External Driver wiring to Duet2 wifi Expansion board issues



  • 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!


  • administrators

    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.



  • 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.


  • administrators

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



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