http://www.hardwaresecrets.com/article/402
but i think is in always "OFF" condition and to turn it on you must attached to a motherboard . How can i work psu thinking that is attached to a motherboard to be always on?. I have found this instructions but i dont know if is correct
http://www.electronics-tutorials.ws/blog/convert-atx-psu-to-bench-supply.html
And those instructions are correct, connect green to black and the psu will work.
The black/red wire is for power, and utilizes the green screw terminals on the board.
The other wire is for serial communication, for which we're fine tuning the firmware at the moment.
Once you have multiple boards and the firmware is finished you will use that connector.
For now we're supplying USB cables for every board purchased.