| 摘要 |
PROBLEM TO BE SOLVED: To provide a data transmission system transmitting 1st data as a voltage between a couple of transmission lines that further transmits 2nd data different from the 1st data through the transmission lines. SOLUTION: A data superimposing circuit 5 sets a higher level to a transmission line 3 when the 2nd data have a high level and sets a lower level to the line 3 when the 2nd data have a low level. A data acquisition circuit 6 detects the level of the transmission line to acquire the value of the 2nd data.
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