how to avoid dependance between output digital port with a PCI 1200 daq card?

[jflab]

Hello,

I don't manage to fix the state of a line on one port (PA0 for ex) without change the state of another line of another digital port (PB0 for ex)
I use a PCI 1200 Daq card with Labview 5.0.1 (under Windows 98)

How to configure a robust state (high logic level) on a line of a port??

Does anybody have an idea on this problem?

Thanks a lot in advance and happy new year to the community

JF LAVEZARD

[Dennis_Knutson]

You use DIO Port Write with a line mask to update an individual line of a port. Look at the VI called Write to Digital Line on the Data Acquisition>Digital I/O palette. Don't know what you're doing that could cause an update on one port to affect another port. What functions are you using? Could you post your VI?

[jflab]

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jflab a écrit:
Hello,

I don't manage to fix the state of a line on one port (PA0 for ex) without change the state of another line of another digital port (PB0 for ex)
I use a PCI 1200 Daq card with Labview 5.0.1 (under Windows 98)

How to configure a robust state (high logic level) on a line of a port??

Does anybody have an idea on this problem?

Thanks a lot in advance and happy new year to the community

JF LAVEZARD

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Hello,

I've found the problem

The PCI1200 has a chip 8255 for Digital I/O

If I use the bad VI, it reconfigures the port and all the lines go in a low logic state
so I'd to write only on the port or the line without reconfigure the port

So the good VI in the palett is: Port Write and not Digital Port write!

See attached file..

Thanks

Best Regards