Finally got set up with a Honeywell Spyder controller here in the office. I found on HVAC talk that the unit will use auto detect to set the baud rate on power up so tied the unit into an existing MSTP network and we were good to go with our various bacnet tools.
Here is the connection setup here for integrating with typical Bacnet devices: item2 is the T3 controller, Item4 is a VFD connected over Ethernet and Items 5 and 6 are connected over RS485 Bacnet MSTP. The programming for each device is shown at lines 4, 5 & 6. You can see the format is the same regardless of how the device is connected. You can refer to any device in the building using the Bacnet instance and the usual Bacnet objects such as BI, BO, AO, AI, and AV.
