If I am right, I mean that you have the delay(30s) between only one write and read call. So, implement the delay for another existing writes and reads also in the same manner and try again. Put some larger delay 1000milliseconds on each write and read.
Try with, what you think about delay time. I haven't worked with this kind of devices. May be, you can see in their document about this time gap between write and read. If you don't find any information then play a bit around with this delay time.
I am pretty sure that once you have implemented the "Instr - Timeout" function, it changes the delay for all the VISA Read/Writes, eventhough it is only present at one Read/Write...
So the problem is moreover to request new data than to change the delay time...
But I have manually applied a Delay for each Write/Read in my LabVIEW now, so I will run a new test over the coming night....
