This is the ugly back-side of the nicer looking RT fence seen in other pictures. (It is NOT in any working position as pictured!!!!!)
I share it to point out the design. Most things are obvious, but I would point out the two blocks on either end of the back side. Those can be used to clamp the fence to the TS fence and use the TS fence to position and secure the RT fence.
On the RT shown, I use "toilet" bolts in the T-track on either side of the RT. They are tightened down by the knobs.
The DC port works great with my shop vac. Since adding the DC cab, I find I don´t really need to use that port, however.