Here is my config I have matched to a few on this forum and I think I got it right.
; CoreXY sample config file for dc42 Duet firmware
M111 S0 ; Debug off
M550 PBig-D ; Machine name (can be anything you like)
M551 Preprap ; Machine password (used for FTP connections)
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;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED ; MAC Address
;*** Wifi Networking
M552 S1 ; Enable WiFi
M555 P2 ; Set output to look like Marlin
;M575 P1 B57600 S1 ; Comms parameters for PanelDue
; Machine configuration
M569 P0 S0 ; Drive 0 goes forwards (change to S0 to reverse it)
M569 P1 S1 ; Drive 1 goes forwards
M569 P2 S0 ; Drive 2 goes forwards
M569 P3 S1 ; Drive 3 goes forwards
M569 P4 S1 ; Drive 4 goes forwards
; If you use an endstop switch for Z homing, change Z0 to Z1 in the following line, and see also M558 command later in this file
M574 X1 Y2 Z1 S0 ; set endstop configuration (X and Y and endstops only, at low end, active high)
M667 S1 ; set CoreXY mode
M350 X64 Y64 Z64 E64 I0 ; Set 16x microstepping with interpolation
M92 X400 Y400 Z1600 ; Set axis steps/mm
M92 E1643:1643 ; Set extruder steps/mm
M584 E4
M906 X800 Y800 Z800 E1400 ; Set motor currents (mA)
M201 X1000 Y1000 Z300 E4000 ; Accelerations (mm/s^2)
M203 X15000 Y15000 Z500 E1500 ; Maximum speeds (mm/min)
M566 X800 Y800 Z24 E1200 ; Maximum jerk speeds mm/minute
M208 X290 Y285 Z320 ; set axis maxima (adjust to suit your machine)
M208 X-10 Y0 S1 ; set axis minima (adjust to make X=0 and Y=0 the edges of the bed)
G21 ; Work in millimetres
G90 ; Send absolute coordinates…
M83 ; ...but relative extruder moves
; Z probe
M558 P1 X0 Y0 Z0 ; Analog Z probe, also used for homing the Z axis
;G31 Z2.47 P500 S1 ; Set the probe height and threshold (put your own values here)
; The following M557 commands are not needed if you are using a bed.g file to perform bed compensation
;*** Adjust the XY coordinates in the following M557 commands to suit your build and the position of the Z probe
;M557 P0 X30 Y25 ; Four...
;M557 P1 X30 Y155 ; ...probe points...
;M557 P2 X250 Y125 ; ...for bed...
;M557 P3 X250 Y25 ; ...levelling
;M557 P4 X150 Y95 ; 5th probe point for levelling
; Thermistors and heaters
;*** You can use S and B parameters to define the parameters of the thermistors you are using
M305 P0 T100000 B4388 R4700 H0 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
M305 P1 T100000 B4388 R4700 H0 L0 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
M305 P2 T100000 B3974 R4700 H0 L0 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction
M301 H1 P10 I0.10 D100 T0.50 S1.0 ; PID settings for extruder 0
M301 H2 P10 I0.10 D100 T0.50 S1.0 ; PID settings for extruder 1
M570 S120 ; Increase to allow extra heating time if needed
M307 H0 A86.7 C612.7 D6.0 B0
M307 H1 A406.3 C166.4 D10.3 B0
; Fans
M106 P0 T50 H1
M106 P1 T50 H1
M106 P2 T50 H1
; Tool definition
M563 P0 D0 H1 ; Define tool 0
G10 P0 S0 R0 ; Set tool 0 operating and standby temperatures
;*** If you have a dual-nozzle build, un-comment the following 3 lines
;M563 P1 D1 H2 ; Define tool 1
;G10 P1 S0 R0 ; Set tool 1 operating and standby temperatures
;*** If you are using axis compensation, put the figures in the following command
M556 S78 X0 Y0 Z0 ; Axis compensation here
T0 ; select first hot end
