| 摘要 |
PURPOSE:To obtain a device which is safe and is capable of saving electric power by turning on an electric power source for driving a remote electric power source control device by a carrier wave detecting signal from an MODEM, and thereafter, turning on an electric power source of a subordinate terminal staion. CONSTITUTION:When a system is not operated, a main electric power source switch part 7 and an auxiliary electric power source switch part 8 are opened, and an electric power source of a subordinate terminal station 3 and a remote electric power source control device 4 is cut. An MODEM2 receives a carrier wave from a main terminal station 1, and outputs a carrier wave detecting signal to a carrier wave detecting signal line 9. The auxiliary electric power source switch part 8 supplies the carrier wave detecting signal to the gate of a solid- state relay 12, and the relay 12 is turned on, by which the auxiliary electric power source switch part 8 is closed, an electric power supply line 10 and 11 are connected, and electric power is supplied to a control part 5 through an electric power source part 6. When electric power is supplied, the control part 5 closes the main electric power source switch 7 and turns on the electric power source of the subordinate terminal station 3. |
