plasma stepper config

hello from spain.
im new to plsama cnc but i have built a three axis x y z all of which running fine withe the linuxcnc program, my problem is i cannot trigger the relay on my mach 3 5 axis bob from within the stepper configuration, i use pin 17 but what will trigger the relay ( cw, ccw, pwm, splinde on or what else could i try)

simply use spindel on for plasma start

dont forget the ADRESS of the parport

in terminal you shoudt do
on my pc its 0x2028
Standard is 0x378