is it necessary to use a rs232 interface?

[TroyK]

Perhaps you could try this too... right click on the VISA resource dropdown menu, and select "I/O Name Filtering..." at the bottom.

You should see a window like this...

Make sure that the "Limit interface types" checkbox is NOT checked.




Message Edited by Troy K on 03-05-2008 10:11 AM

[cabtsoibag]

Hey Dennis and Troy, I did what you mentioned...and this is what I got. There is a LPT1 instead of COM or "ASRL", and the NI-VISA is listed under software.

[RavensFan]

Check on the com ports in Windows Device Manager.

What version of VISA is installed?  Click on the NI-VISA under the software branch.  See if it is 4.2.

The fact that all of those items have yellow questions marks makes me think something is wrong with the installation of NI-VISA.  Do you remember any odd error messages last time you installed LabVIEW?  Try uninstalling and reinstalling NI-VISA.

[cabtsoibag]

Hey Ravens, I just checked but it didn't tell me what version it is, but I think you are right, there might be something wrong with LabVIEW because I also checked another computer in a different lab, it has COM1, COM2, and the NI-VISA is version 3.4. It's just werid that it works perfectly when my friend run other programs with the GPIB address... I guess I'll ask the tech guy tmr to uninstall and install the entire software. btw, the computer in my lab is version 8.5 and the one in another lab is 7.1. I assume they won't make any differences, right?