PAC or EPIC as IO Device for Honeywell

Has anyone used Snap R1 or Epic PR1 as a remote IO for Honeywell HC900? What did you use for communication? Modbus TCP as a slave is an option but. Can we use Ethernet IP ?
Just curious and thought I would ask if anyone is doing it. On another note we have Ignition running on the Platform but I would still like the HC900 to communicate with IO Directly

Thanks All. Dave