Measuring the ports on the PC gives this result.
This is directly at the PC no cables in between.
pin2 4,79v
pin3 4,79v
pin4 4,79v
pin5 4,79v
pin6 3,1v
pin7 -0,249v
pin 2 is step for X
pin 3 is dir for X
pin 4 is step for Y
pin 5 is dir for Y
pin 6 is step for Z
pin 7 is dir for Z