Pigi,
Jumper a wire from Pad 1 to J. Monitoring LED7, you should be able to short alternately the RST(X8) and Estop (X7). This is the Emergency Stop Latch. The LED should hold the On or Off state as you alternately jumper between X7 and X8. If your ok there your ready to hook it up to your computer.
Consider downlaoding a parallel port monitor such as lpt.exe here:
http://neil.fraser.name/software/lpt/
Phil