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  • PCW
31 May 2026 04:44
Replied by PCW on topic Differential encoder hard crashes the PC MESA7i77
If you are not overloading the 5V supply on the 6I25
I really don't see how any wiring or data issues can
crash the host PC.

That is, this really has nothing to do with differential
encoders at all.

I'm beginning to wonder if this is not a parity error or similar
either in the host PC or PCIE interface

Did you say the you only got the error when you changed the MPG position?
  • tommylight
31 May 2026 02:34
Replied by tommylight on topic Differential encoder hard crashes the PC MESA7i77
Another thing to try:
-set the Mesa encoder inputs to "single ended" for that channel (see manual)
-Wire only +5V and GND-
-wire only A+ and B+ from MPG to Mesa A+ and B+
-test
-wire only A- and B- to Mesa A- and B-
-test
?
  • tommylight
31 May 2026 02:08
Replied by tommylight on topic Differential encoder hard crashes the PC MESA7i77
Do you have any normal encoder, or a servo motor with encoder attached to it?
If yes, wire it and test, see if the same thing happens.
Do you have the spec for the MPG?
  • RMJ fabrication
31 May 2026 01:50
Replied by RMJ fabrication on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
So this is the current setup 
And I have this HP PC here I can use for testing. 
  • grossm5000
31 May 2026 01:30 - 31 May 2026 01:32
Replied by grossm5000 on topic Differential encoder hard crashes the PC MESA7i77
I had a few more minutes to work on it this week - I wired the encoder via a short pigtail to the 7i77, got the same results as before. So the issue cannot be a faulty wiring connection.
I also found that my 5vdc power supply may not have been grounded, so I fixed that, no change, the PC still crashes.
I also tried all the other encoder locations on the 7i77, all producing the same issue.

I will keep updating as I do more.
  • snowgoer540
31 May 2026 00:29
Replied by snowgoer540 on topic HalView
Nice work, excited to test it out!

I am reminded of Excessive Overkill's youtube channel (around 18:39):  


 
  • PCW
31 May 2026 00:27
Replied by PCW on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
Yes, this does not seem to be a latency issue but a connection issue.
Not really sure what the cause is. I have a 800 G1 here running
LinuxCNC without any Ethernet connection issues so I don't know.

Is is possible to try another PC to try and isolate the issue?



 
  • tommylight
30 May 2026 23:50
Replied by tommylight on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
Rod, no amount of tuning is gona help on a disconnected link.
-
Did you change the cable?
Do you have a USB-to-LAN adapter to test with?
Do you have another PC to test with, any PC with a different cable.
-
Code:
ip -s link show eno1
But, only after the Mesa is connected and trying to run LinuxCNC.
  • rodw
30 May 2026 23:40
Replied by rodw on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
There are a lot more tuning settings required but lets get the main one
Can you type: echo $(nproc)
and then back in grub customizer add isolcpus=X where X = $(nproc)-1 from what is printed from the line above.
Then reboot.
  • RMJ fabrication
30 May 2026 22:43
Replied by RMJ fabrication on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
My bad the PC is actually a HP Elitedesk 800 G1 USDT 
AMT is not disabled in BIOS where can I find those settings?   
  • PCW
30 May 2026 21:57
Replied by PCW on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
OK a 8300 USDT uses Intel hardware and should be fine

Is AMT disabled in the BIOS?
  • RMJ fabrication
30 May 2026 21:50
Replied by RMJ fabrication on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
So some background information my plasma table electronics and mesa 7i76e are not new the PC is new a newer HP elite 8300 USDT I swapped it out recently following issues with this post  forum.linuxcnc.org/plasmac/53087-qtplasm...e-0-in-middle-of-cut  
  • RMJ fabrication
30 May 2026 21:22
Replied by RMJ fabrication on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
I am not sure how do I find host hardware? 
  • PCW
30 May 2026 20:37
Replied by PCW on topic Ethernet connection to Mesa 7i76e disconnecting on its own after one minute
is the

ip a

result still reasonable?

What is the host hardware?
  • Surmetall
30 May 2026 19:31
Replied by Surmetall on topic Retrofitting an old industrial CNC mill with EtherCAT components - MAHO MH400E
how cool is that! great work! that opens a huge door for older Heidenhain scales to ethercat without the need of exe's. thank you very much!
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