two instances of same app

[jspaarg]

I have a LabView exe file that is used to control one of our devices on a com port.

We use an FTDI device that makes a USB port appear as a com port.  There are no problems with this.

Our devices output data approximately every ten seconds and I keep the com port open and check for data approximately once per second.

The PC that runs the app has four USB ports, each connected to one of our devices.

I thought that I could open four instances of the app, one for each port.

However, I could not get multiple instances of the app to execute.

After searching what few old threads I could find related to this (2005 and earlier), it appears that I cannot open multiple instances.

There are also comments that multiple VISA resources cannot be open simultaneously.

So now my questions...

Can I have multiple VISA resources open simultaneously (say one for COM4 and one for COM5)?

Can I open multiple instances of an app?

Can I open different apps that use different VISA resources at the same time?

All help is appreciated.

[Ben]

Yes you can!

Either rename to the level VI for each instance or use a template which will acheive the same effect.

Make sure all of the sub-VI-s are re-entrant.

Ben

[Dennis_Knutson]

For an exe, a search turned up this thread for the same question. You have always had the ability to have multiple VISA resources open.

[jspaarg]

Thanks Ben and Dennis.

Dennis, your solution is exactly what I had hoped for.

Don't know why i didn't find that thread with my search.