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I have found a strange error while configuring Labjack U3 device, I tried to set an I/O pin, say FIO3, to logical low, but when I try to read the state of the pin through Read State then it shows it as logical high... I don't know what's the problem.
I would be very happy if anyone can help me in solving this issue.
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Most methods of reading a digital line, set the direction of that line to input. Digital inputs have a 100k pull-up that causes them to read high when floating.
Sounds like you want to use an iotype that does not also set direction, such as LJ_ioGET_DIGITAL_BIT_STATE:
https://labjack.com/support/datasheets/u3/high-level-driver/example-pseudocode/dio