Ex-Link works very well on all of the 2008 and newer models ( including power ON ). If you are using URC ( with MSC400 ) there is an entire thread on their forum - under rs232 control - including a file with a full set of commands . For crestron guys there is a module in yahoo Crestron user group . For everybody else :
www.remotecentral.com/cgi-bin/mboard/rc-custom/thread.cgi