Schematics for pulse energy monitoring

First off, apologies if this is in the wrong place.  I couldn't work out how to comment on the article itself.

Is there a wiring diagram or schematic for this 12 input energy monitor - http://openenergymonitor.org/emon/buildingblocks/12-input-pulse-counting ?

I've seen a few versions of this sort of monitor online, but none of them have a wiring diagram and it would be handy.

Thanks,

z