There's two ways to power a TIU - either through Fixed 1 or by using an auxillary power supply of the proper specifications fed to the TIU through the Aux port. If you use aux power then you do not have to do anything with the Fixed Inputs - you can just connect to the Variable ports and your TIU should have power. If you feed power only to a Variable port the TIU will not be powered up.
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