@phaedrux
Recieved my new Duex yesterday and work out just great now!
Now I'm off to get use of some 3-point-independent-z-motor-super-mega-heavy-duty-auto-bed-leveling 
Thanks for your help and thanks to Duet-team and reprappro.me for the quick handling of the warranty case!
@phaedrux
Thanks for the reply!
I’ve sent an email now.
@phaedrux
Yes it has.
So I didn’t bother looking for another cable to try with.
@fcwilt
Yes, nothing there.
0V
0.L ohm
Have measured at multiple locations (+/- on Duet, Duex and PSU)
@fcwilt
Ok, thanks a lot for your time and effort!
The board is mounted on brass extenders for PC motherboards, extra tall so there should be enough clearance.
Hmm maybe I can find another ribbon cable just for trying something…
I’ve never used the </> button, only knew about the ‘’’ 
; Configuration file for Duet WiFi (firmware version 3)
; executed by the firmware on start-up
;
; generated by RepRapFirmware Configuration Tool v3.2.1 on Tue Jan 12 2021 00:28:54 GMT+0100 (centraleuropeisk normaltid)
; General preferences
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"ME4080" ; set printer name
M669 K1 ; select CoreXY mode
; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes backwards
M569 P4 S0 ; physical drive 4 goes backwards
M569 P5 S1 ; physical drive 7 goes forwards
M569 P6 S1 ; physical drive 8 goes forwards
M569 P9 S1 ; physical drive 9 goes forwards
M584 X0 Y1 Z2:5:6 E3 ; set drive mapping
M350 Z16 I0 ; configure microstepping without interpolation
M350 X16 Y16 E16 I1 ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z400.00 E402.00 ; set steps per mm
M566 X900.00 Y900.00 Z90.00 E3000.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z720.00 E12000.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z400.00 E4000.00 ; set accelerations (mm/s^2)
M906 X1400 Y1400 Z1400 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
; Axis Limits
M208 X0 Y0 Z0 S1 ; set axis minima
M208 X270 Y270 Z260 S0 ; set axis maxima
; 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 ; Define Z to use Probe. Home to Min
; Z-Probe
M558 P9 C"^zprobe.in" H10 F120 T6000 X0 Y0 Z1 ; Set Z probe type/mode 9. H=Dive Height. F=Speed the bed moves
M557 X10:200 Y10:200 S50 ; define mesh grid
G31 X60 Y60 Z3.0 P25 ; Z probe trigger value, offset in relation to nozzle. And trigger height adjustment
M950 S13 C"duex.pwm5" ; Which pin BLTouch is connected to
; Heaters
M307 H7 A-1 C-1 D-1 ; Disable the 7th Heater to free up PWM channel 5 on the Duex board.
M308 S0 P"bedtemp" Y"thermistor" T100000 B4138 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0 ; create bed heater output on bedheat and map it to sensor 0
M307 H0 B0 R0.724 C166.5 D3.47 S1.00 V24.2 ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0 ; map heated bed to heater 0
M143 H0 S120 ; set temperature limit for heater 0 to 100C
M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.060000e-8 ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1 ; create nozzle heater output on e0heat and map it to sensor 1
M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit
M143 H1 S280 ; set temperature limit for heater 1 to 280C
; Fans
M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency
M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
M950 F1 C"fan1" Q500 ; create fan 1 on pin fan1 and set its frequency
M106 P1 S1 H1 T45 ; set fan 1 value. Thermostatic control is turned on
; 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
M501 ; load saved parameters from non-volatile memory
M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
T0 ; select first tool
Don't understand what you meen with </> tag?
@fcwilt
M98 P"config.g"
HTTP is enabled on port 80
FTP is disabled
TELNET is disabled
Error: Heater 7 not found
@fcwilt
Ok, tried that as well.
And there is no need to perform a reset?
Necessary positioning of jumper?
No nothing to get the drive outputs active more than assigning them in config?
Noticed that if I disconnect all stepper motors the end6 LED turns off.
If I connect a motor on any of the drive outputs the end6 LED turns on.
@fcwilt
24,2V if I remember correctly, same as at the Duet and PSU.
Edit
24,19V
@fcwilt
Yea the fuse is solid.
So there aren’t a configuration step to let the Duet know I added a Duex?
That was one answer I was hoping for… 
Tried with other drives on duex and remapped in config.g but the same LEDs behaves as before. Also swapped polarity on the motors.
It’s not that I completely missed some installation steps?
Because all I’ve done is connected the Duex with ribbon cable and VIN +/-.
I haven’t told the Duet there is a Duex in anyway if that’s necessary?
@phaedrux
This is a "new" Duex, ordered it 13 months ago and installed it this week.
@fcwilt
E.stop 6 lights up
E.stop 5 illuminates at half intensity
Edit
6 turns off with no motor connected but 5 illuminates with everything disconnected, except VIN of course.
@fcwilt
Not what I can find in console:
M122
=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.3 (2021-06-15 21:44:54) running on Duet Ethernet 1.02 or later
Board ID: 08DGM-917NK-F2MSW-6JTD4-3S46M-TG48D
Used output buffers: 1 of 24 (11 max)
=== RTOS ===
Static ram: 23876
Dynamic ram: 70740 of which 24 recycled
Never used RAM 19776, free system stack 190 words
Tasks: NETWORK(ready,24.9%,246) HEAT(delaying,0.0%,330) Move(notifyWait,0.1%,340) MAIN(running,74.0%,445) IDLE(ready,1.0%,29), total 100.0%
Owned mutexes:
=== Platform ===
Last reset 00:01:32 ago, cause: power up
Last software reset at 2022-03-05 00:05, reason: User, GCodes spinning, available RAM 19776, slot 0
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Step timer max interval 0
MCU temperature: min 27.4, current 33.2, max 33.4
Supply voltage: min 24.1, current 24.1, max 24.2, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Driver 0: position 0, standstill, SG min/max not available
Driver 1: position 0, standstill, SG min/max not available
Driver 2: position 0, standstill, SG min/max not available
Driver 3: position 0, standstill, SG min/max not available
Driver 4: position 0, standstill, SG min/max not available
Driver 5: position 0
Driver 6: position 0
Driver 7: position 0
Driver 8: position 0
Driver 9: position 0
Driver 10: position 0
Driver 11: position 0
Date/time: 2022-03-05 02:41:06
Cache data hit count 3379310039
Slowest loop: 5.73ms; fastest: 0.17ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 3.5ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 83, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed moves 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters = 0 -1 -1 -1, chamberHeaters = -1 -1 -1 -1
Heater 1 is on, I-accum = 0.0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty.
=== Network ===
Slowest loop: 5.81ms; fastest: 0.02ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8
Interface state active, link 100Mbps full duplexMaybe put some shrinktube on the plug or print a little arm that relives the stress from the movement on the cable near the plug.
So that the stress is applied on the cable a bit higher up and not directly by the plug-top.
(just realized I can't explain myself in english anymore)
Tried to connect my Z-stepper motors from Duet 2 Ethernet over to a Duex 5 (RRF 3.3).
The BL-touch works on the Duex as it should.
Only LED that is lit up is end stop nr.6.
When I use M115 it only says Duet 2 wifi/ethernet, nothing about Duex (it should?).
FIRMWARE_NAME: RepRapFirmware for Duet 2 WiFi/Ethernet FIRMWARE_VERSION: 3.3 ELECTRONICS: Duet Ethernet 1.02 or later FIRMWARE_DATE: 2021-06-15 21:45:03
Swapped the ribbon cable around, VIN-cable runs from Duet-board.
Here's my config.g
G90 ; send absolute coordinates...
M83 ; ...but relative extruder moves
M550 P"ME4080" ; set printer name
M669 K1 ; select CoreXY mode
; Drives
M569 P0 S1 ; physical drive 0 goes forwards
M569 P1 S1 ; physical drive 1 goes forwards
M569 P2 S1 ; physical drive 2 goes forwards
M569 P3 S0 ; physical drive 3 goes backwards
M569 P4 S0 ; physical drive 4 goes backwards
M569 P7 S1 ; physical drive 7 goes forwards
M569 P8 S1 ; physical drive 8 goes forwards
M569 P9 S1 ; physical drive 9 goes forwards
M584 X0 Y1 Z2:8:9 E3 ; set drive mapping
M350 Z16 I0 ; configure microstepping without interpolation
M350 X16 Y16 E16 I1 ; configure microstepping with interpolation
M92 X100.00 Y100.00 Z400.00 E402.00 ; set steps per mm
M566 X900.00 Y900.00 Z90.00 E3000.00 ; set maximum instantaneous speed changes (mm/min)
M203 X6000.00 Y6000.00 Z720.00 E12000.00 ; set maximum speeds (mm/min)
M201 X500.00 Y500.00 Z400.00 E4000.00 ; set accelerations (mm/s^2)
M906 X1400 Y1400 Z1400 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
M84 S30 ; Set idle timeout
Tried induvidual settings for Z-steps Z-speeds and Z-currents (Z400.00:400.00:400.00 and so on)
Tried with Z-motors on drive 7, 8, 9 on Duex but I recieved error about temps probably because of nothing was connected to drive 2?
So I swapped over to be using 2, 8, 9 (ZA, E5, E6).
Can I put jumpers on both ZA/ZB and use 7, 8, 9 (E4, E5, E6) without error?
Haha yes I did... I was probably to tired when reading because I can't remember the last paragraph about "Setting up the sys/resurrect-prologue.g file" 
Works like a charm now!