Echelon SmartServer 2.2 - Manual (Page 268)

SmartServer 2.2 User’s Guide 269
read-only.
Functional Block Displays the name of the data point's parent functional block. This
field is read-only.
Dp Displays the name of the data point. In Driver mode, you can
change the name. In General mode, this field is read-only.
Format
Description Displays the SNVT, UNVT, SCPT, or UCPT used by the data point,
and it specifies the format (e.g., SI metric or US customary) used if
the type has multiple formats such as SNVT_temp_f. The format
description is displayed in the following format: #<program
ID>[scope selector].<type name>.
For data points with multiple formats such as SNVT_temp_f, you
can click the arrow to the right to select a different format defined
for that data type from the list that appears. Using a SNVT_temp_f
data point for example, you can click the arrow to change the format
to #US, #SI, or #US_Diff.
For static data points with changeable types or dynamic data points,
you can change the data point's type and/or format in the Select
Types dialog that you can open from the Format Description
property in the data point's Setup – Data Point Driver Web page.
To open this Web page, click the Driver option above the
navigation pane on the left side of the SmartServer Web interface,
and then click the data point.
This property is only displayed in Driver mode; it is not displayed
in General mode.
Unit Displays the units of measures used by the data point. For example,
the unit string of a SNVT_temp_f data point is “degrees F.” The
unit string is defined by resource files. For structured data points,
this displays the fields within the data point. Using a SNVT_setting
data point for example, function, setting, rotation is displayed in this
property.
You can edit the unit strings in the data point's Configure - Data
Point Web page. To open this Web page, click the General option
above the navigation pane on the left side of the SmartServer Web
interface, and then click the data point. The Unit String property is
located in the upper portion of the Web page.
This property is only displayed in Driver mode; it is not displayed
in General mode.
Poll Rate The frequency in which the SmartServer's internal data sever polls
the data point. The typical minimum poll rate is 30 seconds; the
maximum poll rate is 1 second.
The default poll rate for external data points is 120 or 600 seconds.
It is 120 seconds if the data point has been copied and pasted from
the OpenLNS tree. It is 600 seconds if the parent device has been
manually added to a channel in the SmartServer tree.
The default poll rate for the data points of the SmartServer's internal
devices (i.LON App and iLON System) is 0 seconds, which means
polling is disabled. You can set poll rates for the internal data
points if you need to force updates in a specific SmartServer
embedded application (e.g., a data logger).