How can I set the DO line to tristate NI-9472

I am trying to set up a simple frequency sweep using the NI-9472 and I would like to set the DO line into tristate after the sweep is complete.  How can I do this?  I tried adding a DAQmx channel property node and selected tristate for the digital output but the tristate property is an output.

I've got the DO line connected to a scope so I know the sweep is working.  Attached is the test vi