The topologies below illustrate the physical cabling structure of a typical BACnet/IP project. Projects using BACnet Secure Connect instead of BACnet/IP must also consider the following points:
- BACnet/SC devices also have a logical topology: Each BACnet/SC device (“node”) must be logically linked to a dedicated BACnet/SC “hub”.
- This node-hub-link is a purely logical concept with no direct 1:1 correlation to underlying structures for physical cabling. All BACnet/SC communication of nodes is routed through the hub. As a consequence, do not install hubs on low-bandwidth or high-latency points within the overall network.
- BACnet/SC is its own BACnet-datalink (similar in concept to BACnet MS/TP or BACnet/IP). As a result, BACnet/SC and non-BACnet/SC components of the network must be connected by a BACnet router in between. Any PXC5/7 automation station that supports BACnet/SC as a hub may act as a BACnet router.