Echelon SmartServer 2.2 - Manual (Page 177)

178 Using the SmartServer Web Interface
L ON W ORKS connections created in standalone mode are subject to different binding constraints to
permit peer-to-peer connections in networks that using meshing. L ON W ORKS connections created in
standalone mode must be defined from by selecting the output network variable on a device, and then
one or more input network variables on other devices from the navigation pane. One networks using
meshing, devices must include appropriate numbers of alias tables and address table entries.
Acknowledged, Unackownledged, and Repeated service are support if an output network variable is
connected to a single input network variable. If an output network variable is connected to more than
one input network variables on other devices, the only supported LonTalk services are Repeated and
Unacknowleged.
Standalone networks with meshing use group LonTalk addressing to update targets that can be reached
directly. If the SmartServer determines some destination devices must be reached via repeating agents,
the SmartServer will create special reverse proxy connections to the SmartServer that are repackaged
in a new transaction that is broadcast through necessary agents to reach the remaining devices. This
can create a flood of power line traffic which must considered when designing such systems. The
reverse proxy support limits network variable updates to only include non-idempotent data—that is the
updates must be limited to updates that can be received multiple times. For example, an update to set a
light to a level is idempotent, whereas an update to increment the level of a light by 20% is not since
multiple increments will result in a different level than a single increment.
To create a L ON W ORKS connection, follow these steps:
1. If your running the SmartServer in an OpenLNS managed network, do the following:
a. Verify that EES 2.2 and OpenLNS Server have been installed on your computer. See Chapter
1 of the Echelon Enterprise Services 2.2 User’s Guide for how to perform these installations.
b. Verify that an OpenLNS Server has been added to the LAN in order to setup the LNS Proxy
Web service on your SmartServer. See Adding an OpenLNS Server to the LAN in Chapter 3
for how to add an OpenLNS Server to the LAN and setup the LNS Proxy Web service on
your SmartServer.
2. From the SmartServer tree or OpenLNS tree in the left frame of the SmartServer Web interface,
right-click a hub (source) network variable and then click Add Connection in the shortcut menu.
3. The Configure – Web Connection Web page opens and the hostname of the SmartServer or
OpenLNS Server and the OpenLNS network database in which the hub network variable is stored
appear under the Web Connection Destinations icon in the application frame to the right.