Chapter 3: Signal Connections - Advantech PCM-3718H User Manual

Pc/104 12-bit das module with programmable gain
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To receive an OPEN/SHORT signal from a switch or relay, add a pull-
up resistor to ensure that the input is held at a high level when the
contacts are open. See the figure below:
+5V
4.7K
D.GND
Chapter 3 Signal Connections
21

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