Echelon i.LON 100 e2 Internet Server - Manual (Page 67)

i. LON 100 Internet Server Programmer’s Reference 5-23
Property Description
If the value of a field was requested in the parameter, this
property contains the name of the field.
A timestamp indicating the last time the value of the data point
was updated. This timestamp is expressed in local time, with an
appended time zone indicator that indicates the difference
between local time and Coordinated Universal Time (UTC). UTC
is the current term for what was commonly referred to as
Greenwich Meridian Time (GMT). Zero (0) hours UTC is midnight
in Greenwich England, which lies on the zero longitudinal
meridian. Universal time is based on a 24 hour clock, therefore,
an afternoon hour such as 4 pm UTC would be expressed as 16:00
UTC. The timestamp uses the following format:
[YYYY-MM-DD]T[HH:MM:SS.MSS]+/-[HH:MM]
The first segment of the timestamp [YYYY-MM-DD] represents
the date. The second segment (T[HH:MM:SS.MSS]) of the
timestamp represents the local time, expressed in hours, minutes,
seconds and milliseconds. The third segment (+/-[HH:MM])
represents the difference between the local time listed in the
second segment and UTC. This segment begins with a + or a -.
The + indicates that the local time is ahead of UTC, the - indicates
the local time is behind UTC. Consider the following example:
2002-08-13T10:24:37.111+02:00
This timestamp indicates a local date and time of 10:24 AM and
37.111 seconds, on August 13, 2002. Because the third part of the
segment reads +02:00, we know the local time here is 2 hours
ahead of UTC.
The current value of the data point.
The value definition currently being used by the data point. Value
definitions represent preset values. They can be created with the
i. LON 100 Configuration Software, or the DataServerSet function.
You can use these value definitions to update the value of the data
point other i. LON 100 applications such as the Event Scheduler or
the Alarm Notifier reference it.
Unit type. This property is configured based on the network
variable type of the data point.
The current status of the data point. This can be used when
setting up Alarm Generators and Alarm Notifiers with the i. LON
100. For more information on these applications, see Chapter 7,
Alarm Generator, and Chapter 8, Alarm Notifier.
The priority level currently assigned to the data point (0-255). The
priority level of a data point determines which applications have
write access to it. You can modify the value of this property with
the DataServerWrite or DataServerResetPriority functions.
For more information on priority levels, see Data Point Values
and Priority Levels on page 3-5.