Echelon i.LON 100 e2 Internet Server User Manual
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LON 100 Internet Server Programmer’s Reference
5-13
The DataServerGet function returns an element for each data point referenced in the
parameter you supplied to the function. The properties included within each element are
initially defined when the data point is added to the DataServer. You can write to them with
the DataServerSet function. Table 10 describes these properties.
For more information on the DataServerSet function, see DataServerSet on page 5-17.
Table 10 DataServerGet Output properties
Property Description
The index number assigned to a data point must be in the range
0-32767. As mentioned earlier, you can use the DataServerSet
function to create a new NVC data point, or to modify an
existing NVL or NVC data point. If you do not specify an index
number in the parameter you supply to DataServerSet,
the function will create a new data point using the first available
index number.
If you specify an index number that is already being used, the
function will overwrite the configuration of the data point using
that index number with the settings defined in the
parameter.
The name of a data point can be a maximum of 31 characters
long, and must begin with the following prefixes:
• NVL_ for an NVL data point
• NVC_ for an NVC data point
Once you have added a data point to the Data Server, you can
not change its
property for all data points must be unique, and must not
contain any spaces.
Note: The names assigned to NVL data points in the Data
Server follow the naming convention NVL_[NAME], where
[NAME] represents the progammatic name assigned to the NV
when it was created with LONMAKER. You can determine the
progammatic name of a network variable in LONMAKER by
right-clicking it and selecting Properties.
An alphanumeric string of up to 128 characters that describes
the location of the data point. This field is user-defined, and may
be useful when organizing your data points by physical location
or device.
A description of the data point. This can be a maximum of 228
characters long.