When installing SE7000/SE8000 Room Controllers to connect them to a BACnet MS/TP network, multiple issues can arise:
Leaving the Room Controller's COM address at 254 (default value out of the box) will make the room controller undiscoverable by the front end.
Choosing a Com address value between 128 to 253 will cause the front end system to convert the com address to 127, causing duplicates when working with multiple Room Controllers.
Room controllers with COM address set to 0 will prevent the front end from discovering any devices
SE8xxx Room controller
SER8300, SE8300, SE8350, SE8600
Viconics branding VT8000 Series
SE7000 Series Controllers, VT7000 Series Controllers, 7600, 7300, 7200
Master devices, those who participate in the token-passing protocol, must be addressed from 1 to 127. Addresses from 128 to 253 are reserved for slaves who do not participate in the token passing — however, they can occupy lower addresses as well.
COM address must be changed to a value in the range of 1-127