Hi, I am learning to use LVOOP. I want to have hardware abstraction layer (HAL) for my test program so it works for different instruments. Most of the instruments are connected to the computer using GPIB so I can use VISA.Therefore, I created a hardware abstraction class called "meter" with a VISA as its property. So I have a dynamical dispatch VI called write VISA. This can work if all the child instruments are communicated with VISA. However, one instrument is connected using USB and the vendor's instrument driver is .Net. So this one instrument won't work with dynamical dispatch because I can't using write VISA. What is the best way to handle this situation? Thanks, Joseph

Why do you need to use dynamic dispatch to write the refnum? Somewhere in your code you must select a specific instrument instance, maybe using a case structure. At that point you could also include initialization code for the specific instrument. In the VISA case you might write the refnum, and in the .NET case you could call the constructor (that is, create the refnum inside the class, don't pass it in from the outside).

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Dynamic dispatch VISA and net

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Yes. I should just do it...

Thanks.

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Dynamic dispatch VISA and net

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