IBM Oracle RAC Cluster

I have installed an IBM rac cluster and configured the HMC and set up a NIM, 4 AP and 3 DB servers.
My problem is that when I open a console window on the HMC for any of the servers the emulation is wrong, strange characters appearing (along with some readable output) and it won’t accept ANY input. Anyone out there with any idea how I can configure the terminal emulation correctly?