Read Thorlabs optical power meter in LabVIEW 2018 via USB connection

[MVJ99]

Hello all,

I have been trying to read data from Thorlabs PM101R optical power meter using Labview 2018 (32 bit). Everything was fine. But suddenly I get an error as -

Possible reason(s):

"VISA: (Hex 0xBFFF0039) Unable to queue the asynchronous operation because there is already operation in progress." I read the threads but did not get solutions. Any help will be appreciated.

[psuedonym]

instrument is still doing something

[MVJ99]

Can you specify something because i am new to LabVIEW. I have attached encountered error screenshots to get a clear picture.

Thanks in advance.

[psuedonym]

Have your employer send you for LabVIEW training.

[cstorey · Accepted solution]

It says there is already an operation in progress, meaning another program is currently controlling the instrument.  Are you still running another program?  NI-MAX or an instrument panel?  Perhaps a ThorLabs program?  You can't run 2 programs to control the same instrument at the same time, they fight for control and your LabVIEW code lost.

If you can't find a program running. Cycle the power and try again.