Right I have found the steps per inch at last ( it is 9600 ) Just need to find out the Pulses per Unit to enter in to the DSP.
And have also figured out that reset z homes it to the bottom and stays there so now I have to add a permanent switch for Z-
Auto focus seems to raise the table until it hits the trigger Z+ (switch or sensor) then backs off.
I presume this is the focal multiple thing shown in the bottom left
Once I have the Z-axis set correctly I shall play some more and figure the auto focus out
Ps I got Deus EX for my birthday today so I probably won't get much work done this weekend