I am presently using this thermostat honeywell TB3026B BACnet®, and need to connect it to my building management software. I am using a raspbberry pi base and need to connect the thermostat to my rpi. the libraries I found for BACnet in python support BAcnet IP (Bacpypes), but the device I have is BAcnet MSTP. I have the following questions :

• I found some information that says BACnet wiring is uses RS485, if I connect an RS485 to USB converter using between rpi and thermostat would that work ?
• If the above hack does work, are there any libraries in python / c/c++ that can handle bacnet over MSTP.

If the above does not work, what are the cheapest options for BAcnet MSTP to Bacnet IP conversion ? the routers I found are way too costly for me at the moment. (upwards of 400 USD in total)

I am apologizing in advance for any errors in my question, as this is the first time I am working with bacnet.