Echelon LNS - Manual (Page 181)

LNS Programmer's Guide 167
To re-associate a client with the correct network service device and re-attach the client to
the network, follow these steps:
1. Open the system, and get the Network Service Device to be attached to
the network from the NetworkServiceDevices collection.
Set MySystems = MyNetwork.Systems
Set MySystem = MySystems.Item(1)
MySystem.Open()
Set MyNSDCollection = MySystem.NetworkServiceDevices
Set MyNSD = MyNSDCollection.Item(“MyNSD”)
2. Call PreReplace() on the network to be attached to, with the selected
Network Service Device as the sourceNSD element.
MyNetwork.PreReplace(MyNSD)
3. Close the system, and release all references to the system.
MySystem.Close()
4. Close the network, and release all references to the network.
MyNetwork.Close()
5. Call Replace() on the network.
MyNetwork.Replace()
6. Re-open the network.
MyNetwork.Open()
Using Shared Media
A network is said to contain shared media if it shares channels with other independently
managed networks. For example, power line and RF networks often use shared media,
since all networks plugged into the power line (or transmitting over the radio) share the
same media. A network is said to contain private media if only one network
communicates using the channels. Media such as twisted pair is more easily isolated and
tends to be used as private media; however, you can still create a design where multiple,
independent networks share a twisted pair channel.
When determining whether your installation is shared or private, you should consider
whether you intend to share the media with another network, and whether the end-user
may add another network to the media in the future. For example, if the media is power
line, it is likely to be shared, now or in the future, even if you are installing only one LNS
network.
If you are installing a twisted-pair based stand-alone alarm system, then it will probably
always be private. However, networks intended for private use often use a shared high-
performance backbone, for example when connecting multiple buildings on a site. Subject
to the technology used for this shared channel, each network sharing this channel can
use private media, or become a shared media network. Generally, it is desirable to use
private media, due to more efficient network use and simplified installation and
maintenance. For shared backbones using a L ON W ORKS /IP channel, network design
should allow for one virtual L ON W ORKS /IP channel exclusive to each of the participating