| 摘要 |
PURPOSE:To preset various kinds of modes and a personal identification number, etc., on a telephone set in one's own home, by providing a first switch which connects a telecontrol unit to a DC power source part after removing from a telephone line, and second switch which supplies an item set signal to a CPU. CONSTITUTION:At a state where the first switch 11 is switched to the telephone line, a voltage signal of level (H) is inputted to the specific terminal of the CPU 5 by switching the second switch 12 to a +V power source, and the telecon trol unit is set at a call waiting state. Meanwhile, when the first switch 11 is connected to the DC power source part 10, the second switch 12 is also switched to the ground side according to the above switching. Thereby, the backup of the telecontrol unit is performed by the DC power source part 10, and also, the voltage signal inputted to the specific terminal of the CPU 5 is inverted to a level (L), then, the CPU 5 goes to an item set waiting state, therefore, it is possible to store or change the personal identification number or various kinds of modes in a memory part 7 from the telephone set 4 in one's own home via an incoming part 2. |
