I have a new customer who has a old suite16 system. I am obviously trying to get control over the system through RS232 since the suite16 has no networking features. They are using the RS232 already and I think I need to get a ISO-CAT II to add another RS232. Does anyone know if this is all I need or has anyone run across having to do this?

Plus just extra credit:
They have a lutron Homework Illumination as well. I'm trying to get control over that as well. I think they need a Lutron HQP6-2 as well. Would anyone have any experience in dealing with this?