VISA can't read all ports

[Dan0818]

I'm reading data from 34 ports with LabVIEW 7.1 using VISA. But some
ports are not accessable by VISA, not all but 5-6 ports get this
error. However if I use old serial command, from LabVIEW 6.1, I can
access all 34 ports. What could be the problem?
Also can I use both old serial vi and new VISA in the same VI?

Thanks,

Danny

[Brian Powell]

I'm not sure what the problem with VISA is, so I hope someone else
responds. Regarding your last question, though, you can use both.
However, for each COM port, you have to consistently use the same API.
E.g., if you open with VISA, you have to read/write with VISA. You
can't open with VISA and then try to use the old read/write functions.

I hope this helps.

Brian

[JLS]

Hello,

Can you attach a screenshot of the error you are getting?

Thank you,

JLS