| 摘要 |
PURPOSE:To avoid repetitive relay operation by providing a reception signal with relay information so as to inhibit the output when the reception signal is not addressed to its own terminal equipment. CONSTITUTION:A main controller 10 has a control section MC and a transmission section MT and the transmission section MT converts a control data generated by the control section MC while designating an address of a transmission terminal equipment into an optical signal and radiates the signal to space. Control terminal equipments 20A-20C assigned with a specific address respectively each is provided with a transmission section T, a reception section R and a control section C. Each of the control terminal equipments 20A-20C sends a signal while adding relay information in the case of signal relay and when the reception signal has the relay information and not addressed to its own terminal equipment, no output is implemented. Thus, the relay operation is not repeated. |
