Open Manage Network Manager 5.3 Register a Force 10 S4810 Switch

Hi

I am trying to register a Force 10 S4810 switch on OMNM 5.3 but am having trouble with authenticating the switch. I have previously registered a Dell PC6248 switch on OMNM without a problem, all I had to do was set an SNMP community string on the switch and it authenticated and registered the switch fine. I have tried the same on the S4810 but get the error "Missing:CLI"  

My question is, is there more / different authentication required for F10 switches other than setting an SNMP community string or does a Telnet/SSH authentication profile have to be used ?

Also are there any step by step guides to setting up Force 10 switches on OMNM as I cant seem to find one anywhere ?

Thanks,

Andrew