How are the BACnet 4 layers (physical, data link, network, application), related to the TCP/IP 5 layers (physical, data link, network, transport, application)?

Are they separate of them, or build on top of them, or something else?

1 Answer 1


BACnet and TCP/IP are two different protocol stacks. They’re roughly analogous to each other.

  • Yes I know but I am comparing because BACnet is usually used in an internet environment (TCP/IP).
    – X Y
    Jul 15, 2022 at 11:55
  • @XY BACnet/IP is one possible form of BACnet - in that case it runs on top of UDP's transport layer.
    – Zac67
    Jul 15, 2022 at 11:57
  • @Zac67 so it runs on top of UDP's transport layer .. why not in top of IP's network layer, since it is BACnet/IP ?
    – X Y
    Jul 15, 2022 at 16:53
  • You'd need to ask the vendors why they named it as they did. Directly on top of IP could work (with some IP protocol number allocated for BACnet) but would never cross a NAT router.
    – Zac67
    Jul 15, 2022 at 17:23

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