| 摘要 |
An arrangement for remote control of a motor-driven gate comprises a portable transmitter which generates a coded square pulse signal, and a receiver 2 placed on the gate for controlling the motor. The transmitter has a pulse flank detector which generates spike pulses of at least one of the positive and negative flanks of the square pulses, and the spike pulse signal formed by these spike pulses is transferred from the transmitter to the receiver. The receiver 2 comprises a member which is placed in front of a decoder and which forms square pulses from the spike pulses, and a phase recognition member which is connected to the output of the member forming the square pulses and which is designed to detect the mean voltage of a square pulse signal fed from the member forming the square pulses and to reset this member when the mean signal value lies outside a predetermined range. The receiver emits a motor control signal when the code of the square pulse signal agrees with a code programmed in the receiver. <IMAGE> |
