Connecting an expansion board - duet 3



  • I have a phone cable with a 6 pin connector at each end and only the 2 middle wires connected. Can I use this to connect the expansion board?

    If not, are the connectors RJ12?



  • Looks like the cables swap between pins 3 and 4 so no good.

    Can someone confirm the correct connector?



  • https://duet3d.dozuki.com/Wiki/Getting_Started_With_Duet_3

    RJ11 twisted pair cables to connect the expansion board(s). When connecting a version 0.5 Duet 3 main board to an expansion board, the wires must be crossed. When connecting a version 0.6 or later Duet 3 main board to an expansion board, or connecting two expansion boards together, the cable wiring must be straight-through.



  • I have successfully used off the shelf RJ11 cables. They just need all pins, and the ancient telco swap of the center pins (which nearly all pre-made cables have). Best is cables made with twisted pair (not just parallel wires).

    Specifically, this one works: https://www.amazon.com/gp/product/B011SS7LYU It is a High Speed ADSL twisted pair cable.



  • Ta. Amazon order it is



  • It's a bit late now but for anyone stumbling across this thread in the future, what to look for is High Speed ADSL 2 cables. This was @dc42s recommendation to me. Kenable do nice range of flexible ones which are good for situations where boards might be mounted on moving gantries.


  • administrators

    @jay_s_uk said in Connecting an expansion board - duet 3:

    I have a phone cable with a 6 pin connector at each end and only the 2 middle wires connected. Can I use this to connect the expansion board?

    Yes. It should really be twisted pair, which you can find sold as "ADSL high speed" or "ADSL high quality" cables. However, if the cable length is short, you can get away with non-twisted pair cables. The wiring is straight-through unless you have a Duet 3 v0.5 prototype board.

    A good source of twisted pair RJ11 cables in the UK is https://www.kenable.co.uk/en/search?controller=search&search_query=adsl+high+speed.



  • @dc42 said in Connecting an expansion board - duet 3:

    ADSL high speed

    I have a 6 pin cable I bought https://www.jaycar.com.au/1m-rj12-6p-6c-extension-cable/p/YT6033, and connected my expansion board. However I get errors.

    M569 Response timeout CANN addr 1 req type 6018 RID=0
    M350 Response timeout CANN addr 1 req type 6021 RID=1
    M906 Response timeout CANN addr 1 req type 6017 RID=2

    Any suggestions dc42?



  • @mattbaker said in Connecting an expansion board - duet 3:

    I have a 6 pin cable I bought https://www.jaycar.com.au/1m-rj12-6p-6c-extension-cable/p/YT6033, and connected my expansion board. However I get errors.

    look closely at the ends, are the colours in the same order? Telephone cables like to swap things up.



  • @bearer Looks like they are.



  • @mattbaker said in Connecting an expansion board - duet 3:

    @bearer Looks like they are.

    thats a bit ambiguous; they are the same or crossed over?



  • @bearer Not crossed



  • This is my config.g file

    ; Configuration file for Duet 3 (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Thu Jan 23 2020 12:19:31 GMT+1100 (AEDT)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"Duet 3" ; set printer name

    M667 S1 ; select CoreXY mode

    ; Drives
    M569 P0.0 S0 ; physical drive 0.0 goes forwards
    M569 P0.1 S0 ; physical drive 0.1 goes forwards
    M569 P0.2 S1 ; physical drive 0.2 goes backwards
    M569 P0.3 S1
    M569 P0.4 S1
    M569 P0.5 S0 ; physical drive 0.5 goes forwards
    M569 P1.0 S0 ; physical drive 1.0 goes forwards

    M584 X0.0 Y0.1 Z0.2:0.3:0.4 E0.5:1.0 ; set drive mapping
    M350 X16 Y16 Z16 E16:16 I1 ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z400.00 E3000.00:3000.00 ; set steps per mm
    M566 X900.00 Y900.00 Z12.00 E120.00:120.00 ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00 E1200.00:1200.00 ; set maximum speeds (mm/min)
    M201 X500.00 Y500.00 Z20.00 E250.00:250.00 ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1500 E500:500 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    M671 X480.00:230.00:-10.00 Y440.00:-30.00:440 S100

    ; Axis Limits
    M208 X0 Y0 Z0 S1 ; set axis minima
    M208 X450 Y450 Z550 S0 ; set axis maxima

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

    ; Z-Probe
    M574 Z1 S2
    M558 P5 C"io2.in" I1 H10 F200 T6000 ; set Z probe type to switch and the dive height + speeds
    G31 P500 X40 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
    M557 X40:440 Y40:440 S80 ; 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
    M143 H0 S120 ; set temperature limit for heater 0 to 120C
    M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0 ; map heated bed to heater 0
    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
    M143 H1 S280 ; set temperature limit for heater 1 to 280C
    M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit

    ; Fans
    M950 F0 C"out3" Q500 ; create fan 0 on pin out3 and set its frequency
    M106 P0 S0 H-1 ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"out4" Q500 ; create fan 1 on pin out4 and set its frequency
    M106 P1 S1 H-1 ; set fan 1 value. Thermostatic control is turned off

    ; Tools
    M563 P0 D0 H1 F-1 ; 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


  • administrators

    Is the LED on the expansion board flashing in sync with the one on the main board? If so then the cable is ok.

    Have you set the address switches on the expansion board to address 1?



  • @dc42 I tried changing the switches , but no joy. I'll have to check the lights in the morning. Which ones should I be looking at? Colour etc?



  • @mattbaker If set to 0, would the drive number be P0.6 etc?


  • administrators

    @mattbaker said in Connecting an expansion board - duet 3:

    @mattbaker If set to 0, would the drive number be P0.6 etc?

    The expansion board cannot be set to 0 in use (only to trigger a firmware update) in the configuration "0.n" refers to the mainboard.



  • @mattbaker said in Connecting an expansion board - duet 3:

    @dc42 I tried changing the switches , but no joy. I'll have to check the lights in the morning. Which ones should I be looking at? Colour etc?

    There is red LED on the main that flashes at about 1Hz. There is also a red LED on the expansion board which should also flash in synchronisation with the LED on the main board.


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