I'm afraid that I have no idea as to what can be done, what is normally done or what is 'standard practice' - but, as I said, thinking just on a 'common sense' basis, there would be little point in remotely activating the lock of a door/gate if it were not 'properly closed', so it would be nice to have some means of confirming that it was closed!I didn't realise that was an option - hadn't looked at the maglock interface in detail. That would be a neat feature - would I be right thinking the same CAt5 cable could do this, I'm not sure if he would be expecting to use all the pairs of wires or if some would be unused/available. Perhaps he expects to do this anyway and that's another reason for using this, would it be standard practice?
If the current requirement of the maglock is modest (such that voltage drop was not a major issue), then it might well not be necessary to use all the pairs of wires for it - so there might be some 'spare'.
Hopefully others will have familiarity with these things, and how they are usually used!
Kind Regards, John