A building manager has asked us if we can integrate Tridium to his existing Computrols sytem which he says is BACnet. The system has newer 32X and 64X controllers which are clearly BACnet. However there are a number older controllers like a DDC1-OPTO-1.5.

I believe they originally used the opo-22 protocol so the name makes some sense. We can't tell how those older controllers interface to the CBAS front end and if that is actually done via BACnet. Can anyone explain how this architecture might be set up and if old controllers can talk to a new BACnet system?