Echelon LNS Bedienungsanleitung PDF herunterladen (Seite 251)

LNS Programmer's Guide

237

Table 9.4 Data Source Options

Value Description

lcaDataSourceOptionsNormal

If you use this option to create a DataPoint, or if

you set the SourceOptions property of the

DataPoint to this value later, then the value of

the ConfigProperty will be updated in the LNS

database and in the physical device on the

network each time you write to the value of the

DataPoint.

When you read the value of the DataPoint, the

value will be read directly from the device if the

source ConfigProperty is device-specific.

If the source ConfigProperty is not device-

specific, the value will be read from the database.

If its value does not exist in the database, then the

value will read directly from the device, as long as

the system management is set to

lcaMgmtModePropagateConfigUpdates. If the

source ConfigProperty is not device-specific, the

value is not in the database, and the system

management mode is set to

lcaMgmtModeDeferConfigUpdates, then the

NS#113 lcaErrNsCpValueNotFound exception

will be thrown when you read the value of the

DataPoint.

lcaDataSourceOptionsFromDevice

If you use this option to create a DataPoint, or if

you set the SourceOptions property of the

DataPoint to this value later, then the data point

is read-only. Reading the value of this data point

will always read the value of the source

configuration property on the physical device on

the network.

lcaDataSourceOptionsDatabaseOnly

If you use this option to create a DataPoint, or if

you set the SourceOptions property of the

DataPoint to this value later, then the value of

the data point will always be read from the LNS

database. When you write to the data point, the

new value will only be written to the

ConfigProperty object in the LNS database, and

not to the configuration property in the physical

device. Writing to a DataPoint with the

SourceOptions property set to this value is

recommended only when updating the database

with a value that has just been read from the

device.

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