The DishPro version of that (which has two connectors) defaults to 110° on one connector and 119° on the other connector at power-up.
- if you command diseqc switch 1 or 2, you can select either of the two LNBs from either connector.
I don't recall the details beyond that.
Your DishProPlus does the same but has several additional features.
- it draws considerable power and may not be suitable for connecting to an FTA receiver.
- The third connector is an input for a "wing dish" or third LNB (bandstacked).
I believe diseqc #3 will select that input, but I don't know.
I would not involve this LNB in my system.
It's really meant to be used with Dish Network receivers.
If you want to get NASA or Angel One on their 119° bird, I suggest a single Legacy or DishPro (bandstacked) LNB as it will integrate with your FTA switches, LNBs, and dishes much better.
Please see the
Switches Simplified FAQ for more info on switch configurations.