Echelon OpenLNS Commissioning Tool - Manual (Page 137)

OpenLNS CT User’s Guide 121
To view the properties of a connection description, select the connection description from the Name
list. If you do make changes, click OK and OpenLNS CT then updates all network variable members
of the connection with the modified connection description
To create a new connection description, click New. The New Connection Description dialog box
opens.
Enter the name of the new connection description and select whether the currently displayed or default
attributes are used, and then click OK. Make any desired changes to the attributes of the new
connection description and then click OK. The new connection description will appear in the Name
list in the Network Variable Connection dialog box.
Using Automatic Connection Description Selection
You can use OpenLNS CT to automatically select the connection description for network variable
connections. OpenLNS CT will select the connection description that optimizes network performance,
while providing reliable message delivery and minimizing network resource usage.
To support automatic connection description selection, the pre-defined connection descriptions include
smart connection descriptions (SCDs) . When a smart connection description is assigned to a
connection, OpenLNS CT automatically selects the appropriate SCD when a connection is created or
changed. OpenLNS CT determines the appropriate SCD based on the number of target network
variables, whether the target network variables are located on the same or different subnet, and the
availability of network variable aliases.
The following flow chart demonstrates the process OpenLNS CT uses to select the appropriate SCD.