How do I call the subvi in parallel with main VI. Main vi should not wait for the subvi

Question

I have a subvi which takes the parameters like port name, transmit rate, message to transmit over serial port and Start/stop flag. This subvi calls VISA write vi in a loop continuously, till the Start/Stop flag is false, to write a message to serial port at a mentioned transmit rate. This subvi will be called from another VI. Actual intension is to transmit different messages to different ports continuously and stop them when required. In this senario, please provide solution for below points:
1. How do I call the subvi in parallel with main VI. Main vi should not wait for the subvi.
2. How does main vi can control already running subvi in parallel to it. In the above example I would like to start the subvi from main vi when start\stop flag is true and would like to stop it when the flag is false.
3. How do I call the subVI with one set of parameters from main vi, when same subVI is running with other set of parameters already from main vi(subvi being called in a case with different set of parameters each time when the case is called). Means, how do I keep track of reentrant subvi (different calls to same vi)from the same main vi.

Answer 1

Hi Dharani24,
Try if these are helpful,
http://digital.ni.com/public.nsf/allkb/DB92C44E7D4D8A1B862577CB007D9C45
http://zone.ni.com/reference/en-XX/help/371361J-01/lvconcepts/asynchronous_vi_calls/
http://zone.ni.com/reference/en-XX/help/371361J-01/lvconcepts/reentrancy/
Thanks
uday,
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