AsyncRead performs an asynchronous read of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.

AsyncWrite performs an asynchronous write of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.

CancelLastAsyncCall requests that the server cancels the last outstanding AsyncRead or AsyncWrite transaction.

TdOPCGroup

This is Destroy, a member of class TdOPCGroup.

fills EUInfo and EUType for all items in this group
GetEUInfos fills the properties EUInfo and EUType for all items either in the group or, if it is not nil, in the parameter aItemList.

GetState fills the parameter GroupState with the current state of the group.

Refresh generates an event for all active items in the group (whether they have changed or not) to refresh their values.

RefreshMaxAge generates an event for all active items in the group that have not changed their values for the duration of the passed MSecs (milliseconds) to renew their values.

This is SetState, a member of class TdOPCGroup.

SyncRead performs a synchronous read of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.

SyncWrite performs a synchronous write of the value, quality and timestamp information for all items either in the group or, if it is not nil, in the parameter aItemList.