Parallel while loop sub vi not executing simultaneously

[jm22b]

Edit - I have solved my issue, please delete/close etc

Hello,

please see attached the vi and relevant sub-vi (while loops labelled "Single Readings").

I am trying to talk to two identical instruments attached via  RS-485 to USB converters to two USB ports on my computer. The while loops holding the sub-vi's that are responsible for polling the instruments do appear to execute in parallel, but the sub-vi's themselves will only execute one at a time. I must switch off the first, in order for the second to start.

I think this has something to do with how I am passing the control references to the front panel, but i'm also wondering if it could be due to having two copies of the same sub-vi trying to run with different inputs?

Thanks in advance for any help you can give!

[jm22b · Accepted solution]

This topic can be closed/deleted.

The solution? Remember to set the reentrant properties...

[RobertoBozzolo]

...but above all, remember to post to the correct board (LabVIEW board)