Measurement Computing ScanServer rev.2.0 - Manual (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.