Disklavier

Hell0,

I need help with setting up my laptop which has cakewalk sonar 
installed and interfacing it with my disklavier.  I have been unable 
to use my computer with appropriate midi cables using the serial 
port and I have downloaded the Yahama CBX driver.  Is there a 
synopsis available to document the steps, settings and requirements 
for playing midi songs from the computer to the piano.  Is there a 
USB connection that will allow for midi out?  If so where?


Many thanks for any help

Frank