BACnet Broadcast

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See BACnet Specification, Section 6.3.2, page 54


  • Local broadcast

Defined as a broadcast to nodes on the same BACnet Network as the sender.

IP Networks: An Local IP broadcast to the local IP subnet only. e.g. 192.168.1.255 (Subnet mask 255.255.255.0)

MSTP Networks: ???


  • Remote broadcast

When the DNET specified, and the MAC address is zero (length is 0)

A DNET of 0xffff indicates a Global Broadcast (see below)


  • Directed broadcast

BBMD specific terminology: On BACnet/IP networks, requires the use of a BBMD

See specification J3 pg 569


  • Global broadcast

DNET = 0xffff DLEN = 0

On BACnet/IP networks, requires the use of a BBMD to enable the broadcast to transition across IP Subnets.



Keyword List
APDU BBMD BVLC BVLL DADR DNET Encoding I-Am LSAP MAC NPCI NPDU NSAP NSDU SA SADR SNET

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