Test and Measurement Forum

Hello,
I'm developing a LabView program with a Picoscope 4224.
- the program starts with a call to 'ps4000OpenUnit'
- then it executes configurations and acquisitions
- the program ends with a call to 'ps4000CloseUnit'
Everything works OK but:
If I restart the VI without closing LabView I get an error from 'ps4000OpenUnit' (PICO_STATUS = 3).
If I close Labview, its window closes but its icon stays in the application tray for about 30 seconds.
The same happens if I run and then close the Application.exe made by the builder.
It can be a problem because sometime this application needs to be restarted after a few seconds.
Any helps?
Thanks.

Daniele

Hi Daniele

You need to make sure that you call ps4000CloseUnit before your application exits. As you have found, you won't be able to re-open it otherwise.

Robin

As I said in my post, I DO a call to 'ps4000closeUnit' (that doesn't return any error code). That's why I'm looking for help.
Thanks anyway.

Daniele

Sorry! I misunderstood. Can you post your VI (for LabVIEW 8.2) and I will have a look.

Robin

Found my mistake!!
In the 'ps4000CloseUnit' I configured the 'handle' parameter as a pointer instead of a value.
Fixed it, now it's ok.
Thanks & bye.

Daniele