Parallel port in WinXP with LabVIEW7

[SamiKotijarvi]

I have created an exe with LabVIEW7 (inport and outport should work without AccessHW) and it works fine with

Windows2000 I have in my computer. We installed the exe to another computer, a laptop with WindowsXP. Now

the program works fine except for two bits in Base address +1 (nAck and Busy). Anybody had same kind of experiencies?

[smercurio_fc]

Did you check that the parallel port mode is the same in the Device Manager?

[SamiKotijarvi]

We have actually changed parallel port mode from BIOS, but the behaviour was the same in all modes. We didn't check what the device manager says. Also I have to correct that it is only the nAck that doesn't give the correct read from the port. Busy seems to work ok.

[rolfk]

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@SamiKotijarvi wrote:
We have actually changed parallel port mode from BIOS, but the behaviour was the same in all modes. We didn't check what the device manager says. Also I have to correct that it is only the nAck that doesn't give the correct read from the port. Busy seems to work ok.

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I'm pretty sure Windows believes that it knows better how a parallel port should behave than the BIOS and accordingly takes control of it. And with quite some BIOSes this might even be true too.

Rolf Kalbermatter

[SamiKotijarvi]

Port is ECP in both computers and in BIOS as well as in Windows. The windows driver version is of course different (Win2000 vs. XP).

The question still remains....does the XP control the port and use it for some mysterious things or why can't we read this one bit from the

parallel port? By the way we have tested the exe with another laptop running Win2000 and it works with it.

[wha@atmel]

Hi,

what do you think about  a  defective Pin ( caused by ESD or overload ) ??

If you have a  PCI  Add-On card  like e.g.  EX-41450 you can try this with your PC and

then you know for sure that it is not a Hardware - Problem.

Only an idea.........

Regards

Werner

[Ray.R]

Win XP does have some restrictions on the parallel port as compared with Win-2000.  Win-XP added a security feature which does not allow to change the parallel port IO addressing.  However, I doubt that it would affect nAck. 

Ray

Message Edited by JoeLabView on 01-04-2006 12:05 PM