Do you have the instruction manual? if so, towards the end there is a description of what the pinout is. I made my own cable, looking up the pinout of the hurco, and the pinout of a serial port which I looked up with a google search. There are a couple pins you have to short together on the hurco side. I believe there are eight wires which need to travel between the computer and the machine, because I used an ethernet cable for mine. If you don't have the manual, let me know and I'll throw something up here in the next day or two, as I'm out of town tomorrow... unless bloke beats me to it.