Multi Evaluation board communication

Hi,

I have 6 AD9914 evaluation boards connected to the same computer. I'm using the AD9914 Evaluation Software to talk to them.

Initially, I connect one board after another to the computer. Thus I could identify each board because I know their Instances(Ezssp-X)(the red circle below in the picture).

After I restart the computer, however, the orders of the boards are changed. So I have to reconnect the board to computer again to figure out their Instances.

Is there a easy solution? 

Thanks, Yewei