| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an inexpensive data communication system provided with a simple backup means, that backs up transmission of a control signal for a particular load with high importance. SOLUTION: In the data communication system, a data transmission section transmits a control signal of a particular load as a control data part of a frame signal and a leader pulse of the heard part of the frame, whose pulse width is changed with the control signal of the particular load to a data reception section. The data reception section is provided with a reception means, that extracts the control signal from the control data part of the frame signal and with the backup means, that identifies the width of the leader pulse to output the control signal of the particular load. When no control signal is extracted from the reception means, a control signal output from the backup means is used for a control signal output of the data reception section.</p> |
