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    CAN-FD cable

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    Duet Hardware and wiring
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    • dc42undefined
      dc42 administrators @deckingman
      last edited by

      @deckingman said in CAN-FD cable:

      When I started testing prototype expansion boards, @dc42's recommendation was to use high speed ADSL2 cables. Kenable do a nice range from about 200mm up to many metres

      Exactly so. A single twisted pair using the centre 2 pins is sufficient. Cables sold as "high speed ADSL" are good for this, they are normally two twisted pairs. One uses the centre 2 pins, the other uses the next 2 pins out.

      For UK users, Kenable sells them at prices starting from under £1.

      Duet WiFi hardware designer and firmware engineer
      Please do not ask me for Duet support via PM or email, use the forum
      http://www.escher3d.com, https://miscsolutions.wordpress.com

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      • gtj0undefined
        gtj0 @Danal
        last edited by

        @Danal said in CAN-FD cable:

        @gtj0 said in CAN-FD cable:

        Most flat telephone cables are crossover.

        Burned a couple of hours last night helping someone on the Jubilee discord because of this.

        The symptoms can be VERY misleading... because, with two boards, and therefore two crossed over cables, the second board will work as long as it is chained, and that same board will fail when attached alone. Sheesh.

        HAHAHAHAHA!
        Oh...sorry. 🙂

        1 Reply Last reply Reply Quote 1
        • ahwitmerundefined
          ahwitmer
          last edited by

          Thank you all for the explanations!

          CoreXYUV

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          • jens55undefined
            jens55
            last edited by

            I know it's an old thread but this cable is driving me nuts. I thought I had ordered the right cable but it turned out to be RJ45 😞 Anyway, I need a 1 meter long cable to go from the 6HC board to the tool distribution board. I am not too concerned about the cable from the tool distribution board to the tool but I wanted a commercial cable to go from the 6HC to the distribution board because it is running in close proximity to stepper power cables. Even running to the tool, I wonder if running in the same loom as the power cables to the tool board would cause interference.
            I have had too many mysterious issues with interference (not with CAN FD YET) to try and 'wing' it. I'd rather do it properly from the start.

            jens55undefined 1 Reply Last reply Reply Quote 0
            • jens55undefined
              jens55 @jens55
              last edited by jens55

              Anybody ever try using ethernet cable (as it is made of twisted pairs) and chop off the RJ45 connectors and replace them with RJ11 connectors?
              Maybe even break out the unused conductors and use them for feeding power ?

              Phaedruxundefined dc42undefined 2 Replies Last reply Reply Quote 0
              • Phaedruxundefined
                Phaedrux Moderator @jens55
                last edited by

                @jens55 I suppose RJ45 should work provided you've got the conductors lined up for CAN-FD.

                Not sure about running power through there as well. I thought you were trying to avoid interference. 😜

                Z-Bot CoreXY Build | Thingiverse Profile

                jens55undefined 1 Reply Last reply Reply Quote 0
                • jens55undefined
                  jens55 @Phaedrux
                  last edited by

                  Yes, I am trying to avoid interference but what happens if I run the CAN and power wires from the tool distribution board to the tool. They will be in the same loom so I am thinking that if they can run in the same loom then they should in theory be able to run in the same wire bundle which is just another word for a loom .....
                  I don't know .... I am asking for input because the last thing I want to do is to fight through sorting out intermittent (because they are never easy) weird issues down the road.

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                  • dc42undefined
                    dc42 administrators @jens55
                    last edited by dc42

                    @jens55 I suggest separate CAN and power wires. For power wires I use red/black twin cable, commonly sold as automotive or speaker cable. For CAN cables there are a few options:

                    • The high-speed ADSL cables that are readily available in the UK use twisted pairs and are terminated in RJ11 connectors. These are perfect for connecting MB6HC, EXP3HC and EXP1XD boards. There are also some US-based listings, e.g. https://www.ebay.com/itm/174276577330.
                    • For short runs to tool boards, telephone or alarm cable can be used. RJ11 connectors and associated crimp tools are available from eBay and Amazon at very low cost.
                    • For longer runs to tool boards I use one or two pairs separated from twisted pair ribbon cable such as this https://www.ebay.co.uk/itm/251792806204 and again a cheap RJ11 crimp tool.

                    Duet WiFi hardware designer and firmware engineer
                    Please do not ask me for Duet support via PM or email, use the forum
                    http://www.escher3d.com, https://miscsolutions.wordpress.com

                    jens55undefined 1 Reply Last reply Reply Quote 0
                    • jens55undefined
                      jens55 @dc42
                      last edited by

                      @dc42, thanks for that. The ADSL cables that are so readily available in the UK are harder to find then hen's teeth over here in North America. Amazon sometimes carries the brand you suggest but they are not currently available.
                      I have RJ11 connectors and tooling available so I was going to make something up but would have preferred a commercial cable.
                      I will take your advise and run the power cable separately - thanks.

                      dc42undefined 1 Reply Last reply Reply Quote 0
                      • dc42undefined
                        dc42 administrators @jens55
                        last edited by dc42

                        @jens55 see https://www.ebay.com/itm/174276577330. I don't know for certain that it has the correct pinout, but it seems likely (i.e. one twisted pair is connected straight through using the centre two pins).

                        Duet WiFi hardware designer and firmware engineer
                        Please do not ask me for Duet support via PM or email, use the forum
                        http://www.escher3d.com, https://miscsolutions.wordpress.com

                        jens55undefined 1 Reply Last reply Reply Quote 0
                        • jens55undefined
                          jens55 @dc42
                          last edited by

                          @dc42, thanks for the link! How do you know that this is a straight thru cable or that it is ADSL2 ?

                          jens55undefined 1 Reply Last reply Reply Quote 0
                          • jens55undefined
                            jens55 @jens55
                            last edited by

                            Never mind, saw your edit ... thanks !

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