I do the hvac in a building with a honeywell control system. There are around 100 vav and fan powered boxes that are connected on a lon network and there is a lon interface connected to the honeywell system. The rest of the honeywell system is not lon according to the honeywell guy, the controllers for the air handlers are xl 50 I think. The honeywell system seems to only monitor the boxes but we cannot actuate the valves from the computer. Can I access the vav boxes with lonspec and how do they mix the two systems.