read parallel port

[indrajit]

dear all
       reading parallel port having problem its giving same value.............i am using windows xp and and labview 8.5.........
anything else to activate or to install..........

[ShotSimon]

Are you using the Parallel Port Read and Write Loop.vi example?    Regards, -SS

Message Edited by ShotSimon on 07-11-2008 12:11 PM

[indrajit]

dear ss
                   i am reading only data from the device.....i connected pin 2 -9 for data and then ground ...any thing else i want to connect .

[smercurio_fc]

Are you saying you made your own cable to connect to some device which generates digital I/O? Are you sure the device is changing these lines? Have you verified it with a multimeter? Did you make sure the voltages match? The parallel port's voltages depend on the manufacturer of the motherboard. You must check the documentation of the motherboard to determine whether you're dealing with 3V or 5V logic.

[Ray.R]

You may also need to configure your BIOS appropriately.

I posted a document which describes how to use the parallel post 3 or 4 years ago... I will look for it.

R

[ShotSimon]

indrajit,

I found this article to be very useful here see Figure 3.  Careful the DOS debug command may be emulated on XP so you may show the wrong port address using it.  Try the example I mentioned above along with the default port address. 

Regards,

-SS

Message Edited by ShotSimon on 07-14-2008 09:54 AM

Message Edited by ShotSimon on 07-14-2008 09:54 AM

[Ray.R]

Have a look at this post. There is a pdf which contains interesting info. Not sure why someone gave it a bad rating though.. 😞

[Mathan]

---

JoeLabView wrote:
pdf which contains interesting info. Not sure why someone gave it a bad rating though.. 😞

---

Don't worry JLV. That's really a good material. Thanks for that sharing... so u got five for all..........

[Ray.R]

Thanks mathan!  😄