# Implemented G Codes
## G Codes
* G0 -> G1
* G1 - Coordinated Movement X Y Z E
* G2 - CW ARC
* G3 - CCW ARC
* G4 - Dwell S[seconds] or P[milliseconds]
* G10 - retract filament according to settings of M207
* G11 - retract recover filament according to settings of M208
* G28 - Home all Axis
* G29 - Detailed Z-Probe, probes the bed at 3 points. You must be at the home position for this to work correctly.
* G30 - Single Z Probe, probes bed at current XY location.
* G31 - Dock Z Probe sled (if enabled)
* G32 - Undock Z Probe sled (if enabled)
* G90 - Use Absolute Coordinates
* G91 - Use Relative Coordinates
* G92 - Set current position to cordinates given
## M Codes
* M0 - Unconditional stop - Wait for user to press a button on the LCD (Only if ULTRA_LCD is enabled)
* M1 - Same as M0
* M17 - Enable/Power all stepper motors
* M18 - Disable all stepper motors; same as M84
* M20 - List SD card
* M21 - Init SD card
* M22 - Release SD card
* M23 - Select SD file (M23 filename.g)
* M24 - Start/resume SD print
* M25 - Pause SD print
* M26 - Set SD position in bytes (M26 S12345)
* M27 - Report SD print status
* M28 - Start SD write (M28 filename.g)
* M29 - Stop SD write
* M30 - Delete file from SD (M30 filename.g)
* M31 - Output time since last M109 or SD card start to serial
* M32 - Select file and start SD print (Can be used when printing from SD card)
* M42 - Change pin status via gcode Use M42 Px Sy to set pin x to value y, when omitting Px the onboard led will be used.
* M80 - Turn on Power Supply
* M81 - Turn off Power Supply
* M82 - Set E codes absolute (default)
* M83 - Set E codes relative while in Absolute Coordinates (G90) mode
* M84 - Disable steppers until next move, or use S[seconds] to specify an inactivity timeout, after which the steppers will be disabled. S0 to disable the timeout.
* M85 - Set inactivity shutdown timer with parameter S[seconds]. To disable set zero (default)
* M92 - Set axis_steps_per_unit - same syntax as G92
* M104 - Set extruder target temp
* M105 - Read current temp
* M106 - Fan on
* M107 - Fan off
* M109 - Sxxx Wait for extruder current temp to reach target temp. Waits only when heating
* Rxxx Wait for extruder current temp to reach target temp. Waits when heating and cooling
* M112 - Emergency stop
* M114 - Output current position to serial port
* M115 - Capabilities string
* M117 - display message
* M119 - Output Endstop status to serial port
* M126 - Solenoid Air Valve Open (BariCUDA support by jmil)
* M127 - Solenoid Air Valve Closed (BariCUDA vent to atmospheric pressure by jmil)
* M128 - EtoP Open (BariCUDA EtoP = electricity to air pressure transducer by jmil)
* M129 - EtoP Closed (BariCUDA EtoP = electricity to air pressure transducer by jmil)
* M140 - Set bed target temp
* M190 - Sxxx Wait for bed current temp to reach target temp. Waits only when heating
* Rxxx Wait for bed current temp to reach target temp. Waits when heating and cooling
* M200 - D[millimeters]- set filament diameter and set E axis units to cubic millimeters (use S0 to set back to millimeters).
* M201 - Set max acceleration in units/s^2 for print moves (M201 X1000 Y1000)
* M202 - Set max acceleration in units/s^2 for travel moves (M202 X1000 Y1000) Unused in Marlin!!
* M203 - Set maximum feedrate that your machine can sustain (M203 X200 Y200 Z300 E10000) in mm/sec
* M204 - Set default acceleration: P for Printing moves, R for Retract only (no X, Y, Z) moves and T for Travel (non printing) moves (ex. M204 P800 T3000 R9000) in mm/sec^2
* M205 - advanced settings: minimum travel speed S=while printing T=travel only, B=minimum segment time X= maximum xy jerk, Z=maximum Z jerk, E=maximum E jerk
* M206 - set additional homing offset
* M207 - set retract length S[positive mm] F[feedrate mm/min] Z[additional zlift/hop], stays in mm regardless of M200 setting
* M208 - set recover=unretract length S[positive mm surplus to the M207 S*] F[feedrate mm/min]
* M209 - S[1=true/0=false] enable automatic retract detect if the slicer did not support G10/11: every normal extrude-only move will be classified as retract depending on the direction.
* M218 - set hotend offset (in mm): T[extruder_number] X[offset_on_X] Y[offset_on_Y]
* M220 - S[factor in percent] - set speed factor override percentage
* M221 - S[factor in percent] - set extrude factor override percentage
* M240 - Trigger a camera to take a photograph
* M280 - Position an RC Servo P[index] S[angle/microseconds], ommit S to report back current angle
* M300 - Play beep sound S[frequency Hz] P[duration ms]
* M301 - Set PID parameters P I and D
* M302 - Allow cold extrudes
* M303 - PID relay autotune S[temperature] sets the target temperature. (default target temperature = 150C)
* M304 - Set bed PID parameters P I and D
* M350 - Set microstepping mode.
* M351 - Toggle MS1 MS2 pins directly.
* M400 - Finish all moves
* M401 - Lower z-probe if present
* M402 - Raise z-probe if present
* M404 - N[dia in mm] Enter the nominal filament width (3mm, 1.75mm) or will display nominal filament width without parameters
* M405 - Turn on Filament Sensor extrusion control. Optional D[delay in cm] to set delay in centimeters between sensor and extruder
* M406 - Turn off Filament Sensor extrusion control
* M407 - Displays measured filament diameter
* M500 - stores paramters in EEPROM
* M501 - reads parameters from EEPROM (if you need reset them after you changed them temporarily).
* M502 - reverts to the default "factory settings". You still need to store them in EEPROM afterwards if you want to.
* M503 - print the current settings (from memory not from EEPROM)
* M540 - Use S[0|1] to enable or disable the stop SD card print on endstop hit (requires ABORT_ON_ENDSTOP_HIT_FEATURE_ENABLED)
* M600 - Pause for filament change X[pos] Y[pos] Z[relative lift] E[initial retract] L[later retract distance for removal]
* M907 - Set digital trimpot motor current using axis codes.
* M908 - Control digital trimpot directly.
* M928 - Start SD logging (M928 filename.g) - ended by M29
* M999 - Restart after being stopped by error
# Comments
Comments start at a `;` (semicolon) and end with the end of the line:
N3 T0*57 ; This is a comment
N4 G92 E0*67
; So is this
N5 G28*22
(example taken from the [RepRap wiki ](http://reprap.org/wiki/Gcode#Comments ))
If you need to use a literal `;` somewhere (for example within `M117` ), you can escape semicolons with a `\`
(backslash):
M117 Hello \;)
`\` can also be used to escape `\` itself, if you need a literal `\` in front of a `;` :
M117 backslash: \\;and a comment
Please note that hosts should strip any comments before sending GCODE to the printer in order to save bandwidth.
