| 摘要 |
PURPOSE:To facilitate a future change of a connecting position by performing magnetically the connection to a bus, and connecting plural receivers to the pair lines for bus with no breakdown contactlessly. CONSTITUTION:When the current flowing to the pair lines for bus is set in the prescribed direction, the line of magnetic force is produced to a closed magnetic line of a connecting part 20. Then the magnetic force produces the electromagnetic force to a coil 23 wound round an EI type core. At the same time, the counterclockwise magnetic force is generated at the part 20, and the magnetic force is turned in the same direction at the center part of the core where the coil 23 is wound. Therefore, the electromotive force generated at the coil 23 is redoubled, and the signals produced by this electromotive force are sent to a sense amplifying part 26. At the part 26 a faint signal detected at the part 20 is received by a differential amplifier 27 with high impedance and amplified up to a proper amplitude with a low level of noise. |
