| 摘要 |
PROBLEM TO BE SOLVED: To provide a high reliability transmitter/receiver, the receiver of which can accurately receive signals transmitted from a plurality of transmitters, without allowing the signals to mask each other, even if the transmitters start operations almost simultaneously . SOLUTION: A plurality of kinds of signal-transmitting codes is preregistered in touch-type start switches 3 and 4, respectively installed to automatic doors 1 and 2. In addition, the signal-transmitting codes are made different from each other in pulse interval time. The transmitter of one 3 of the start switches 3 and 4 selects a signal-transmitting code, having pulse-spacing time which is different from that of the signal transmitted from the transmitter of the other start switch 4. Consequently, the occurrence of masking phenomenon is avoided. COPYRIGHT: (C)2004,JPO
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