Hi,
the Roadrunner program is in inches. A g20 code should allow the program to run on a metric machine though. You should try some other tests before worrying about the Roadrunner.
Jog the machine to roughly the center of the table and zero X, Y, and Z.
MDI:
G0 X100
X0
X100
X0
That should cause the X axis to move back and forth 100mm. Does it do it?
Do the same thing with the Y axis:
G0 Y100
Y0
Y100
Y0
Now you need to make sure the Z axis works:
G0 Z50
Z0
Z50
Z0
Let us know how you get on.
Craig