OPC Interface to honeywell XLs

I am currently providing a bacnet OPC server (kepserver) and the client has asked me to also provide another one for a honeywell system. Basically this is just a relay for a few tags.

The honeywell system is an EBI 3.1 head with xl500/xl600 series controllers which i believe are cbus.

Am i correct in saying that the EBI system has (or can have) an OPC interface?
There is a product form softyon although the site dosnt give me alot of confidence.

It would be nice if there is something that can sit on the ethernet layer to poll the controllers.