Echelon SmartServer 2.2 - Manual (Page 265)

266 Using the SmartServer as Network Management Tool
4. Configure the following data point properties:
Name Displays the network path of the functional block in the following format:
<network>/<channel>/<device>/<functional block>/<data point>. This
field is read-only.
NV Index Displays the index number of the data point within its device. This field is
read-only.
Selector Displays the value that uniquely associates the data point with its
connections. If the data point is not a member of a connection, the
selector is set to a value representing an unbound data point.
For L ON W ORKS connections, a selector is a 14-bit number used to identify
connected data points. When placing the data point in a L ON W ORKS
connection, the SmartServer assigns the data point a value representing
that connection. All data points in a given connection use the same
selector. The OpenLNS Server shares a network variable selector among
connections if the connections share one or more data points.
You cannot the change the value in the Selector property.
Description Enter an optional description of the functional block. This description has
no effect on network operation, but you can use it to provide additional
documentation for as-built reports.
LON Data Point
Property
Icon Displays the icon used to represent the data point in the SmartServer or
OpenLNS tree and in the application frame. You can change the icon for
the data point by selecting a different icon and then clicking Submit.
Hidden Hides the data point in the SmartServer tree or OpenLNS tree. If this data
point is not actively being used, you can hide it to simplify the web
interface.
To show a hidden data point icon, click Settings. In the Global Settings
dialog, select Data Points in the Display Hidden property and then click
Close.
Poll Rate The frequency in which the SmartServer’s internal data server polls the
data point. recommended typical minimum poll rate is 30 seconds; the
maximum poll rate is 1 second.
The default poll rate for network variables is 120 seconds if the network
variable has been copied and pasted from the OpenLNS tree, or it is 600
seconds if the parent device has been manually added to a channel in the
SmartServer tree. The default poll rate for configuration properties is 0
seconds, which means that means polling is disabled. You must set a poll
rate for configuration properties to update their values.
You can set poll rates for the data points of the external devices that are
connected to the SmartServer. You can set poll rates for the data points of
the internal SmartServer devices if you need to force updates in a specific
SmartServer embedded application (for example, a data logger).
Note: The actual poll rate for a data point is determined by calculating
the greatest common devisor of all the poll rates set for the data point in
the applications to which it has been added.
For example, if a Data Logger polls a data point every 5 seconds, and an
Alarm Generator polls the same data point every 7 seconds, the