digital input port of USB 6009

[LSG]

I am just unable to operate the digital input port of a usb 6009 daq card. I am giving a 4.6V input to pin no. 17 and the negative part of that supply to pin no. 32. Then I have selected the port 0 in SELECT PORT of test panel and selected all input in SELECT DIRECTION. when I am running it, it is all 8 led on. After removing the voltage from pin 17, I am again running the test panel and again all the leds become on. Why it is occuring??please help...

[Dennis_Knutson]

Have you tried reading the manual? A disconnected input will be read as a logic 1 because of the pull-ups.