| 摘要 |
A communication system between remote locations connected by a common wire conductor where AC power (40) is supplied from one location to one or more remote locations (32, 34). At the remote locations, inductor coil components (28, 32 and 30, 34) provide power to an instrument (24, 26). The AC power is modulated with surface selected discrete frequencies (56) to operate a specific selected remote location. At the selected remote location (24), the AC power is rectified and a logic processor detects the discrete frequencies for that location and operates the instrument. Data from the instrument is translated by current modulation (60) which is demodulated at the one location (50, 64, 66, 68, 70).
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