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Do you have an application sheet showing the wiring of a digital input on the power input plug. Including a switch and necessary resistors with the settings required to send SMS to a group on contact closure.

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No sheets or schemes are needed for this to be done.

Please read this wiki page fully: https://wiki.teltonika-networks.com/view/RUT240_Input/Output

There you will find that it's enough to power the input pin and on high level you can set that router would send the SMS.

I think the answer is a bit too short.

I would like to know more about how the input pin behaves.  Particularly if a pull-down resistor is needed on the input? or stated in another way, can I trust the port to read LOW if port is floating (unconnected)?
How about ground of digital input? where and how can I connect ground of digital input?