| 摘要 |
<P>PROBLEM TO BE SOLVED: To install each remote-control receiver at a position where a reception level is excellent without using a special device for measuring radio wave intensity, thereby improving installation workability of a plurality of remote-control receivers. <P>SOLUTION: A plurality of remote-control receivers 31 to 36, each having transmission function as well as reception function, have level detection means 31e to 36e for detecting the reception level of radio signals transmitted by remote control transmitters, respectively. The single remote control transmitter has reception function in addition to transmission function and has level display parts 40t to 40z for displaying the reception level of radio signals detected by the level detection means. Radio communication between the remote control transmitter and the remote control receiver is constituted in such a manner as to be switchable between a normal operation mode, in which the remote control transmitter transmits a control signal to the remote control receiver to control an electrically-driven motor, and a maintenance mode, in which the reception level of radio signals between the remote control transmitter and the remote control receiver is detected. <P>COPYRIGHT: (C)2013,JPO&INPIT |
