After you change the signal of the photo diode Photo diode will send a signal to the Control Board to remove phut is processed. Then the Board will do the control interface to the computer via the pwio programs.
After changing the signs of photo diode. Photodiode output to signal out to the control board to be processed. The control board will interface with the computer via Lab View.
After the changes of signs of the photo diode. Photodiode output signal to the control board to take out the processing. Then the control board to the interface with the computer program through lab view.