| 摘要 |
<p>A remote control system (1) remotely switches an electric power supply (8,6) to the display section (4) of a display apparatus whose display data control section (2) and display section (4) are located far from each other and separately supplied with power from their respective local commercial power sources. The control system (1) comprises an oscillator (11), a counter (12) adapted to output a switch opening signal after counting out a predetermined number of pulses output from the oscillator (11), and a relay switch (13) inserted in the power supply (6,8) to the display section (4) and adapted to be opened by the switch opening signal from the counter (11). The counter (11) receives at its reset terminal (R) the clock signals transmitted to the display section (4) from the control section (2). While the control section (2) continues to output the clock signals, the counter (12) does not output the switch opening signal, and the relay switch (13) remains closed. If the clock signals cease for a predetermined period of time, corresponding to the predetermined number of clock pulses, the relay switch (13) is opened, thereby cutting off the power supply (6,8) to the display section (4).</p> |
