Letter Addresses (or G-Code Fields)
| Field | Functionality |
| Gnnn | Standard G Code command |
| Mnnn | Miscellaneous commands' field |
| Tnnn | Define tool (in this case it is only one) |
| Xnnn | X coordinate field |
| Ynnn | Y coordinate field |
| Znnn | Z coordinate field |
| Fnnn | Feedrate (speed in deg/sec) |
| Pnnn | Time (in msec) |
| Rnnn | Radius (not used at the moment) |
| Nnnn | Command queue number |
G-Codes
| Command | Name | Description | Parameters | Used | Example |
| G0 | Rapid Positioning | Move Rapidly to point M(x,y,z) | X,Y,Z,F | Yes | G0 X23 Y34 F200 |
| G1 | Linear Interpolation | Controlled move in a straight line to point M(x,y,z) | X,Y,Z,F | Yes | G1 X32 F50 |
| G2 | Circular Interpolation | Controlled circular move towards an arc CW | X,Y,Z,R,F | Yes | G2 X20 R2 |
| G3 | Same as above but CCW | | | Yes | G3 X20 R2 |
| G4 | Dwell | Do nothing for a defined time (in msec) | P | Yes | G4 P300 |
| G17 | XY Plane | | | No | G17 |
| G18 | XZ Plane | | | No | G18 |
| G19 | YZ Plane | | | No | G19 |
| G20 | Coordinates to in | All units are now in Inches (UK Metric System) | | No | G20 |
| G21 | Coordinates to mm | All units are now in Millimeters 10^(-3) m (S.I.) | | No | G21 |
| G28 | Move to origin | Move to zero endstops You can define which axis would be zeroed | X,Y,Z | Yes | G28 X0 Z25.4 |
| G90 | Absolute Positioning System | Programming from now on will be employed in Absolute Positioning System (APS) | | Yes | G90 |
| G91 | Relative Positioning System | Programming from now on will be employed in Relative Positioning System (RPS) | | Yes | G91 |
Codes with command numbers less than 10 can be written by adding a 0 (zero) in front of them. e.g. G1 is the same as G01
Positioning and Measurements
Absolute Positioning System (APS)
In APS the set of all points is described relative to the starting point (a.k.a. the "home point" W). An example will be more comprehensive:
| Point | X | Y | Z |
| W | 0 | 0 | 0 |
| A | 24 | 10.5 | 30 |
| B | 30 | 15 | 32 |
Relative Positioning System (RPS)
In RPS all coordinates are relative to the last position.
You must define the Unit System you're working with (Inches or Millimeters)
Units (Inches)
The usage of Inches (in) as a unit for length is at the momment being used only in UK.
1in is equal
| SI units |
| 0.0254 m | 25.4 mm |
| US customary/Imperial units |
| 1⁄36 yd | 1⁄12 ft |
Units (Millimeters)
The usage of Millimeters (mm) as a unit for length is used worldwide as a submultiple of 1m (S.I.) and it is equal to 1/1000 m
M-Codes
| Command | Name | Description | Parameters | Used | Example |
| M0 | Stop | Scheduled machine pause | | Yes | M0 |
| M1 | Sleep | Optional machine sleep | | Yes | M1 |
| M2 | Finish | End of program | | Yes | M2 |
| M6 | Tool Change | Only one tool is available | | No | |
| M30 | Loop Program | Ends the current program and returns to its beginning | | Yes | |
T-Codes
| Command | Name | Description | Parameters | Used | Example |
| T1 | Tool #1 | The only tool being used for the time being | | No | T1 |
Examples
Table of Points
| Point | X | Y | Z |
| W | 0 | 0 | 0 |
| 1 | 10 | -10 | 2 |
| 2 | 9 | 12 | 4 |
Code
T1
G0 X10 Y-10 Z2 F200
G1 X9 Y12 Z4 F150
M3