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    CAN-FD hardware

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    • JoergS5undefined
      JoergS5 @dc42
      last edited by

      @dc42 Thank you. I hope the MCP25 family is compatible with each other. If not, I will let you know...

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      • JoergS5undefined
        JoergS5 @Kulitorum
        last edited by JoergS5

        @Kulitorum According to the table in https://www.computer-solutions.co.uk/info/Embedded_tutorials/can_tutorial.htm it is 10 m (ISO 11898-2 2015). Small house 😉

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        • dc42undefined
          dc42 administrators
          last edited by dc42

          Max cable length depends on the data rate and the number of devices on the bus. We use 1Mbits/sec as the base data rate. Page 5 of http://www.ti.com/lit/an/slla270/slla270.pdf suggests 1Mbits/sec should be OK to 40m length. The fast data rate will be configurable, https://duet3d.dozuki.com/Wiki/Gcode#Section_M952_Set_CAN_FD_bus_data_rate.

          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

          T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
          • T3P3Tonyundefined
            T3P3Tony administrators @dc42
            last edited by

            @Kulitorum 40m.. slighly larger house 😄

            www.duet3d.com

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            • Kulitorumundefined
              Kulitorum
              last edited by

              I was hoping for 150m 🙂

              Will everything work at 0.25Mbps?

              Kulitorum

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              • dc42undefined
                dc42 administrators
                last edited by

                Currently it would need a new firmware build to change the base data rate, because everything (including the bootloaders on the expansion boards) needs to know what that data rate is. Using lower speeds might work if the machine isn't tool complex and doesn't print sequences of tiny segments fast, so that we don't need to send movement commands to expansion boards at too great a rate.

                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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                • Kulitorumundefined
                  Kulitorum
                  last edited by

                  hehe, shame.

                  I print 1000mm/sec with vertices for every 5mm...

                  So can I amplify the signal every 40 meters? - Do expansion boards daisy chain?

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                  • JoergS5undefined
                    JoergS5
                    last edited by JoergS5

                    I saw there exist CAN-FD repeaters, maybe an option.

                    It exists a CAN FD repeater reference design by http://www.ti.com/lit/ug/tidudb5a/tidudb5a.pdf (for an optional extension card maybe).

                    Kulitorumundefined 1 Reply Last reply Reply Quote 0
                    • T3P3Tonyundefined
                      T3P3Tony administrators @Kulitorum
                      last edited by

                      @Kulitorum said in CAN-FD hardware:

                      Do expansion boards daisy chain?

                      yes, but only physically, they don't amplify/act as an active repeater.

                      www.duet3d.com

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                      • Kulitorumundefined
                        Kulitorum @JoergS5
                        last edited by

                        @JoergS5 Thanks, looks good.

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                        • Kulitorumundefined
                          Kulitorum
                          last edited by

                          Once I receive the expansion boards, I will experiment with this. Any ETA?

                          T3P3Tonyundefined 1 Reply Last reply Reply Quote 0
                          • T3P3Tonyundefined
                            T3P3Tony administrators @Kulitorum
                            last edited by

                            @Kulitorum will be emailing those who expressed an interest in the prototype boards after TCT show next week (you are on the list!)

                            www.duet3d.com

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