| 摘要 |
<p>PURPOSE:To achieve the simplification of the device by organizing the light signal of digital codes of respective phases and converting these to the 3 phase integral serial digital light signals in a repeating part. CONSTITUTION:A repeating part 60 is provided between coding parts 20a, 20b, 20c corresponding to respective phases installed in the field the information processing unit 4 in the premises and the electric quantities of lines and converted to the light sigals of 3 phase integral serial digital codes and are transmitted to the unit 4, in this repeating part 60. As a result, the transmission dicruits for transmission and reception of thses light signls become one and this makes in-premises transmission extremely simple. Even in the case of assigning sampling timings from a wire area control station 5 or the unit 4, only required is to provide one synchronizing oscillation circuit to the repeating part 60, thus the constitution may be simplified.</p> |
