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Thanks filling in my knowledge gap for what Nema is (and yes then it's Nema17).
This small thing is more for me to understand the build and functions in general, not so much as in really doing stuff (maybe some engraving and PCB, which is more engraving than milling, I guess).
That includes to have a setup similar to what I aim for for the bigger router. That's why I tend to spend a bit more money and do a bit of "overkill" for the little toy machine, but can test the basic working for the relevant things.
So I'd still like some more concrete hints for what might be the right stuff to buy controller wise.
The 7192 seems to be the least costly ethernet connected mesa board. Do I use that an kook up 3 of the TB6600 boards to the parport and start experimenting?
(and a power supply obviously)

Should be in the format

Further, a more lovingly taken picture of the lspci command would also help...

Just to make that sure - you can only measure a sine wave when you move the linear encoder homogeneously (approximately).

You can also measure the signal between A+ and A- with a multimeter - just move the linear encoder slowly.
Another possibility to "see something" is to measure a single signal and therefore switch the scope channel to AC coupling and choose 100mv/DIV or less.




 

That should be here forum.linuxcnc.org/ethercat/45336-etherc...step-by-step?start=0
You don't need to compile anything, it is ready to use.

Hi all,

I’m trying to troubleshoot a Heidenhain LS403 linear encoder (1Vpp analog output) that’s connected via a Heidenhain 1Vpp-to-TTL converter to a Mesa card in my LinuxCNC setup.

We weren’t seeing any motion or position data in HAL, so I decided to check whether the encoder is still producing valid analog signals.

I’m fairly new to working with encoders — and also still learning my way around the oscilloscope — so I might be missing something obvious. That said, here’s what I’ve done so far:

• The encoder is powered via the Mesa card: 5 V and 0 V are confirmed and stable.
• For testing, the signal wires are disconnected from the Mesa. I’m only using it to supply power.
• Based on voltage levels and scope behavior while moving the encoder, I’ve identified A+, A–, B+, B–, R+, R–.
• When I probe A+ or B+ relative to 0 V, I see a flat ~2.0 V line. A– and B– show ~1.5 V. Moving the encoder slightly only causes minor fuzz — no visible sine wave.
• When I move the encoder head, the line does become “noisier” — in the sense that it gets visibly fuzzy — but I never see a clean sine wave.
• I also tried using two probes and a CH1 - CH2 math channel on a Siglent SDS1104X-E to simulate differential probing, but still no sine wave appears.
• I’ve played with timebase, voltage scale, trigger settings, etc., without much change.
  
  At this point I’m unsure whether:
  • The encoder might be dead,
  • The signal needs a specific load to show up properly,
  • Or I’m simply not probing it correctly.
    
    Any tips or guidance would be very welcome — especially from folks who’ve scoped Heidenhain 1Vpp encoders before. Thanks in advance!