# I am messing around with some power supplies. There are pinouts labelled "reserved" and "remote"- what are they?

I have worked out that that the Remote pin works like the Green "Power Supply On (active low)" wire on an ATX supply, and found a wiki on remote sensing about it being used to get diagnostics on the power-supply (if I understand correctly)

Now I have a little red wire that does nothing, with .5V on it. I am viewing pins 1 and 5 on This

Just curious, Is it perhaps simply a case of leaving a wire in because the standard connector/wire has X terminals and axials? It is called the "Reserved" pin, and other sites cite it as a second "Remote pin" even though it does not activate the power supply.

It is usual in power supplies that a "remote" connection is used to control the voltage more precisely but providing a low current feedback of the voltage at the load. This allows the power supply to sense the voltage drop across the cable ($I * R_{cable}$) and to correct for it. In your case it is not clear which supply (there are two voltages and one sense) it should be associated with.