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NI USB 6525 Digital Input Signal Voltage

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I have connected my circuit as in the attachment. From the voltage divider, i should have get a voltage reading of around 4.8V(LOGIC HIGH) when my X06 signal supply is 24V DC. However, i can only get a voltage reading of 1.8V(LOGIC LOW) when i measure the voltage at port 1.0+ and 1.0-

Anyone face the same issue as mine? How to solve the problem? Please advise. Thanks.


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