I see that Lorand has applied comments and a solution below. I expect that he pointed out that your vi is very hard to read because of the sequence structures and the fact that these are spread out over a wide area. Also, you used a lot of local variables which could be avoided in a true state machine structure.
It appears to me that you have a specific point in your program where you want to retrieve data and at another point you want to write data to port. This is easily accomplished with queues and notifiers. I can't read Lorand's solution (LV 6.1), but I expect that the solution deals with these issues appropriately.
