Setting for High Impedence Mode

What is the setting for causing a TriState port to go into high impendenc (disconnected) mode?

I’m trying to implement a Charliplex on my Domino, however multiple leds are being lite up. I’ve alread tested the wiring; it’s not that.

Input=high impedance

So then, when implementing the code, I set all the pins to input (high impendence) then the pins I want to control i set as output then true (for source) and false (for sink)?

Its working, thanks gus!