Problem with seperate CAS role in Exchange 2013

Hi,

I have installed Exchange 2013 in my test environment and have Mailbox role and CAS role in seperate servers. When I try to execute Test-ServiceHealth and other connectivity related cmdlets in Exchange Management Shell for the CAS server , I get the error as "There are no Microsoft Exchange 2007 server roles installed on ." and the "The specified computer isn't a Client Access server." Is there any way I can perform these tests for the CAS server of Exchange 2013.

Thanks in advance.