Maybe reentrant isn't the right word but...
I have four instruments on four different com ports
I believe that I should be able to read all four of these instruments simultaneously.
But it does not seem to work that way.
It appears the instruments are read consecutively but not necessarily in the same order every time. (VISA race?)
I have set all the sub-vi's related to the instruments to be "Preallocated clone reeentrant execution".