This is the link to the datasheet / manual.
http://www.zappautomation.co.uk/prod...download?id=17
It is a very simple breakout board and the outputs are N, S, D and E.
the board buffers the signal from the parallel port so as long as you have a good 5V to power the board you will get good +5V signal from the S,D and E connections.
The only issue we have had with this board is when the USB is used to power the board, and never had any issue with it not having enough current to power the opto on the driver.