Triggering digital input in PXIe 6363

Hello,
I was using the Daqmx to generate digital signals. I have a VI which writes digital signals and reads the digital input back continuously. I want to read a finite number of samples. For that I had the start task, read and stop task inside the same while loop. This works fine but then the VI is slow. So I wanted to trigger the digital input and take the start and stop task outside the while loop so that the VI runs and reads the digital data till the stop command is received. This does not work for some reason. I am posting my VI with this post. Can anybody please help me where I am going wrong.