| 摘要 |
<p>PROBLEM TO BE SOLVED: To easily additionally install an expansion unit board to a basic unit board by only adding two kinds of elements and regular wiring when additionally installing the expansion board, by use of the same element composed of a circuit comprising a few kinds of elements. SOLUTION: In an automatic discrimination value-setting device for the expansion unit boards 16a, 16b, 16c, etc., the respective expansion unit boards 16a, 16b, 16c, etc., connected to the basic unit board 14 are mutually cascade- connected by n (n>=2) signal lines 18, and the respective expansion units 16a, 16b, 16c, etc., have discrimination value-setting circuits 12, 120, 220 each additionally setting its discrimination value D. The discrimination value-setting circuit 12, 120, 220 includes a first exclusive OR circuit 24 outputting the exclusive OR of a high electric potential input 42 and a first signal S1 of the n signal lines 18, and a second exclusive OR circuit 28 outputting the exclusive OR of the first signal S1 and an input of a second signal S2. The high electric potential input 42 of the connected expansion unit board additionally changes and sets each the discrimination value D.</p> |
