The terms committed and uncommitted switch are important when you're going to use multiple switches between the receiver and the LNB's. An example might be a setup with four quattro LNB's connected to a multiswitch (committed) and also four single LNB's to a simple switch. For a tuner to be able select every LNB, you need to connect the multiswitch (committed) to the simple switch (uncommitted) and connect the simple switch to the tuner.
In that case, you need to use two switches, only one of them can be a committed switch (always next to the LNB's) and only one of them can be an uncommitted switch.
It is possible to only use a single uncommitted switch or a single committed switch, that's no problem.
What you have is either a committed or an uncommitted switch, but it doesn't matter in this case.
Then, the USALS or "rotor emulation mode". I don't think you should use it. It's for receivers that don't understand DiSeqC 1.1. All Enigma receivers do understand DiSeqC 1.1 though, so you should use that mode.
Your LNB's are simple single LNB's I guess, so they should be put in hi/lo and vertical/horizontal mode using tone burst and voltage (13V/18V). Then send DiSeqC commands to select an input. Some switches can simply use "uncommitted" input 1 - input 16, other switches can only use "committed" inputs AA/AB/BA/BB in combination with "uncommitted" inputs 1 - 16. The manual of your switch should explain what to use.
For this to work you really need to select "advanced mode" of the tuner.