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I would consider integrating a drive using RS485 a more advanced subject.

Start with reading the Linuxcnc documentation, and begin with a basic configuration for running your machine without spindle control. Then after you have a better handle on Linuxcnc, and the basics of Hal programming, try to integrate the modbus spindle control into your configuration. There may be an existing modbus driver compatible with your drive. (I don't know, never used one.) If so that would probably make integrating RS485 control much simpler. But if not you can always make the generic Mb2hal driver work, but this is a bit of a chore to set up and configure. (I have done this before.) The generic RS485 drivers are a lot of work to set up because you must research all of your drive's modbus settings and communication parameters, and every drive (even different models from the same manufacturer can) have different parameter arrangement, there is no "standard" way drives do modbus.

If you are following steps which I have desribed somewhere here at the forum... It has to working properly every time on startup.. I am running profibus, profinet and canopen on single koppler in same time over ethercat

After koppler restart have a look at command -

sudo systemctl restart ethercat.service

... But U are decribing other type of problem... I am currently working on C# console app which will generate us configuration from ethercat slaves && ethercat pdos commands ... I have beta version but it is not too adult to outcome on public... Do U have a TC3 project?

@Lcevette,

that is awesome!!
We hope so.

I had to add extra logic to the arc-helix.
When the arc-helix is trimmed at the front, i had to update the center point.
As the old center at the front is off plane after trimming.

The result looks ok now. Helixes in plane G18 & G19.
Deviation = 5.
 

If there are shorter segments, the clothoid fillet previews to be tinyer.

Also working on the look ahead now.

Press F11 or F12 or on some PC's F8 after power on, see if you can select that SSD to boot from and also notice if there is more than one entry for it, usually the name of the SSD as one entry and another with UEFI SDD, try both.
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Edit:
Is it an ACER?
those require setting a BIOS password to be able to disable secure boot.

that is awesome!!

Thank you for the reply.
I did what you suggested, before my post, and the motherboard does not recognize the SSD. Strangely it displays a very fast message that I was able to see:

There is no vBIOS support detected in this card.
'BIOS CSM/UEFI Mode' settings in BIOS will be changed to 'UEFI'

and automatically it moves to the BIOS screen, and the previous changed settings are converted to UEFI again.
Note that I do not have a separated graphics card.

Disable "secure boot" in BIOS.
Also enable "legacy" or CSM or both.
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Changing from MBT (should be MBR or Master Boot Record) to GPT will destroy any info on the drive, so to do that would require cloning the partition (not the drive) to another drive, switching partitioning and then cloning back that partition. Either way you look at it, very dangerous and not much chances of working properly.
And more importantly, that is not the reason for failing to boot.

hello,
Thank you for your answer.
Sorry for the late reply. I've been a bit ill and didn't get a chance to test it.

I have changed the line as described.
It actually seems to be working better now.
I still have the problem that when I restart the coupler it doesn't work right away... it only works after I have loaded the configuration once with TwinCAT. I think I'll have to see which CoE register might have a different value.