4.3.2 G codes for Status Change

G code	Format	Function
*G15	G15	Cartesian coordinate programming (cancel G16)
G16	G16	Program with polar coordinates
*G17	G17	Select the XY plane
G18	G18	Select the ZX plane
G19	G19	Select the YZ plane
^G20	G20	Inch unit input
^G21	G21	Metric unit input入
*G40	G40	Tool radius compensation canceled (Cancel G41/G42)
&G41	G41	Tool offset left offset compensation
&G42	G42	Tool offset right compensation
G43	G43	Tool length compensation
*G49	G49	Tool length compensation canceled (cancel G43)
*G50	G50	Mirror and scale up or down cancel (cancel G51)
&G51	G51 X_Y_Z_I_J_K_ or G51 X_Y_Z_P_	Mirror and scale up or down
*G54	G54	Select #1 working coordinate system
	G54.1 P001~P128	Select extra G54 coordinate offset
G55	G55	Select #2 Work Coordinate System
G56	G56	Select #3 Work Coordinate System
G57	G57	Select #4 Work Coordinate System
G58	G58	Select #5 Work Coordinate System
G59	G59	Select #6 Work Coordinate System
#G60	G60	Accurate in-position mode cancel (cancel G60)
#G61	G61	Accurate in position mode
G68	G68 X_Y_Z_R	Coordinate rotation
*G69	G69	Coordinate rotation cancel (cancel G68)
*G90	G90	Absolute programming
G91	G91	Incremental programming
G93	G93	Inverse time mode
*G94	G94	Feed rate in millimeters (inches) per minute
G95	G95	Feed rate in millimeters (inches) per revolution
G96	G96	Constant surface speed is on
*G97	G97	Constant surface speed control cancellation (cancel G96)
G98	G98	Can cycle instruction to return to the original starting height
*G99	G99	Can cycle command returns the reference height R point

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