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SmartBOB controllers and dedicated accessories / Updated PMDX-411 firmware, now constant Motion Underrun errors in Mach4

« on: July 29, 2021, 08:19:34 PM »

During my trying to troubleshoot my spindle sped PWM not working (which turned out to be user error in Mach4), I clicked the box in the PMDX plugin config to allow the PMDX-411 to update firmware. It reported that the new version was the exact same one as before, but I let it update anyway. The update went off without issue.

Now, whevenever I jog (key or arrow mode), it instantly hits a Motion Underrun error. I tried maxing the buffers out and it made no difference. I have been running this machine for over a year now and never saw this issue before so I don't think there's anything wrong with the PC. Literally the only thing I did was let this firmware update run. Any ideas?

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SmartBOB controllers and dedicated accessories / PMDX-411 Stopped outputting spindle PWM

« on: July 22, 2021, 07:21:21 PM »

Well, I emailed tech support here a couple days ago and no replies so trying the forum. I have a legit (not knockoff chinese etc) PMDX-411 purchased off this site that was happily working for over a year with my CNC router through Mach4. I hadn't used the machine for a couple of months and turned everything on and all was well but I could not get the spindle to turn on. I made the mistake of assuming it was my Gecko G540 and sent it back to them on RMA and they gave it the full look over and everything was fine.

So, after getting my Gecko back I probed pin 14 with my oscilloscope (as assigned by the PMDX config in Mach4) and I've got 0 volts. No matter if spindle is on or off or what speed I command the spindle, I get 0 volts on that pin. I can see the 12.5khz watchdog/charge pump signal and all the other functions work fine. Just no 50kHz spindle PWM.

Any idea what could cause this? Like I said, I made 0 changes...just booted up one day and it didn't work. Thanks for any help or advice!!