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Jean Philippe,

Thank you for sharing these. I greatly appreciate your generosity.

Am I correct I. My thinking that the magic for this is in the spindle.hal file?

Rich

Inching my way foreward.
Have a hal and ini for modbus now, and im getting an "out of range" error.

This happens if the drive in on or off, and im seeing no leds on the adapter. so perhaps the adapter is not enabled? Does it require a driver?

The chip on the adapter is CH340

Great, in meantime I am wondering, rough estimation could it be all logic (6x uart + quadrature logic + 6 to 8 stepgens + 1 smart serial) packed to 6i25 or 7i92?
I think that I don't need C signal from encoder to count full revolutions.
Yes uart parameters are fixed.
I am seeing the next sequence, LinuxCNC will issue power up of servo drivers and encoders would be connected both to drivers and RS422 to TTL converters (encoders are RS422), so there would be 2 listeners per encoder on RS422 network (think this should not be a problem for RS422).
Drivers will issue power on for encoders and this is trigger for them to send data.
After RS422 -> TTL conversion then will be signal isolation and then fpga.

Review the config in settings section to make sure everything is there that needs to be. 30-40 seconds means something is wrong in the config most likely. Just go through line by line and read everything carefully to make sure you didn't overlook anything. Should fix your issue. When in doubt compare to the SIM config. If it works as expected then go through your machine config again and find the error or missing item.