In the Device Properties dialog box, 
click the No Device button. 
 
This operation sets the Controller to 
the offline state. 
Wait until the startup process of the 
Controller is complete. Then click 
Delta Tau – Communication Setup 
on the toolbar to display the Device 
Properties dialog box. 
In the Communication Setup dialog 
box, click the Connect button. 
 
This operation sets the Controller to 
the online state.