I have the Duet3 running in stand alone mode. Info:

M115 from YAT:

Back to SBC Mode and info:

sudo journalctl -u duetcontrolserver -ef

gpioget gpiochip0 25

config.g

; Configuration file for Duet 3 (firmware version 3) 
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.3 on Fri May 21 2021 17:05:16 GMT-0500 (Central Daylight Time)

; General preferences
G90                                          ; send absolute coordinates...
M83                                          ; ...but relative extruder moves
M550 P"Monstrosity"                          ; set printer name
M669 K1                                      ; select CoreXY mode

; Drives
M569 P0.0 S0                                 ; physical drive 0.0 goes backwards
M569 P0.1 S0                                 ; physical drive 0.1 goes backwards
M569 P0.3 S0                                 ; physical drive 0.3 goes forwards
M569 P0.4 S0                                 ; physical drive 0.2 goes forwards
M569 P0.2 S1                                 ; physical drive 0.2 goes forwards
M584 X0.0 Y0.1 Z0.3:0.4 E0.2                     ; set drive mapping
M350 X16 Y16 Z16 E16 I1                      ; configure microstepping with interpolation
M92 X160.00 Y160.00 Z1600.00 E404.62            ; set steps per mm
M566 X900.00 Y900.00 Z60.00 E120.00          ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z600.00 E1200.00           ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z120.00 E250.00          ; set accelerations (mm/s^2)
M906 X800 Y800 Z800 E800 I30                 ; set motor currents (mA) and motor idle factor in per cent
M84 S30                                      ; Set idle timeout

;Dual Z
M671 X-140:140 Y15:15  ; leadscrews at left (connected to Z) and right (connected to E1) of X axis

; Axis Limits
M208 X-130 Y-155 Z0 S1                             ; set axis minima
M208 X130 Y155 Z400 S0                       ; set axis maxima

; Endstops
M574 X1 S1 P"io1.in"                         ; configure active-high endstop for low end on X via pin io0.in
M574 Y1 S1 P"io2.in"                         ; configure active-high endstop for low end on Y via pin io1.in
M574 Z0                                   ; configure Z-probe endstop for low end on Z

; Z-Probe
M950 S0 C"io7.out"                           ; create servo pin 0 for BLTouch
M558 P9 C"^io7.in" H5 F120 T6000             ; set Z probe type to bltouch and the dive height + speeds
m558 A10 R1 S0.006                           ; Additional Mesh requirements
;*********************************************************************************************************
G31 P500 X17.75 Y38.1 Z.995                ; set Z probe trigger value, offset and trigger height
;*********************************************************************************************************
M557 X-100:130 Y-100:155 P2                     ; define mesh grid

; Heaters
M308 S0 P"temp0" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin temp0
M950 H0 C"out0" T0                           ; create bed heater output on out0 and map it to sensor 0
;M307 H0 B0 S1.00                             ; disable bang-bang mode for the bed heater and set PWM limit
M307 H0 R0.884 C317.6 D3.43 S1.00 V24.2
M140 H0                                      ; map heated bed to heater 0
M143 H0 S120                                 ; set temperature limit for heater 0 to 120C
M308 S1 P"temp1" Y"thermistor" T100000 B4138 ; configure sensor 1 as thermistor on pin temp1
M950 H1 C"out1" T1                           ; create nozzle heater output on out1 and map it to sensor 1
M307 H1 R2.275 C244.1 D5.68 S1.00 V24.2      ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                 ; set temperature limit for heater 1 to 280C

; Fans
M950 F1 C"out4" Q500                         ; create fan 0 on pin out4 and set its frequency
M106 P1 C"HotHead" S0 H1 T45
;M106 P0 C"HotHead" S0 H-1                               ; set fan 0 value. Thermostatic control is turned off

M950 F0 C"out5" Q500                         ; create fan 1 on pin out5 and set its frequency
;M106 P1 C"Print Cooler" S1 H1 T35                            ; set fan 1 value. Thermostatic control is turned on
M106 P0 C"Print Cooler" S0 H-1


; Tools
M563 P0 D0 H1 F0                             ; define tool 0
G10 P0 X0 Y0 Z0                              ; set tool 0 axis offsets
G10 P0 R0 S0                                 ; set initial tool 0 active and standby temperatures to 0C

; Custom settings are not defined

; Miscellaneous
M575 P1 S1 B57600                            ; enable support for PanelDue

T0 ; Sets Tool0 as default

My Raspberry Pi 4 Model B no longer sees the Duet3 board via the 26 pin ribbon cable.

In a nutshell, I do not see 3.3v on pin 22 to signal the PI. I did all the troubleshooting via the below thread and had the same results at all steps. This includes the v3.2.2 firmware via m115 and the voltage measurement checks. I tried multiple 26 wire ribbon cables, 2 raspberry PI 4B and multiple new SD card images.

It worked fine through 3 Benchy prints and when I cycled the power before the 4th, I got the DCS is not started error.

Let me know what info you would like. I have the Duet3 connected via USB and YAT.

Thanks!

https://forum.duet3d.com/topic/21640/duet3-dcs-is-not-started

Just pointing out I have this same issue and the exact same results with all the testing as the above. I a nutshell, the Duet3 no longer outputs 3.3v to signal the PI on pin 22.

Board bought May 11th from Filastruder. Was getting ready to print my 4th Benchy on a new system. Had turned the system off (Duet3 powers PI). When I turned it back on, it no longer worked.

@Phaedrux

Perfect thanks! Not sure how I missed that change. I'm good now!

I have a LJ12A3-4-Z-BX NPN proximity sensor. Everything seems to work fine, but I cannot get the Z-Probe inverted.

Here is my Config Info:

; Endstops
M574 X1 S1 P"!xstop"                           ; configure active-high endstop for low end on X via pin !xstop
M574 Y1 S1 P"!ystop"                           ; configure active-high endstop for low end on Y via pin !ystop
M574 Z1 S2                                     ; configure Z-probe endstop for low end on Z

; Z-Probe
M558 P5 C"^zprobe.in" I1 H10 F120 T6000        ; set Z probe type to unmodulated and the dive height + speeds
G31 P500 X40.5 Y0 Z2.5                         ; set Z probe trigger value, offset and trigger height
M557 X15:215 Y15:195 S20                       ; define mesh grid

With Z axis is away from the bed, I get the following results:

m119
Endstops - X: at min stop, Y: at min stop, Z: at min stop, Z probe: at min stop
ok

m119 with a screwdriver triggering it.

m119
Endstops - X: at min stop, Y: at min stop, Z: not stopped, Z probe: not stopped
ok

I've tried all sorts of config changes and commands via YAT and can't get it to change the behavior. using the m558 command I never see it say it is inverted:

m558
Z Probe 0: type 5, input pin zprobe.in, output pin nil, dive height 10.0mm, probe speed 120mm/min, travel speed 6000mm/min, recovery time 0.00 sec, heaters normal, max taps 1, max diff 0.03
ok
m558 I1
Z Probe 0: type 5, input pin zprobe.in, output pin nil, dive height 10.0mm, probe speed 120mm/min, travel speed 6000mm/min, recovery time 0.00 sec, heaters normal, max taps 1, max diff 0.03
ok
M558 P5 C"^zprobe.in" I1 H10 F120 T6000   
ok
M558 
Z Probe 0: type 5, input pin zprobe.in, output pin nil, dive height 10.0mm, probe speed 120mm/min, travel speed 6000mm/min, recovery time 0.00 sec, heaters normal, max taps 1, max diff 0.03
ok
M558 P5 C"^zprobe.in" i1 H10 F120 T6000   
ok
M558 
Z Probe 0: type 5, input pin zprobe.in, output pin nil, dive height 10.0mm, probe speed 120mm/min, travel speed 6000mm/min, recovery time 0.00 sec, heaters normal, max taps 1, max diff 0.03
ok
M558 P5 C"^zprobe.in" I0 H10 F120 T6000   
ok
M558
Z Probe 0: type 5, input pin zprobe.in, output pin nil, dive height 10.0mm, probe speed 120mm/min, travel speed 6000mm/min, recovery time 0.00 sec, heaters normal, max taps 1, max diff 0.03

Notes:

Board: Duet 2 WiFi (2WiFi)
Firmware: RepRapFirmware for Duet 2 WiFi/Ethernet 3.1.1 (2020-05-19b2)
Duet WiFi Server Version: 1.23

Wired
Brown to PSU 24v+
Blue to PSU GND
Black to Z__probe_n

Command M558 Reference link:

https://duet3d.dozuki.com/Wiki/Gcode#Section_M558_in_RepRapFirmware_Num_3