Done it successfully for CS 3.0 and RME 4.0
Common Services 3.0:
setup.exe quiet answerfile=c:\answerfile
These are the tags which go in the answerfile for quiet mode install.
adminPassword=admin
casuserPassword=casuser
destination=d:\apps\cscopx
systemIdentityAccountPassword=admin
Please note that the destination dir should be empty.
You may choose any destination dir. Note that if you plan to install in a directory such as c:\program files\cscopx you would have to enter this:
destination=c:\progra~1\cscopx
RME 4.0:
setup.exe QUIET
Random password will be created for RME database. You can reset using dbpasswd.pl.