| 摘要 |
PURPOSE:To realize the input operation through just a single one of plural input devices connected to each other by making use of the changes of the power supply voltages in both connection and non-connection states of those input devices. CONSTITUTION:The resistances RL, R, R1 and R2 and the constant of the supply voltage E are set properly, therefore the logic of an AND gate is unsatisfied while a power supply switch SW1 is kept turned on. Then the output of the gate 7 is set under to '0' state of the TTL level and a data signal S001 for input device is not sent to the second monitor display device 8 nor to an input device 9. While the output of the gate 7 is sent to only an input device 3 connected to a monitor display device 2. Thus the input operation is possible through the device 3 only. When the switch SW1 is kept off, the signal S001 is sent to the device 8 and the device 9 from the gate 7. Then the input operation is possible through the device 9. In such a constitution, the input operation is possible through a specific one of plural input devices connected to each other. Thus these input devices can be easily controlled.
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