How to create a stop button to send commands via the serial port and finish labview vi?

I want to send two commands on my camera, the first to stop the execution and the second to get out of the remote control mode. This is done on RS232. What I want is a way to put this in my existing VI that tells the device to run. Now if I stop the program, that the devices just run the last command unless I have stop manually. How can I set up a stop button that are not sent to all orders except in such a hurry? I tried the structure of the case, but didn't know how to put a part of 'status quo' If island stops in the while loop is not pressed the button.

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