| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that processing loads of a host computer 5 can not be reduced because the host computer 5 requires the same communication processing, etc., as the one when a device 1 is actually used, even when the host computer 5 actually does not use the device 1 as long as the device 1 is physically connected to the host computer 5. SOLUTION: When a CPU 14 makes setting in which a device 11 is used, a pull-up power source 20 is electrically connected to a pull-up resistor 21, and when the CPU 14 makes setting in which the device 11 is not used, the pull-up power source 20 is electrically disconnected to the pull-up resistor 21. COPYRIGHT: (C)2009,JPO&INPIT
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