| 摘要 |
<p>PURPOSE: To surely make the presence or absence of vehicles intensive at a place at low cost by using a common coaxial line many times and using a frequency for the recognition for every vehicle. CONSTITUTION: A vehicle presence or absence detection part 3 is provided per vehicle, near the lower part of the vehicle, for instance, of the place in the vicinity of each vehicle 2 within a parking lot. Next, a detection line axial line 1 is provided for every tens of vehicles, the outputs from the vehicle presence or absence detection part 3 are made intensive, the outputs are collected at the control office of a parking lot, etc., and the line is connected with a detection line switching device 6. The detection line switching device 6 is connected with the interface of a personal computer 5 and the one detection line axial line 1 is made to be selected from plural detection line axial lines 1 by the instruction of the personal computer 5. Next, the detection line selected by the detection line switching device 6 is inputted in a reception part 7. This reception part 7 is connected by the I/O of the personal computer 5 and the presence or absence of the frequency designated by the instruction of the personal computer 5 is made to be successively outputted to the personal computer 5 via the I/O of the personal computer 5.</p> |
