Looking for advice? Is my DB25-1205 breakout board faulty?

PCW wrote: Another possible issue is the slowness of the DB25-1205 outputs. These are known to be marginal for step outputs. You might try increasing the step time.

Hi PCW,

I did try putting my meter on the 'dir' output of the board and it just sat at 5V (4.89VDC to be exact).

The Z axis changed from 0 -> 5 V depending on direction but the X didn't change when I manually tried to move it in the software.

That's what was leading me to settings or the board (or something else???). But I'll try adjusting the 'step time' just to see if it changes anything. Thanks for your continued help

John

Yeah if direction does not work that suggests a software setup (wrong pins in stepconf?)
hardware setup (breakout board options), wiring or hardware fault

PCW wrote: Yeah if direction does not work that suggests a software setup (wrong pins in stepconf?)
hardware setup (breakout board options), wiring or hardware fault

Is there a hardware setup for those breakout boards do you know? I don't remember setting it up?

I'll have a mess around with changing the step/dir outputs and see what happens.

Thanks for all your help

This card will work with LinuxCNC but it is slow...

I would have a good look at your stepper driver documentation. I have a feeling steppers need to be wired differently to how its done on an Arduino. I think they need to be set up as active low. Thats something I made a mental note of when I was working out how the card might work but I've never tried past testing that the outputs worked.

Hi Rodw,

The Arduino is just controlling the manual functions and that side of it works well. It's just the control from the PC via the breakout board that I'm struggling with.

But you're right about the active low. I seem to remember something about that when I was setting it up.

Thanks for your help.

In the brief play I had with the device, I patched some of the inputs and observed the pins in halshow to confirm it worked. I can't remember if I patched to GND or the +V rail. Too long ago.