WAGO 750-830 Manual page 343

IP Message Tunneling
In addition to BACnet/IP, IP message tunneling is a method for transferring
BACnet messages to a network.
Communication via IP message tunneling takes place via the BACnet tun-
neling router (BTR), which is also designated as "Annex H Router" on ac-
count of its description in the annex of the BACnet Standard.
Implementation between the different communication technologies BACnet
and IP is performed using routing tables, with a combination of BACnet
network numbers and IP addresses. The BACnet protocol requires an Annex
H router in both local area networks in order to send a message from one de-
vice to another one on a different network. The Annex H router for the first
network transfers the BACnet message to a UDP (User Datagram Protocol)
frame and transmits the message over standard IP links, or over the Internet
to the Annex H router in network 2.
This router then "unpacks" the incoming data packet and sends the message
to the destination device via the BACnet protocol.
BACnet devices do not require IP compatibility for IP message tunneling via
BTRs. BTRs are frequently used in existing BACnet networks that have a
link to IP networks, to an intranet or to the Internet.
ISO/OSI (Open Systems Interconnection) Model
The ISO/OSI model is a reference model for networks, with the goal of cre-
ating open communication. It defines the interface standards of the respec-
tive software and hardware requirements between computer manufacturers.
The model treats communication removed from specific implementations,
using seven layers. The model treats communication removed from specific
implementations, using seven layers: 1 -Bit transfer layer, 2 -Backup layer, 3
-Transfer layer, 4 -Transport layer, 5 -Session layer, 6 -Presentation layer
and 7 -Application layer.
K
KNX
KNX has been established as a flexible bus system for building automation
and has been standardized by the KNX Association in ISO/IEC 14543. KNX
was developed by the European installation bus (EIB), BatiBUS and Euro-
pean Home Systems (EHS). In addition to twisted pair, other transmission
media, such as powerline, radio and links to ETHERNET ("KNXnet/IP") are
also supported.
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Glossary • 343