| 摘要 |
PROBLEM TO BE SOLVED: To provide an indication system of indicators indicating dangerous places in a construction site.SOLUTION: There are provided indicators arranged in plurality and a master unit, where the master unit includes a receiver that receives carrier waves from transmitters of the indicators, a transmitter that transmits the carrier waves to be received by receivers of the indicators, and a control unit; when the indicators receive an initialization signal from the master unit, transmit signals with identification codes of the indicators so that the master unit can learn order of the arrangement of the indicators from the identification codes.SELECTED DRAWING: Figure 1 |
