Measurement-computing ScanServer rev.2.0 Manuel d'utilisateur télécharger pdf (Page 39)

ScanServer User's Guide Glossary 37

Glossary

AdvanceDDE

Rockwell Software’s highly optimized DDE format; capable of

transferring multiple data items efficiently in a single DDE message.

Advise

A DDE service that receives the specified data item from the module

continually as it changes.

Background Poll

Rate

The rate at which ScanServer queries the module for static data (e.g., unit

ID).

CF_Text

A standard DDE format for transferring data between a DDE Server and a

DDE Client; designed to transfer a single ASCII text string in a DDE

message.

Communication

Protocol

Mechanism or network that ScanServer uses to communicate with the

ScanServer instruments (RS232/RS422 or RS485).

DDE Client

A Windows application that requests services from a DDE Server.

DDE Server

A Windows application that provides data services to a DDE Client.

DDE

Dynamic Data Exchange; Microsoft’s standard inter-process

communication protocol; a mechanism for transferring data between

applications.

FastDDE

WonderWare’s highly optimized DDE format; capable of transferring

multiple data items efficiently in a single DDE message.

Foreground Poll

Rate

The rate at which ScanServer queries the module for constantly changing

data (e.g., meas1).

Item

Defines the specific data sent to or received from a DDE topic through the

DDE Server (e.g., time or meas1)

Poke

A DDE service that sends data to the module through the DDE Server.

Project

A mechanism for saving and recalling a group of configured nodes; stored

as a .cfg file.

Request

A DDE service that receives the specified data item from the module

through the DDE Server.

Node

Defines a ScanServer instrument, including its name, communication

protocol, and foreground and background poll rates.

XL_Table

An optimized DDE format for transferring multiple cells of data between a

DDE Server and Microsoft’s Excel in a single DDE message.

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Measurement-computing ScanServer rev.2.0 Manuel d'utilisateur Page 39

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