Author Topic: 2740c microstepper  (Read 410 times)


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2740c microstepper
« on: May 02, 2021, 05:33:03 PM »
do you need to hook up the +5vdc to the micro stepper controller and if so where do you get the 5vdc off the pmdx424 or a separate pwer supply


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Re: 2740c microstepper
« Reply #1 on: May 18, 2021, 11:41:34 PM »
Where would you connect the +5V on the 2740c driver?  If you are looking for something to connect to the SP+/DIR+ pins, then you can use the "COM" pin on each PMDX-424 step/dir connector, and configure the PMDX-424 "step/dir common" to +5V.  Then connect the PMDX-424 step/dir pins to the SP-/DIR- pins (and configure the PMDX-424 step/dir as "active low".  Or as an alternative, you can connect the step/dir signals to the SP+/DIR+ and then connect the SP-/DIR- to the PMDX-424 "COM" terminal, and configure the PMDX-424 step/dir common for GND and step/dir polarity as active high.  There are articles on the PMDX FAQ site about this (

If that is not what you are asking about, can you give us a little more information?