| 摘要 |
PURPOSE:To avoid the malfunction at selection of one end matching transmission, by giving sufficiently greater resistor in comparison with the respective line impedance on the lines for each driving circuit. CONSTITUTION:A plurality of driving circuits DV1 and DV2 and a single reception circuit RV are provided. The reception circuit is connected to one of the driving circuits with selection and the matching termination of the delivery line is made only at the near end of the reception circuit. In this case, on each line of the circuits DV1 and DV2, and near the connection and selection means with the circuit RV, the resistor R' which has the resistance sufficiently greater in comparison with the respective line impedance and decreasing the voltage effect due to the leakage current of the drive circuits, is added. Thus, the malfunction due to line selection can be avoided. |
