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LNS Programmer's Guide

192

Section Description

Using Configuration Properties

In a Monitor and Control

Application

In some cases, you may want to write an

application to control the values of the

configuration properties on the devices on your

network. This section provides guidelines to follow

when doing so.

Data Formatting

This section describes how your application can

format the data it obtains through monitor points

and data points.

Temporary and Permanent Monitor Sets

As of LNS Turbo Edition, there are two separate types of MonitorSet objects:

permanent MonitorSet objects, which can be used in multiple client sessions, and

temporary MonitorSet objects, which can only be used in a single client session. This

section describes when you should use each type.

Permanent Monitor Sets

Each Network object contains a MyVNI property, which returns an AppDevice object

representing your application’s Network Service Device. You can use this AppDevice to

access all the MonitorSet objects that are stored in the LNS database for your Network

Service Device (i.e. the monitor sets that have been created for applications running on

your PC). Echelon recommends that you use the MyVNI property to access MonitorSet

objects when you need to create or modify the configuration of the MonitorSet objects.

To access MonitorSet objects for actual monitor and control operations, you should use

the CurrentMonitorSets property of the Network object.

The CurrentMonitorSets property returns a collection of all the MonitorSet objects

on the network that are currently stored in your Network Service Device. This will be

useful if you have created monitor sets while the system management mode is set to

lcaMgmtModeDeferConfigUpdates. Although those monitor sets exist in the LNS

database (and can be accessed through the MyVni property), they will not be

commissioned into the Network Service Device, and cannot be enabled or used for

monitor and control operations until the system management mode is set to

lcaMgmtModePropagateConfigUpdates. When the system management mode is set to

lcaMgmtModePropagateConfigUpdates, the new monitor sets will be commissioned

into your Network Service Device and added to the CurrentMonitorSets collection,

and the CurrentMonitorSets collection will contain the same collection of monitor sets

as the MyVni collection.

The collection accessed through the CurrentMonitorSets property allows access to all

the monitor sets you can currently use on a network. The collection accessed through the

MyVni property allows access to these monitor sets, and those not yet commissioned into

your Network Service Device. All the monitor sets obtained through the

CurrentMonitorSets property are runtime monitor sets, meaning that you can open

them and enable them for monitoring operations. However, you cannot change their

configuration when you access them through the CurrentMonitorSets collection. As

noted previously, you should use the collection obtained through the MyVni property

when you need to change the configuration of your client’s local MonitorSet objects.

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