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Parallel port read function no response


Cool-LV

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hi all,

using "Port out.vi" is successful to control digital signal out corresponding, but I am fail to use "Port in.vi" to read digital signal back. read from "FAQ Moderator's tells" that the read pins is Pin15, 14, 13, 11 and 10, but I connect 5V signal to them between ground (short pin 18 to 25 as ground), there are no response at labVIEW, anything that I am wrong or any focus that I should pay attention to ? thanks @!

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