First time wiring switches for independent power

I too use K-line's "newer", so to speak, O27 42" and 27" switches.  Have for years now.

I use the remote power posts on my MRC dual 270 to power the switches.  It's a constant 14V, which works perfectly for these switches.  I run a wire from the + post to a barrier strip and then from there out to each switch's power post (which you correctly identified).  One note just in case you're not sure: the metal piece that connects the power post to the outmost post must be unscrewed from the power post and swung out of the way.

From there it only takes 2 wires connected to the appropriate 2 of the other 3 posts to get it working, IF you do as I describe below.  You may have to experiment with which 2 posts those are.  I have found, surprisingly, that it's not the same 2 on every switch.  I use an AIU to run the 2 wires to all of the switches from each port.  The "-" post from the trannie goes to the input ports on the AIU.

I have also, before getting DCS, used just the controllers.  I did the same thing with the '+' side of things.  For the controllers, it took a small amount of experimenting to determine how to do this: The controller shoots out 3 wires.  I determined which of those 3 has to be connected to the '-' of the trannie while the other 2 run to the switch it's controlling.  To make it simpler, I kept a barrier strip close to where all of the controllers were.  I ran the '-' wire from the trannie to the barrier stip.  After determining for each controller which wire needed to be connected to the barrier strip, I did that connection and then used the other 2 wires for each controller to run out to the switch it was controlling.

If you don't want to do what I explained and just want to hook up a controller to a switch, you still do as I described with the '+' post and then just hook up the 3 wires from a controller to a switch.  Again, you most likely will have to experiment  to see which wire goes to which post.

Actually simpler to do than explain!

- walt