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If standard Modbus works one can wonder why there is a hal componenet for this vfd?
The old Huanyang vfds use something similar to but not quite Modbus so there it is needed.
 

Yeah I'd take what that user says with a grain of salt, unfortunately he can be a little unreliable or completely off the mark.

Try this command to see what is installed

Confirmed is a SW issue.

I replaced the hy_gt_vfd driver with mb2hal, which is a generic modbus HAL component, no HW changes, and it works.

nice....thanks

For configurations with specific daughtercards, the daughtercard 
name is included in the file name and you can use the .pin file
to determine the content and pinout of the firmware, for example
the 7i76eu_7i76x1_pktv2d.pin file shows that the configuration
includes a V2 PktUART ( the TX and RX halves )

Thx.
Just out of curiosity…
Is there an overview what all those firmwares do / are meant for?

Or how could I have found that out myself?

Regards

7i76eu_7i76x1_pktv2d.bin 

Would be the correct firmware

You will also need to update LinuxCNC to the lastest version
sine the hm2_modbus driver is quite new.

 

this post says that vnc is preinstalled.

forum.linuxcnc.org/38-general-linuxcnc-q...time?start=30#328405

however - thx for your feedback, I will just manually install one.