| 摘要 |
PURPOSE:To transmit a monitoring data accurately at a long distance line, by discharging a capacitor in an integration circuit at the trailing of a return timing from a terminal to a master station. CONSTITUTION:A control signal S transmitted from a master station 1 is received at a terminal 2 and a return signal B from the said terminal 2 is returned to the master station 1 when a prescribed load control is made. At the leading of an H level section (tH) of a return timing signal BT, a switch circuit 14 is turned on and a capacitor C of a storage (integration) circuit 5 is rapidly charged with a conversion voltage C from an amplifier 9. After a prescribed period (tO), the switch circuit 14 is turned off and a peak value of the conversion voltage VC is stored in the capacitor C. When the switch circuit 14 is again turned on at the trailing of the H level period (tH), the charge charged in the capacitor C is rapidly discharged via the switch 14 and the amplifier 9 for the preparation for the reception of the next frame. |
