VISA problem on one PC but not another

[Placebo]

Hi,

I've been successfully running a vi on a 32 bit XP computer to communicate to an instrument via RS232. I've put the same vi on an older 32 bit XP computer but get a VISA error.

I can control the instrument from the same old computer using the same port but running a bespoke application for the instrument, so the the hardware and port is working fine.

I've used a serial port monitor to look at what's happening. When I run the vi nothing appears at the port.

Can anyone give me some clues where to start looking ?

Many thanks

[Albert.Geven · Accepted solution]

Did you install VISA and which errornumber occurred

[james88]

Make sure that you have the latest version of visa installed in your old computer, also that the labview version is the same than the other computer. What is the errornumber?

Regards

[Placebo]

You were exactly right, thank you. I had installed LabVIEW on both PC's at the same time, expecting a full installation to have taken place on both. The old PC did not have a DVD drive so I had to do the install from another computer over a network connection. Unknown to me, this wasn't the full install I had expected, and VISA was missing, but the newer PC did fully install and perform as expected. Situation now resolved !