Echelon SmartServer 2.2 - Manual (Page 176)

SmartServer 2.2 User’s Guide 177
Repeat this step to connect the selected source data point to any other desired compatible target
data points.

If the target data point is not compatible with the source data point a warning message
appears. You can delete the connection by right-clicking the reference to the target data point
on the SmartServer tree in the left frame and clicking Delete on the shortcut menu. See
Deleting Connections in this section for more information on how to do this.

You can also check whether a Web connection is valid by right-clicking the reference to the
target data point on the SmartServer tree in the left frame and clicking Validate on the
shortcut menu. The Web Connection Validation Results dialog opens and displays the
results. See Validating Connections in this section for more information on using this dialog.
5. Select Acknowleged Web Connection for the service type. This means that the sending device
expects to receive confirmation from the receiving device that a data point update was delivered.
The sending application is notified when an update fails, but it is up to the developer of the
sending device to handle the notification in the device application.
6. Click Submit. Each time the value of the selected source data point is updated, the SmartServer
now sends a request message to the Webbinder Destination. Upon receiving the request message,
the Webbinder Destination updates the selected target data points to the value specified for the
source data point in the request message.
7. You can configure the Web connections you have created by clicking Driver, and then selecting
one or more of the target data points under the source data point in the SmartServer tree. See
Configuring Connections in this section for more information on how to do this.
8. If you created an internal connection, peer-to-peer connection, or LNS uplink connection, you can
add the source and target data points to the View – Data Points Web page and test that the Web
connections are updating the data points accordingly.
If you created an enterprise connection, you can attach a data log, alarm log, event scheduler log,
or any user-defined file stored on the SmartServer to the connection. To do this, you right-click
the reference to the target data point on the SmartServer tree in the left frame and click Add
Attachment on the shortcut menu. You can select the file to be attached to the connection in the
Select Attachment File dialog. See Adding File Attachments in this section for more information
on how to do this.
Note: If multiple source data points of Web connections use different dial-up connections, you must
ensure that the source data points are not updated so frequently that the first PPP connection is never
dropped. If data is being sent over a dial-up connection at a faster rate than the timeout for the
connection, the connection will never be dropped, and a new connection can never be made. This can
result in a situation in which the SmartServer will be unable to update a Web connection over a second
dial-up connection. See Creating Modem Connections in Chapter 3 for more information on using
dial-up connections.
Creating L
ON
W
ORKS
Connections
You can create L ON W ORKS connections in an LNS managed network or a standalone network to bind
the network variables of L ON W ORKS devices that are in the same network database. Creating
L ON W ORKS connections with the SmartServer is comparable to creating connections with OpenLNS
CT. You select a hub network variable in the OpenLNS tree and then select one or compatible target
network variables in the same network. Network variables must have the same type to be compatible.
Once you create L
ON W ORKS connection, the target data points will receive all updates from the hub
(source) in the connection. This process of connecting network variables is called binding, and the
logical connections are thought of as virtual wires.
L ON W ORKS connections created with the SmartServer in LNS mode always use Subnet/Node ID
addressing. You can use an OpenLNS application such as OpenLNS CT to select a different
addressing mode such as group or broadcast for L
ON W ORKS connections.