Echelon SmartServer 2.2 - Manual (Page 261)

262 Using the SmartServer as Network Management Tool
the VirtCh channel have default alias names that begin with the
“iLON System” prefix. In the e3 release of the i.LON software, these
data points were referred to as “NVVs”.

The data points of the external devices connected to the SmartServer
do not have default alias names, and this property is initially disabled
for these data points. In the e3 release of the i.LON software, these
data points were referred to as “NVEs”.
Persistent Enables the current value stored in the data point to persist through a
SmartServer reboot. Selecting this option enables the Use Default Value
property and stores the current data point in it. Configuration properties
are marked as persistent by default.
Use Default Value Enables you to define a default value that the data point will use if the
SmartServer is reset. To set a default value, select this option and enter a
value. If this check box is cleared, the data point value will be set to 0 and
its status will be set to AL_NUL when the SmartServer is reset.
Use Invalid Value Enables you to define an invalid value that if reached, the data point status
is set to AL_INVALID. You can have an Alarm Notifier send an alarm
notification any time this occurs. See Alarming in Chapter 7 for more
information on how to do this.
Format
Description Displays the data point’s program ID; data type (SNVT, SCPT, UNVT,
UCPT, or built-in data type); and format (for example, SI metric or US
customary if the type has multiple formats such as SNVT_temp_p). The
format description is displayed in the following format: #<manufacturer
ID>[scope selector].<type name>.
For data points with multiple formats such as SNVT_temp_p, you can
change the format used for the data point in the Format Description
property on the Setup - LON Data Point Driver Web page.
For dynamic data points or data points with changeable types, you can
change the data point’s type and/or format from the Setup - LON Data
Point Driver Web page. To do this, click Driver and then click the box
to the right of the Format Description property. The Select Types dialog
opens and you can select a different type and/or format for the data point.
Unit String For scalar and enumerated data points, 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, displays the fields within the data point. Using
a SNVT_setting data point for example, function, setting, and rotation is
displayed in this property. You can edit the unit strings of the fields of a
structured data point in the Fields property located at the bottom of this
Web page.
By default, the Unit String option is selected, meaning that the unit string
is displayed on the SmartServer Web pages. You can edit the unit string
and the revised unit string will appear in the SmartServer Web pages.
You can clear Unit String to disable the appearance of the unit string.
Note: To use the double quote (“) character in a unit string, you must
escape it with another double quote. For example, to use a single double
quote character to represent inches, enter two double quotes (“”). If you do
not escape the double quote, the Data Logger: View Web page may not
display the data point value.