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ADIO-100 contact switches
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I don't have one of these but you should be able to find the schematic and a further technical manual here http://www.integrityusa.com/rs232-m1...a-acquisition/ - to me considering the 100K resistors are tied to ground to prevent floating inputs to me that says that you would have to wire your switch between +5V and the input pin but don't quote me on that.
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