Opc data Access Automation Specification

4.5.3

 

OPCItems Properties 

4.5.3.1

 

Parent  

Description 

 (Read-only) Returns reference to the parent OPCGroup object. 

Syntax 

 Parent As OPCGroup 

4.5.3.2

 

DefaultRequestedDataType 

Description 

 (Read/Write) The requested data type that will be used in calls to Add. This property defaults to 

VT_EMPTY (which means the server sends data in the server canonical data type). 

Syntax 

 DefaultRequestedDataType As Integer 

Remarks 

 Any legal Variant type can be passed as a requested data type.  

See Also 

Appendix A - OPC Automation Error Handling 

Appendix D- Notes On Automation Data Types 

Example 

VB Syntax Example (getting the property): 

Dim CurrentValue As Integer 

Dim SomeValue As Integer 

CurrentValue = AnOPCItemCollection.DefaultRequestedDataType 

VB Syntax Example (setting the property): 

AnOPCItemCollection.DefaultRequestedDataType = SomeValue