Echelon SmartServer 2.2 - Manual (Page 418)

SmartServer 2.2 User’s Guide 419
page, which you can access by clicking the data point in General mode.
4. Select the Show Advanced check box to view the following properties used to configure the
frequency in which data is logged.
Minimum Delta
Time Displays the minimum period of time that must elapse between log entries.
The default value is 15 minutes. This means that the data logger will record
the data point’s value every 15 minutes.
Minimum Delta
Value Displays the minimum change in value required between log entries to
record the data point. If this property is set to 0, the data logger records the
data point every time its value changes, regardless of the amount of change.
5. To configure how the data logger records the values of the selected data points, click the Poll Rate
or Min. Delta Time box for any data point. The Logging dialog opens.
6. Select whether the data logger uses polling and/or event-driven updates to record the values of the
selected data points.

Select Log on Poll Rate to have the Data Logger record the values of the data points at a
specified rate. In the Poll Rate property, enter a value and then select a measurement of time
(seconds, minutes, hours). The default poll rate is 15 minutes.

Select Log on Updates to have the Data Logger record the values of the data points when
they change.
o In the Min. Delta Time property, enter the minimum period of time that must elapse
between log entries. Enter a value and then select a measurement of time (seconds,
minutes, hours). The default minimum delta time is 15 minutes, which means that the
data logger will record the data point’s value every 15 minutes, regardless of how
frequently the value changes between intervals.
o In the Min. Delta Value property, select the minimum change in value required between
log entries to record the data point. The default minimum delta value is Always, which
means that the data logger always receives data point updates, regardless of whether the