please let us know how to declare usb port as 101 in labview adc200vi example. There is no option for usb port. there are only four options none, lpt1, lpt2 & lpt3 . also if we use parralel port lpt1 using parallel port then adc200vi example run for one time only. on running it second time it does not open port lpt1 "& output vale 0 only. we have to shut the labview 8.2b23 to make the vi run again. please help as we are stuck with only adc200/12 device without any use. We have pico make parallel to usb adapter. Pcoscope runs ok with usb adapter. VB example works fine with usb port. What we have to develop programme in labview only.please reply.