I just had someone ask me about York Net.
Any information is welcome.
Is this like BACnet with a Johnson Control name
Is this a new Johnson Control Protocol
yorknet is the York dealer network it is not a com protocol.
I believe that what you are looking for is YorkTalk. It is a proprietary York Chiller protocol. Fieldserver makes bridges for talking to it. Look up the Fieldserver FS-8700-30.