| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a data communication system which can guarantee operation control of a specified load even when a light signal corresponding to the operation state of a plurality of switches is hindered from being sent as a system which sends the light signal to a control part by space propagation to control the operation of the specified load. <P>SOLUTION: Resistances R1 and R2 are connected in series to switches 11 and 12 connected between a power line 51 and a ground line 52, and the control part 30 grounds the ground line through a resistance R0. According to the operation state of the switches 11 and 12, the potential of the ground line is varied and the operation state of the switches 11 and 12 are reported as an electric signal to the control part separately from the light signal. <P>COPYRIGHT: (C)2003,JPO</p> |
