Fanuc and General Numeric 3 Series Controls Suggested Cable Pin Out CNC Control Computer 25 Pin Computer 9 Pin DB-25 Male DB-25 Male DB-9 Male 1 (Chassis ground) (Not connected) (Not connected) 2 3 2 3 2 3 7 7 5 4 and 5 looped 6 8 20 looped Notes on Suggested Machine Control Settings Nearly all 3 Series controls have a key lock or a switch that you need to turn on to..