| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of signal lines interconnecting boards in a structure in which a plurality of sensor boards are cascaded from a control board. SOLUTION: In the structure in which the control board 1 and the plurality of sensor boards 2 and 3 are cascaded by four signal lines for power wiring and control and output signals, each of the sensor boards 2 and 3 comprises two comparators CMP 1 and CMP 2 for determining whether or not an analog voltage is within a predetermined range, and an output switch circuit for outputting the output of a sensor PI 1, PI 2 mounted on the board as an output signal if the analog voltage is found within the predetermined range. COPYRIGHT: (C)2007,JPO&INPIT
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