Device Read

When enabled the Boolean Tag that is specified will cause a one time read of OPC data when it transitions from False to True.  Also when this attribute is enabled the normal asynchronous connection is disabled and the item is only polled on the transition from False to True for the Device Read Tag specified.  When a read is performed it informs the OPC Server to do a Device Read from the device to obtain the very latest value at that time.

Note: For standard asynchronous communications this should not be enabled.