Issue
Configuration of BACnet Foreign Device Registration
Product Line
EcoStruxure Building Operation, Andover Continuum
Environment
- BACnet IP
- BBMD
- Foreign device
Cause
Foreign Devices registration can be confusing
Resolution
When configuring a Foreign Device Registration on a B/IP BACnet Network. The Foreign Device only needs to register with the one BBMD on its B/IP Network Segment. The BBMD that has the Foreign Device registered with it creates a table called FDT (Foreign Device Table) internally which is different from the BDT(Broadcast Distribution Table) that the BBMD uses to communicate with other BBMDs.
Once the FDT confirms the Foreign Device, it is up to that BBMD to distribute BACnet communications to and from the necessary BBMD's in its BDT. and the all Foreign Devices in its FDT. In this way the Foreign Devices does NOT perform Broadcasts.
