Echelon i.LON SmartServer Technical Information Page 49

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i.LON SmartServer 2.0 Programmer’s Reference
4-8
Property Description
standard (SNVT) format type included in the resource files on
the SmartServer, or any user-defined (UNVT) format type
included in resource files uploaded to the SmartServer. For
more information on the resource files, see
SmartServer
Resource Files.
If you do not set this property, it is set to RAW_HEX and the
data point uses raw hex values.
The SNVT format types included in the SmartServer resource
files are also listed and described in the SNVT Master List,
which can be downloaded from Echelon’s Support Web site at:
www.echelon.com
<UCPTlength>
Specifies the size (in bytes) of the data point.
<UCPTdirection>
Specifies whether the data point is an input data point (DIR_IN),
output data point (DIR_OUT), or has an unspecified direction
(DIR_NUL).
<UCPTpersist>
A flag indicating that the value stored in the data point persists
through SmartServer reboots. If this property is set to 1, the last
data point value is stored in the <UCPTdefOutput> property.
Configuration properties are marked as persistent by default.
<UCPTdefOutput>
Optional. The value to be assigned to this data point after a
power-up of the device or during an override of the functional
block.
For external data points and slave devices, Echelon does not
recommend that you define this property, as the value entered
here will be sent to the external device after a power-on.
Note: You can use the Set function to change this value in the
Data Server. However, you must program your application to
enforce the new value, as the SmartServer will continue to
enforce the default value taken from the resource files.
<UCPTunit>
This property is a string up to 227 characters long that describes
the units the value in which a data point is measured. It is based
on the network variable type assigned to the data point. A
default value will be assigned to this property if a unit for the
network variable type chosen for the data point exists in the
resource files on the SmartServer.
For scalar and enumerated data points, this property specifies
the units of measures used by the data point. For example, the
unit string of a SNVT_temp_f data point is °F. The unit string
is defined by resource files.
For structured data points, the fields within the data point are
specified in a series of <UCPTunit> properties if the unit strings
can be edited. Using a SNVT_switch data point for example,
value and state fields will be specified in a series of
<UCPTunit> properties with their respective units of measure
(“% of full level” and “state code”). You can use the Set
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