Hello, thanks for your answer. But I placed the button outside the loop so that it don=B4t work every iteration. I want to open a com port, start a microwave generator with it or something else - once only or alternativly in very different time intervals - user controlled.
Or for example storing data on disk. And not only at the starting of the VI. On the other side I need to control the temperature, the power and so on every second oder millisecond. Thanks
