Classes
| Class | Description | |
|---|---|---|
 | DAControlDef | Definitions for binding a Windows control to an OPC item handled in the DAGroup class. |
| DAGroup | Available in the OPCDA.NET Professional Edition only. This invisible control provides convenient access the OpcGroup object. Read, Write functios and and data change handling is supported. The parameters needed for a read/write call for multiple items can be defined in the Visual Studio Designer. In write calls the value can be easily filled into the prepared parameter structures. Data change callbacks can be configured to write the value into a control property (e.g. textBox.Text) or passed to a user handler assigned on an item base. |
| daHost | Host definitions for the OPC server access. It includes the network name of the computer no which the OPC server resides and access credentials. |
| DAItemSet | The DAItemSet is a collection of DAItemValue object that can be used in Read and Write methods of the DAGroup class. |
| DAItemSets | Collection of DAItemSet objects. |
| DAItemValue | Holds the item value, quality, timestamp and item identification information. |
| DAOpcItem | Defines an OPC server item in the DAGroup class. |
| DAOpcItems | Collection of item definitions |
| DAServer | Available in the OPCDA.NET Professional Edition only. This invisible control handles the OPC server access for a number of DAGroup controls. The server access is done in background threads using the OPCDA.NET BGServer class. Server access is made at least once in the defined interval to check that the server is still responding. Async server responses are time out checked and the callbacks are synchronized with the defined Windows Form object to ensure proper access to Windows controls. |
Delegates
| Delegate | Description | |
|---|---|---|
 | DADataChange | Delegate of the user data change event handler |
| DAGenericNotification | The daGeneralNotification handler is called when an error happens and the user did not pass a specific completion notification handler. |
| DAReadComplete | DAGroup Read Complete event handler |
| DaRequestCompleted | Complete event handler for different DAServer and DAGroup methods. |
| DAWriteComplete | DAGroup Write Complete event handler |
| PingFailureEventHandler | Event handler that is called when the ping thread detects a server access failure |