How to control a parallel port with labview

Hi. I'm trying to control a dc motor with a parallel port using labview. the program has to be able to vary the out put voltage of the computer (0 - 5V) through the parallel port into a circuit which will step up the voltage for the motor. Any help would be greatly appreicated. garreth

Do you want to output and varying signal from the parallel port pins? If so you can't do it, the port pins are digital and can only be high or low, not inbetween. You can control the individual lines high or low using the In/Out Port vis in Advanced>>Port I/O. For more help on doing this search the message archives (I know I've answered a few) and NI's site, there is some good info on it out there. Try some of these for starters:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/0989d3d9dafae64e8625680400679736?OpenDocument
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/f4146c66990c46388625695f00726581?OpenDocument
http://digital.ni.com/public.nsf/3efedde4322fef19862567740067f3cc/f3c4ee6ee2c23ef386
25646b007882c8?OpenDocument
http://www.advmeas.com/goodies/parallelport.html
I hope this helps get you started
Brian

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http://zone.ni.com/devzone/explprog.nsf/6c163603265406328625682a006ed37d/49664743ded6f1da862564bc004e3a7f?OpenDocument
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Attachments:
printer_port_test.zip ‏41 KB
dsub_25_parallel_port.doc ‏29 KB

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"Wouters V" wrote in message
news:39fff2de$0$4493$[email protected]..
> Hi
>
> How can i control the k8000 from http://www.velleman.be ( I2C bus)
with
> Labview.
> all info is welcome.
>
> [email protected]
>
>
>
>
>

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Thanks Brian.
Well here is the next problem. I got a VI (attatched) off ni.com and it works fine on a windows98 platform. But quits working on NT.
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Attachments:
parallelPortSwitcher.vi ‏124 KB

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[email protected]

There are some vi's that should work for you for the parallel port. However it has been communicated that with windows after 98 it's a little bit more complex...
I add a llb I downloaded from this forum a while ago that should perfectly fit your need (if you get it to work :-)
Greetings from Germany
Henrik
LV since v3.1
“ground” is a convenient fantasy
'˙˙˙˙uıɐƃɐ lɐıp puɐ °06 ǝuoɥd ɹnoʎ uɹnʇ ǝsɐǝld 'ʎɹɐuıƃɐɯı sı pǝlɐıp ǝʌɐɥ noʎ ɹǝqɯnu ǝɥʇ'
Attachments:
AD9835 SPI.llb ‏339 KB

How to control a parallel port with labview

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