Error with VISA Read (-1073807346)

[lltelford]

Hi,

I am using VISA Write/Read to control a glucose monitor and read memory files. When I run the memory file for the first time, I recieve the error -1073807346, and the explanation is "VISA:  (Hex 0xBFFF000E) The given session or object reference is invalid."

However, when I run it again immediately afterwards (without doing anything except click run), it works perfectly every time until I close out the session and restart (then I receive the same error, but it works every time after that).

I have checked my settings, and they are correct, and I have also tried to run the command with Hyperterminal, and it works. I am not sure why it doesn't work the first time around.

Any help you could give would be great. I've attached the file ("Read Mem").

Thanks.

[Albert.Geven · Accepted solution]

Hi

Do you select the correct monitor resource (I guess you do) before starting the program?

Why do you have a sequence frame around your code? The sequencing is already done by the data wires.The last wait is nonsens.

And most important: why do you have a feedback node in your visa session just before the write.

Remove that and press on cleanup diagram.

[lltelford]

Thanks -- the removal of the feedback node seems to have fixed the problem I had. Thanks for your help!