Echelon i.LON 100 e2 Internet Server User Manual

Page 26

LON 100 Internet Server Programmer’s Reference

3-9

Property Description

The value definition being used by the data point. If the data point is not using a

value definition, or if you defined the property in the input you

supplied to the function, this field will appear blank.

Value definitions are user-defined strings that represent preset values the data

point can be updated to. For example, the value assigned to a value definition

called ON for a SNVT_switch data point might be “100.0 1.” You can create value
definitions for a data point with the DataServerSet function, or with the

LON 100

Configuration Software.

Unit type of the data point. This property is configured based on the network

variable type of the data point.

The current status of the data point. This property is updated in real time by the

Data Server, and can be used when setting up Alarm Generators and Alarm
Notifiers with the

LON 100. You can create Alarm Generators and Alarm

Notifiers with the

LON 100 Configuration Software, or with the SOAP interface.

For information on using the SOAP interface to create Alarm Generators and

Alarm Notifiers, see Chapters 7 and 8 of this document.

The priority level currently assigned to the data point. You can set the priority

level of a data point with the DataPointWrite or DataPointResetPriority functions.

For more information on priority levels, see Data Point Values and Priority Levels
on page 3-5.

The format description of the data point. This determines many factors about the

data point, including the type of values it takes, and its base type. This could be

any standard (SNVT) format type included in the

LON 100 resource files, or any

user-defined (UNVT) format type included in resource files uploaded to the

LON

100. For more information on the

LON 100 resource files, see

i.LON

100 Resource

Files on page 4-8.
The SNVT format types included in the

LON 100 resource files are also listed and

described in the SNVT Master List, which can be downloaded as a PDF by
selecting the Documentation link on Echelon’s Support Web site:

http://www.echelon.com/support

This read-only property is assigned to the data point automatically based on the

data point’s . It defines the base type of the data point,
as defined in the base_type_t enumeration in the BAS_Controller resource files for

the

LON 100.

For more information on the

LON 100 resource files, see i.LON 100 Resource

Files on page 4-8.