| 摘要 |
A device for transmission of measured data in unmodulated form from a number of measuring units to a centre or between the measuring units. The transmission medium between the central unit (CE) and the different measuring units (KE1-KEn) consists of a cable with two phases (f1, f2) and a return conductor (r). Local voltage source (D1, D2, C) are formed along the cable (KK) by feeding from for instance the central unit. The information in unmodulated form between the measuring units or between a measuring unit and the central unit is transmitted by connecting and disconnecting (S1, S2) the local voltage sources alternately and in dependence on the information to be transmitted. A galvanic isolation from the measuring units and lower distorsion in the transmission are obtained. |
