BACnet/IP in Detail - kargs.net

1 BACnet/IP in Detail BACnet/IP Overview Essential Packet Types Foreign Device Registration bacnet Broadcast Management Device NAT and IPv6 BACnet/IP Overview UDP/IP on port 47808 (0xBAC0) NDPU, APDU same as others MAC address is IP Address, Port Number Unicast, Broadcast bacnet Ethernet, BACnet/IP Share Wire BACnet/IP Packet0x81 BVLC TypeBVLC FunctionLength (inclusive)Optional BVLC dataOptional NPDUO ptional APDU2 octets, most significant octet first, includes BVLC Type and octetVaries depending on the BVLC Function1 octet Essential Packet Types Original-Unicast-NPDU (0x0A) Original-Broadcast-NPDU (0x0B) Forwarded-NPDU (0x04) Original-Unicast-NPDU0x81 BVLC TypeBVLC FunctionLength (inclusive)NPDUAPDU2 octets, most significant octet first, includes BVLC Type and octet1 octetVariable Length0x0A Original-Broadcast-NPDU0x81 BVLC TypeBVLC FunctionLength (inclusive)NPDUAPDU2 octets, most significant octet first, includes BVLC Type and octet1 octetVariable Length0x0B Forwarded-NPDU0x81 BVLC TypeBVLC FunctionLength (inclusive)NPDUAPDU2 octets, most significant octet first, includes BVLC Type and octet1 octetVariable Length0x04 BACnet/IP Address of Originating Device4 octetsIP Port Number of Originating Device2 octets (port number may vary)

2 0xBA0xC0 Broadcast ManagementIP Subnet 1IP Subnet 2 LAN SegmentBACnet DeviceInternet RouterBBMDI nternet Foreign Device RegistrationIP Subnet 1IP Subnet 2IP Subnet 3 LAN SegmentBACnet DeviceInternet RouterBBMDF oreign bacnet DeviceInternet BACnet/IP RoutingLAN SegmentBACnet DeviceInternet RouterBBMDBACnet RouterBACnet/IP Net 1 Non- BACnet/IP Net 2 Internet BACnet/IP and NAT135-2004 Addendum oAccommodates remote operator access via Annex J BACnet/IP through NAT SegmentBACnet DeviceInternet NAT RouterBBMD/RouterB/IP Network 1NB/IP Network 1B/IP Network 2BR 1 NATBNATAB/IP Network 3BR 2 bacnet /IPv6135-2004 Addendum qDefine virtual addressing for data links with MAC addresses longer than 6 octets0 Virtual MAC AddressDevice Instance Number0000000000000000000000076543210 Bit NumberHigh 6 BitsHigh 6 BitsMiddle OctetLow Octet bacnet /IPv6135-2012 Addendum ajDefine BVLC for IPv6 VMAC additionsDefault UDP port: 47808 (X'BAC0')Configurable: 47808-47832, 49152-65535 AddressScopePurposeFF00::BAC0 Reserved Do not ::BAC0 Interface-local/Node-localPackets with this destination address may not be sent over any network link, but must remain within the current node; this is the multicast equivalent of the unicast loopback ::BAC0 Link-localUsed to reach all B/IPv6 devices on the directly attached link.

3 This scope is not routable by IPv6 ::BAC0 Reserved Do not ::BAC0 Admin-localThe smallest scope that must be administratively ::BAC0 Site-localRestricted to the local physical network. Used to reach all B/IPv6 devices at the same ::BAC0 Organization-localIntended to span multiple sites belonging to a single ::BAC0 GlobalIntended to be routed over the public Internet. bacnet /IPv6B/IPv6 BVLL MessagesBVLCF unctionX'00' BVLC-ResultX'01' Original-Unicast-NPDUX'02' Original-Broadcast-NPDUX'03' Address-ResolutionX'04' Forwarded-Address-ResolutionX'05' Address-Resolution-ACKX'06'Virtual-Addre ss-ResolutionX'07'Virtual-Address-Resolu tion-ACKX'08'Forwarded-NPDUX'09'Register -Foreign-DeviceX'0A'Delete-Foreign-Devic e-Table-EntryX'0B'Secure-BVLLX'0C'Distri bute-Broadcast-To-Network bacnet /IPv6 Packet0x82 BVLC TypeBVLC FunctionLength (inclusive)Optional BVLC dataOptional NPDUO ptional APDU2 octets, most significant octet first, includes BVLC Type and octetVaries depending on the BVLC Function1 octet