VISA write timing

[jyang72211]

I have a VISA write in a state machine, and the write was a bit slow.  It was taken out of the machine and placed in a seperate VI for timing analysis.  Affter the VISA write was placed in a different VI, the write duration decreased by 1s.  What reasons could have caused it?  Thanks!

[Dennis_Knutson]

Not enough information. What sort of physical connection? How many bytes being written? How did you determine the write was the problem? Where's your code?

[mikeporter]

...and what is the device at the other end of the wire with which you are communicating?

Mike...

[jyang72211]

The instrument is a precise DMM that connects to a GPIB module in a PXI chassis connected to a laptop through an express card.  The command written to the DMM is a string with about 10 characters.  We use a flat sequence structure with the tick node and the 1st and 3rd frame to time the performance of the write node in the 2nd frame.  I don't have the code.  Somebody else is working on it now, but I was pull in to have my brain picked (the NI forum as well).  I am just looking for general advise.  Thank you!

[jyang72211]

Refer to my previous post.  Thanks!

[Dennis_Knutson]

Well I'm not going to even try to guess. The fact that someone is working on the program seems a poor excuse. Surely you can pull a copy from source code control.

[billko]

You need to bring the patient in to get a diagosis.

[jyang72211]

ok.  never mind.  He didn't check it into source control.  It is on his PC.  I will let him figure it out or ask it on the forum himself.  Thanks!