I have a quick question... what does the 12v socket at the top left corner of the A-164-1 Manual Gate module do? The instructions just say "Gate 1 is a bit different: provided that no plug is connected to the input socket it behaves like the other two manual gates (the socket is normalled to +12V via a protection resistor)." Does this just mean that it's a handy 12 volt source? If so, is it always on or is it supplied/interrupted by pressing the Gate 1 button?
Thanks