I think you can hook a York ISN or Micro Gateway system into that system, and communicate through that. There is also a RS485 port that will except transmit and recieve data that way. I'm not well versed in the building automation, although I do the factory startup and service on York chiller equipment. I'm sure you can get some help through your local York/JCI service provider in your area.
I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI