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3. Conclusion

March 11, 2011

This entry is part 11 of 11 in the series Lon over IP (709.1/852)

As this article has outlined, the open 852 standard protocol provides many beneficial features for tunneling CN protocols over IP. Because tunneling 709.1 over IP-852 is supported by multiple choices for commercially available routers, the LON systems integrator has the capability to leverage building IT infrastructure much more conveniently and potentially more cost effectively than [...]

2.4 CN over IP Bridging

March 11, 2011

This entry is part 10 of 11 in the series Lon over IP (709.1/852)

Another difficult integration problem is for legacy LON network management devices that do not support LON routers. This prevents connecting remote LON channels using CN/IP routers since there is no way to configure the router. Another application is where the remote CN channels want to share the same subnet, have low traffic and it is [...]

2.3 852 to 852 Bridging Router

March 11, 2011

This entry is part 9 of 11 in the series Lon over IP (709.1/852)

Because 852 is a full featured tunneling protocol, it can be repurposed to solve some uncommonly difficult integration problems. The 852 protocol is not limited merely for routing from a CN channel over IP to another CN channel. But can be used to build multi-tier backbones on IP with routers that route from one IP-852 [...]

2.2 IP LAN for high speed CN backbones

March 11, 2011

This entry is part 8 of 11 in the series Lon over IP (709.1/852)

Since the IP Ethernet LAN channels such 100/1000 Base-T, can support much higher traffic speeds than CN channels, there are well suited as a backbone for large CN installations. This also makes it easy to attach monitoring and management tools. They just need an 852 interface.A n example is show in the figure below.

2. Applications of the CN/IP Routers

March 11, 2011

This entry is part 6 of 11 in the series Lon over IP (709.1/852)

There are two primary applications enabled by 852 CN/IP routers. These are remote connection s of multi-site or multi-building CN networks over a WAN and using an IP network LAN as a high speed backbone for a CN network.

1.5 Configuration

March 11, 2011

This entry is part 5 of 11 in the series Lon over IP (709.1/852)

852 management packets provide both device parameters and channel parameters. Device parameters include information such as: IP address, IP port, Name, and Address of configuration server. A channel is a logical grouping of 852 devices that all can send information to each other. The lines of communication are open in both directions and to all [...]

1.4 852 Protocol Packets

March 11, 2011

This entry is part 4 of 11 in the series Lon over IP (709.1/852)

Two types of packets are used by the 852 protocol. These are CN Data packets and 852 Channel Management packets. Both packets use a common packet header. The payload of a CN Data packet is the 709.1 LPDU (Link Layer Protocol Data Unit) (See diagram below). The payload of a Channel Management packet is configuration [...]

1.3 CN/IP Device Architecture

March 11, 2011

This entry is part 3 of 11 in the series Lon over IP (709.1/852)

The CN/IP device is a more complex connector because is connects two different protocols and may also connect the protocols at different layers. On the IP side, a CN/IP (LON/IP) router operates at the application layer and so is appropriately called an IP Gateway. On the 709.1 side the CN/IP router device operates at the [...]

1.2 IP Tunneling

March 11, 2011

This entry is part 2 of 11 in the series Lon over IP (709.1/852)

The 852 protocol acts as the transport service to convey 709.1 messages over Internet Protocol (IP) networks, i.e. tunnel. As previously mentioned, in 852 parlance the tunneled protocol is a Component Network (CN) protocol. The 852 protocol is a generic tunneling protocol and is not limited to 709.1. However, a particular implementation of the 852 [...]

1.1 Why 852?

March 11, 2011

This entry is part 1 of 11 in the series Lon over IP (709.1/852)

As building automation networks continue to expand in size and complexity the ability to employ building information technology (IT) internet protocol (IP) based infrastructure becomes an important part of a successful integration task. Whether the building automation system (BAS) leverages existing infrastructure or has a dedicated side-by-side system, IT components provide scalability, remote accessibility, and [...]

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