Can you give us more details ?
I have looked on Crouzet web page but I have seen only industrial products, nothing related to home automation.
Well, mainly what you need is to create a new device template which should be able to manage the protocol with Crouzet controller.
The developers will need information about the protocol between the PC (pluto system) and the Crouzet controller. And sure informations about the protocol itself to get the overall image. If the protocol is closed, only developers which signs an NDA can do it.
The developers will need at least remote access to one system which is connected to Crouzet.