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专利名称：A device for transmitting digital information
via a long distance transmission medium
发明人：Ek, Claes Wilhelm申请号：EP87850145.1申请日：19870430公开号：EP0244386A3公开日：190830
专利附图：
摘要：A device for transmission of measured data in unmodulated form from anumber of measuring units to a centre or between the measuring units. The transmissionmedium 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 voltagesources (D1, D2, C) are formed along the cable (KK) by feeding from for instance thecentral unit. The information in unmodulated form between the measuring units orbetween a measuring unit and the central unit is transmitted by connecting anddisconnecting (S1, S2) the local voltage sources alternately and in dependence on theinformation to be transmitted. A galvanic isolation from the measuring units and lowerdistorsion in the transmission are obtained.
申请人：UPEC ELEKTRONIK AB
地址：Sjöängsvägen 1 C S-191 72 Sollentuna SE
国籍：SE
代理机构：Onn, Thorsten
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