This setting selects between inch and metric mode. When it is set to Inch, the programmed units for X, Y, and Z are inches, to 0.0001”. When it is set to Metric, programmed units are millimeters, to 0.001mm. All offset values are converted when this setting is changed from inches to metric, or vice versa. However, changing this setting will not automatically translate a program stored in memory; you must change the programmed axis values for the new units. When set to Inch, the default G code is G20, when set to Metric, the default G code is G21. [DIAGRAM]