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    External Driver wiring to Duet2 wifi Expansion board issues

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    Duet Hardware and wiring
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    • D2xhaleundefined
      D2xhale
      last edited by

      I currently have ST-M5045 connected to Nema 23's. Just testing Dir(-)/Dir(+) wires coming straight from the expansion board with the Duet is powered on I am getting a -4v reading. Should this value be in the negative? I am positive that i have my multi meter leads touching the respective +/-. On top of that, it was my understanding with the Duet just powered on there should be a reading of 0. What could be wired incorrectly?

      Thank you for your time!

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      • dc42undefined
        dc42 administrators
        last edited by dc42

        The signals are differential so as to turn off the opto isolators in your external drivers faster. So the differential voltage will change between about +4V and -4V.

        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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        • D2xhaleundefined
          D2xhale
          last edited by

          Thank you for the clarification! I read in a post earlier that the Dir +/- should have no reading when sitting idle is this true? Im getting 4v sitting idle and have currently no response to the stepper motors.

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          • dc42undefined
            dc42 administrators
            last edited by

            No, the voltage between each pair of outputs pins should always be either about +4V or about -4V.

            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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            • D2xhaleundefined
              D2xhale
              last edited by

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              • D2xhaleundefined
                D2xhale
                last edited by

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