I'm writing a piece of code to use an NI USB-6251 DAQ to measure speed of sound in water. To do this I'm sending a burst of say 4 or 5 cycles of a sinewave out on one of the analogue outputs of the DAQ, and then listening for the returned signal on one of the analogue inputs. My problem is that the send/receive bits of code are not executing concurrently - the two sub VI's in the flat sequence structure (screen capture below) still execute sequentially. Is there an easy way to get these to execute simultaneously? I'm using the DAQmx Timing VI in both strands of the code. The top piece of code is producing the output, bottom is for the input.
Initially I thought it was a reentrancy problem, but I set their properties to allow more than one instance of the same VI to open at any one time.
Any help would be greatly appreciated.
