DDE Client Driver Specs

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DDE Client
Communications Schematic:
DDE Client/OPC Server diagram

Supported Devices

Device	Note
Can be used with any DDE server that supports standard Microsoft DDE.	See Notes for more information.

Communications Protocol

Notes

The DDE Client Driver is capable of communicating with any server that supports the standard "CF TEXT" DDE data format.
Clients may reside on remote machines and communicate with this driver via OPC or NetDDE. However, the current version of this driver cannot access data from DDE servers running on remote machines.
The driver will automatically reconnect when DDE servers are brought back on-line.
A "ReinitializeDDE" tag is provided to aid in the resolution of DDE communication failures.
This driver uses "hot links," where a DDE server passes data to the driver only when the data value has changed. This provides a significant performance advantage over the alternative request/response loop approach since each DDE transaction is relatively time consuming.
Addressing uses familiar "ApplicationName| TopicName ! ItemName" method for DDE server data.
All major data types are supported.

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Last site update July, 2008