I want to use this terminal block on my PCB. However, the schematic and PCB footprint Mouser provides are unclear to me. Why are there 4 pins and what is my signal and ground pin? The data sheet does not provide any detail either.
EDIT: To provide more context about what I am looking at; this is the footprint Mouser provides:
There aren't four pins. You're seeing an image of the series of connectors which shows a three-pin version on the right and a side-view on the left:
The connector you order will only have two positions based on the part number 1776244-2. If you click "3D Customer View Model" you can see that the actual part just has two positions as per the description:
Ground and signal are whatever pins you decide. The connector is completely ambivalent about what you assign.
One final note, I think you mean "datasheet" when you say "schematic." In this context, "schematic" would mean an electrical circuit diagram showing how components are interconnected. If you were following a schematic for an existing product or design, then assignment of signal and ground to connector pins would be important.
Mouser is offering you an incorrect footprint. You'll need to remove the extra pins yourself. Make sure the print is otherwise correct.
It is a two pin device, there should not be 4 holes in the PCB or 4 pins on the schematic symbol.
