic information preceding said item of diagnostic information; or - determine whether a current device parameter has changed due to a change in a further device parameter; wherein the fill level measuring device (3, 14) is further configured to record in a flag when it has determined that the current measured value, the current item of diagnostic information or the current device parameter has changed; wherein the control unit is configured to: - retrieve and check the flag; - upon checking the flag, decide whether or not the current measured value, the current item of diagnostic information or the current device parameter is to be retrieved; and - retrieve the current measured value, the current item of diagnostic information or the current device parameter of the fill level measuring device only if the fill level measuring device has determined a difference between the measured values or between the items of diagnostic information or a change in the device parameter. - retrieve and check the flag; - upon checking the flag, decide whether or not the current measured value, the current item of diagnostic information or the current device parameter is to be retrieved; and - retrieve the current measured value, the current item of diagnostic information or the current device parameter of the fill level measuring device only if the fill level measuring device has determined a difference between the measured values or between the items of diagnostic information or a change in the device parameter.