how to aquire data from parallel port

[raichurian]

Hi everyone...

I want know how to aquire the data from parallel port not output, I want to Input the data, if any one have worked or know how to get the data from external world into PC through Paralle port/serial port please do write to me/answer.
please do not write to me to see the example present with the software.
(I have seen the example but not able to measure the analog voltage/digital data)
If you have any example/worked please post /write to me.

With Regards,
Laxmiaknt.

[Sputnikrent]

Hi Laxmiaknt,

There is a good KnowledgeBase article here that talks about how you can access the parallel port and perform simple digital I/O operations using it and details 3 different methods for doing so.

What kind of a setup do you have? What have you got connected to your parallel port, and what sort of information are you hoping to read? I looked at the file you attached, but that does not really tell me what you are hoping to do.

Let us know if this was the information you needed.

[raichurian]

Hi Rasheel,

Thanks for your post. Really I am happy with the third method,  I'll be more happy if  I am able to measure Analog voltage with the Control and Status nibbles. I dont know does it suit for my application or not but I'll try, If any examples you come accross/you know on Data Aquisation with the Parellel Port please do not hesitate to inform me/write to me.

Once again Thanx.
With regards,
Laxmikant Ramakrishna.

[JasonSmith]

For most users the parallel port is only well suited for "quick and dirty" digital I/O where only a couple pins are needed. Anything beyond this will require external circuitry. For your application you would have to create external circuitry to convert your analog signal to digital, as well as provide for properly buffering the parallel lines to ensure that you do not damage the port on your computer.

For anything more than the simplest digital I/O, it makes sense to look at an entry-level USB DAQ device, such as the USB-6008, which will give you much more functionality with very little cost.

Of course USB will not be an option if this will be running on a LabVIEW Real-Time controller, in which case you would need a solution which matches your hardware platform.

-Jason S.

Message Edited by JasonS on 06-10-2008 10:09 PM