| 摘要 |
PURPOSE:To prevent unlimited consumption of battery power source as well as enable communication for a specified time even if an accessory switch is put off by providing a parent unit with a computing means outputting changeover signals of a first current supply switch when the current supply time of a second current supply switch becomes a specified time. CONSTITUTION:After a parent unit 7 is initialization set through closure of a power supply switch 7e for user side operation, the changeover contact 13b of a first current switch 13 is thrown in a power source line 2 according to a control signal from a microcomputer 7d in the case an ACC switch is OFF, and a current supply time 17 is reset. In the case a second current supply switch 15 is closed the time 17 is started and it is judged by means of the timer 17 that current supply time has a specified value. When the result of judgment is YES the timer 17 is stopped, and the changeover contact 13b of the first switch 13 is thrown in an ACC line. |
