I worked on the application and now according to the position of the LASER on the PSD i see the movement of the dot on the graph. But what happens is when the LASE is pointing in the center, the values of X and Y must be (0,0) and it should be shown in the center. But in this case the (0,0) is shown on some corner. I want to map the position of the LASER on the PSD exactly to the graph.
I don't have LV on this machine so I can't look at your code. If you want the graph to show (0,0) as being in the center you need to shut autoscaling off. Using the Graph properties page select the Scales tab and shut off the autoscale for both scales. Enter appropriate values for the scales e.g. -5 to 5. This will put (0,0) in the middle of the graph.