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  • BoMadsen
22 Nov 2025 15:57
7i76eu steppers don't move was created by BoMadsen
Hi,

I have a DMC2 Mini that I am trying to convert from the Chinese Mach3 board that it came with, to a 7i76eu controlled by linuxcnc.

But I am stuck at getting the stepper motors to move. The DMC2 comes with three Nema23 57-76 motors with built-in controllers, similar to this one:
www.aliexpress.com/item/1005006172891348.html
I have wired the motors like this:
EN-  -> TB2 pin 1 GND
EN+ -> TB2 pin 6 +5VP
DR-  -> TB2 pin 4 DIR1-
DR+ -> TB2 pin 5 DIR1+
PU-  -> TB2 pin 2 STEP0-
PU+ -> TB2 pin 3 STEP0+
But nothing happens when I try to jog the axis. The DRO in the UI change, but the steppers are totally silent. After a while jogging around, I usually get a "Join 0 following error".
I can measure +5v on EN, so I believe that the axis is enabled.

I have just installed LinuxCNC from the livecd, and the configuration is made with pncconf.

Any ideas on what could be wrong, or what I can do to debug it? I don't have an oscilloscope, so I have a hard time actually confirming that the MESA card sends out pulses.

Thank you in advance!
  • PCW
22 Nov 2025 15:46
Replied by PCW on topic Chinese Mesa 7I92 from aliexpress NEW
The basic issue is that the current firmware is just GPIO (no Step/Dir hardware etc)

There could be a couple reasons for this:

1. The wrong firmware is installed,

2. The card had corrupted firmware so has loaded the fallback firmware (which is just GPIO)

Did the card vendor supply a firmware file?, it does not look like any standard 7I92 firmware to me

If they did supply firmware, I would try re-writing it with:

mesaflash --device 7i92 --addr 10.10.10.10 --write  vendor_supplied_firmware_file_name.bit --reload

 
  • tommylight
22 Nov 2025 14:21
Replied by tommylight on topic StepperOnline A6 Servo
Where should we move the above reply to?
  • bszoke
22 Nov 2025 13:43
Replied by bszoke on topic StepperOnline A6 Servo
I made some comments on this in another thread about the PDO configuration, you are correct, internally it does configure the PDO's and sets the PDO assignment register ONLY if you set configPdos="true".

forum.linuxcnc.org/ethercat/56205-help-w...ives?start=20#338949
  • aDm1N
22 Nov 2025 13:38 - 22 Nov 2025 20:55
Replied by aDm1N on topic EtherCAT + CiA402 Servo: OP state reached, but axis won’t move (only Following E
Very short explanation of how PV ↔ CSP switching works:

Only one CiA-402 mode is active at any time.

In spindle mode (PV):
- The drive receives only target-velocity.
- HAL forces: pos-cmd = pos-fb (follow-mode).
- So the axis has no position error while the spindle is turning.

When switching to C-axis mode (CSP):
- HAL switches pos-cmd from “follow-mode” to the motion planner.
- Since pos-cmd == pos-fb at the moment of switching, there is no position jump and no torque spike.

Why this is valid:
- PV mode ignores position commands.
- CSP mode ignores velocity commands.
- Therefore the drive never receives conflicting commands.
- This fully complies with CiA-402 behavior.

Status:
This configuration has been tested electrically only.  
The motors run and switch modes as expected, but the mechanical connection to the machine is not installed yet.
 
  • Aciera
22 Nov 2025 12:50
Replied by Aciera on topic linuxcnc_2.9.4-amd64.hybrid.iso cheksum?

At this juncture you all disgust me.


Like so many times before when you noisily left this forum just to reappear a few days later under a different login.
  • unknown
22 Nov 2025 12:45
Replied by unknown on topic PoKeys57CNC HAL component
Thank you for giving back to the community, it's refreshing to see rather than those that just take take take.
A Tip O The Hat to you sir
  • unknown
22 Nov 2025 12:43
Replied by unknown on topic linuxcnc_2.9.4-amd64.hybrid.iso cheksum?
I still stand by my removed comment.
And I'm very sorry to say but you admins are weak and spineless to allow this buffoon to carry on the way he does.
It's a shame the CoC doesn't cover giving advice to members that is completely useless, a waste of time and potentially to the point of causing harm.
But no, the main point is not to hurt anyone feelings or to cause offense.
Who is going to have the intensal fortitude and read Langdon's the riot act. I tried in the beginning to guide him in the right direction but he would appear not to care.
You admins need to take action, I'm sick to effing death in having to make his posts an issue in the hope something will be done to rectify his behaviour. Until then I will keep raising this issue, or you can just ban me. I don't care much, Ive lost faith in every single one on the Admins on this site. You aren't doing a single thing to protect other forum members, especially new ones from his nonsense. At this juncture you all disgust me.
  • unknown
22 Nov 2025 12:31
Replied by unknown on topic Chinese Mesa 7I92 from aliexpress NEW
You did not buy a Mesa card. You bought a Chinese clone hoping to save some money then expecting help.
The best thing you can do is read the Linuxcnc documentation.
But any of the quirks with the card itself you are going to have get support from the vendor.
Without knowledge of the schematics no one can say whether it will operate electrically as original Mesa 7i92.
What you have done is bought a rip-off and now expecting those that are loyal to Mesa Electronics to dig you out of hole.

And to be perfectly honest there are plenty of threads regarding configuration, plenty of resources on YouTube and plenty of advice in the docs.
  • unknown
22 Nov 2025 12:18
Replied by unknown on topic Updating from LINUXCNC - 2.8.4-23, Mint 20.3 - gmoccapy lathe structure
Until the issue with the 5i25 is sorted no amount of reinstalling Linuxcnc is going to fix the issue.
It's quite apparent that the config was working before. What is stopping it now from working is the error with 5i25.
It's akin to trying to get a car going by replacing the engine when the ROM in the ecu is bad.
  • Muzzer
22 Nov 2025 11:58
Replied by Muzzer on topic Updating from LINUXCNC - 2.8.4-23, Mint 20.3 - gmoccapy lathe structure
Many thanks for the helpful suggestions! Notwithstanding the ever present Domestic Manager and her task list, I will have a go at those suggestions.
  • Cleaning and reseating the connectors sounds like a good plan. As you say, software doesn't simply evolve of its own accord. My mobo has only one ISA slot.
  • I have a spare SSD, so will do the install on that, leaving the existing system untouched.
  • "Really all you need to port across is your ~/linuxcnc folder" - I will look into this. Presumably that folder contains config data rather than executables etc.
  • If I'm still struggling with the 5i25 bit, I'll post a more focused query and perhaps PCW will be able to point me in the right direction.
Thanks again.
  • Sekai
22 Nov 2025 11:19 - 22 Nov 2025 11:29
Chinese Mesa 7I92 from aliexpress NEW was created by Sekai
Hi.I bought a mesa card from aliexpress to power my lathe.The board works with 10.10.10.10 it pings and output that gives me with command:sudo mesaflash --device 7i92 --addr 10.10.10.10 --readhmid
Code:
configuration Name: HOSTMOT2 General configuration information:   BoardName : MESA7I92   FPGA Size: 9 KGates   FPGA Pins: 144   Number of IO Ports: 2   Width of one I/O port: 17   Clock Low frequency: 100.0000 MHz   Clock High frequency: 200.0000 MHz   IDROM Type: 3   Instance Stride 0: 4   Instance Stride 1: 64   Register Stride 0: 256   Register Stride 1: 256 Modules in configuration:   Module: WatchDog   There are 1 of WatchDog in configuration   Version: 0   Registers: 3   BaseAddress: 0C00   ClockFrequency: 100.000 MHz   Register Stride: 256 bytes   Instance Stride: 4 bytes   Module: IOPort   There are 2 of IOPort in configuration   Version: 0   Registers: 5   BaseAddress: 1000   ClockFrequency: 100.000 MHz   Register Stride: 256 bytes   Instance Stride: 4 bytes   Module: LED   There are 1 of LED in configuration   Version: 0   Registers: 1   BaseAddress: 0200   ClockFrequency: 100.000 MHz   Register Stride: 256 bytes   Instance Stride: 4 bytes Configuration pin-out: IO Connections for P2 DB25 pin#             I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir  1                      0   IOPort       None            14                      1   IOPort       None             2                      2   IOPort       None            15                      3   IOPort       None             3                      4   IOPort       None            16                      5   IOPort       None             4                      6   IOPort       None            17                      7   IOPort       None             5                      8   IOPort       None             6                      9   IOPort       None             7                     10   IOPort       None             8                     11   IOPort       None             9                     12   IOPort       None            10                     13   IOPort       None            11                     14   IOPort       None            12                     15   IOPort       None            13                     16   IOPort       None            IO Connections for P1 DB25 pin#             I/O   Pri. func    Sec. func        Chan     Sec. Pin func   Sec. Pin Dir  1                     17   IOPort       None            14                     18   IOPort       None             2                     19   IOPort       None            15                     20   IOPort       None             3                     21   IOPort       None            16                     22   IOPort       None             4                     23   IOPort       None            17                     24   IOPort       None             5                     25   IOPort       None             6                     26   IOPort       None             7                     27   IOPort       None             8                     28   IOPort       None             9                     29   IOPort       None            10                     30   IOPort       None            11                     31   IOPort       None            12                     32   IOPort       None            13                     33   IOPort       None 

The problem is i dont know how configure linuxcnc. I have the doc from the seller uploadnow.io/f/9v0gkpb
This is my first time with mesa card.
  • T.Frei
22 Nov 2025 10:10
PoKeys57CNC HAL component was created by T.Frei
Hi all,
With Windows 10 getting slowly obsolete, and also since I also was not 100% happy with Mach4, I looked into LinuxCNC as an alternative.
I already found the other topic on the PoKeys HAL driver , however was not succesful getting Dominiks component to run.
Before reverse engineering that component, I thought to myself "how hard could it be?". I do not need many features for my setup.

Said and done, here is my own component to run a 3-axis mill: PoKeysMotionComponent on GitHub.
I still have some things in the backlog to do, but you can already use it. Hopefully it helps someone out there.
 
  • abs32
22 Nov 2025 09:49 - 22 Nov 2025 09:54
Replied by abs32 on topic How to fix "Queue is not empty after probing"
it seems to me that this is "not sporty". Together we must force the correctly given commands to be executed correctly. G38.3 should not produce such errors.
You suggested changing the interface to qtplasmac, but it uses the same g-code and linuxCNC. And I have a milling machine.
Unfortunately, my level (of knowledge) is not yet such that I immediately understand the "right path" from the hints of the M130. I would appreciate more precise instructions.
Editing the source code file, as suggested by AkkiSan and Aciera, in my opinion = the right path. And I would be ready to experiment. But I need instructions on exactly how to get v2.9.7 to use these changes.
  • rodw
22 Nov 2025 09:44
Replied by rodw on topic How to fix "Queue is not empty after probing"
My recommendation is to migrate your plasma machine to use qtplasmac which has obsoleted the thcud component.
It does not use g38 but probes with external offsets and also retains your probe away from the material.

I have used gcode probing for plasma without issues. I suspect your problem is related to your gcode given M130 is a custom gcode.

I would do some testing of your probe moves as MDI commands to isolate your GUI and custom gcode
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