Sets the edge triggering properties. An edge trigger occurs when the trigger signal that the end-user specifies in the Trigger Source input passes through the voltage threshold that the end-user specifies in the Trigger Level input and has the slope that the end-user specifies in the Trigger Slope input. This node affects instrument behavior only if the IviDigitizer Trigger Type property is set to edge trigger. Set the IviDigitizer Trigger Type property and the IviDigitizer Trigger Coupling property before calling this node. If the trigger source is one of the analog input channels, an application program should configure the vertical range, vertical coupling, and the maximum input frequency before calling this node.