Abstract: In a measuring system, a measuring signal is transmitted on a two-wire line by varying the DC supply current which is transmitted on the same two-wire line. In addition, binary-coded information signals are transmitted via the same two-wire line, each bit of the one binary value being represented by a group of a predetermined number of consecutive periods of a periodic signal, and each bit of the other binary value being represented by the absence of the same number of consecutive periods of the periodic signal. On reception, received periods of the periodic signals are counted in a first counting direction and missing periods are counted in the opposite counting direction between two limit counts. Reception of the one binary value is indicated when the first limit count is reached, and reception of the other binary value is indicated when the second limit count is reached.