| 摘要 |
PURPOSE:To detect an operating condition of switches and thus to simplify electrical wiring by a system wherein a resistance is connected to each switch to emphasize a current flowing, which is connected to common wire, and the confluent current is subjected to A/D conversion. CONSTITUTION:Switch blocks 13, 14 are connected to an active junction box 20 through connectors 11, 12. In this case, resistances Z<0>R-Z<n>R(OMEGA) are connected in series to switches S0-Sn, and the set of switch and resistance is all connected in parallel. The box 20 is provided inside with a current-voltage transducer 21 to generate a voltage E proportional to a current i, a conversion circuit 22 having a function to store digital data through and after A/D conversion and a driving circuit 23 to drive loads L0-Ln according to the output. Where a switch S is closed, a bit of Z<n> comes in ''1'', the conversion data of which is stored in a memory storage, and the load L0 is driven according to the content. |
