Echelon SmartServer 2.2 Uživatelský manuál stáhnout pdf (Strana 266)

SmartServer 2.2 User’s Guide 267

SmartServer’s internal data server will poll the data point every 1 second.

Therefore, set poll rates in the SmartServer’s applications that are the

same for a given data point, or poll rates that are at least multiples of each

other. For example, if a Data Logger polls a data point every 5 seconds,

and an Alarm Generator polls the same data point every 10 seconds, the

SmartServer’s internal data server will poll the data point every 5 seconds

Direction

Indicates whether the data point is an input data point or output data point.

For dynamic data points, you can change the direction.

Static/Dynamic

Indicates whether the data point is static, dynamic, or has a changeable

type (DDT_changeable). If the data point supports changeable types or is

dynamic, you can change the type/and or format in the Format

Description box.

Use

Authentication

Enables the data point to use authenticated messaging.

NV Attribute

Length

Specifies the size (in bytes) of the data point.

Formatting

Parameters

Format

Description

Displays the SNVT, UNVT, SCPT, or UCPT used by the data point, and it

specifies the format (for example, SI metric or US customary) used if the

type has multiple formats such as SNVT_temp_f. The format description

is displayed in the following format: #<manufacturer ID>[scope

selector].<type name>.

For data points with multiple formats such as SNVT_temp_f, you can

click the arrow to the right to select a different format defined for that data

type from the list that appears. Using a SNVT_temp_f data point for

example, you can click the arrow to change the format to #US, #SI, or

#US_Diff.

For dynamic data points or data points with changeable types, you can

click the box to the right to open the Select Types dialog, where you can

change the data point’s type and/or format. In the Select Types dialog,

you expand the LonMark Resource directory, expand the lonworks/types

folder, and then expand a LonMark resource file to show the network

variable and configuration property types available in that file. You then

expand the network variable or configuration property types to show the

available data types, click the SNVT, UNVT, SCPT, or UCPT to be used

for the data point, and then click OK to return to the Setup – LON Data

Point Driver Web page.

Note: This Select Types dialog does not filter data types with the different

lengths as the current data type of the selected data point.

4. Click Submit.

Viewing LONWORKS Data Points

You can use the Overview – Data Points Web page to view or configure the indexes, statuses, names,

types, unit strings, and poll rates of the LONWORKS data points within the devices and functional

blocks in your network. To view LONWORKS data points with this Web page, follow these steps:

1. To rename or set the poll rates for data points, click the Driver option at the top of the navigation

pane on the left side of the SmartServer Web interface.

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