@Kengs: Thanks for the script ! I'll try this out.
I don't think Uno and Linear are different from a pure command point of view. It's the same firmware for all stargo mounts.
Only motors have different calibration parameters.
:X590# gives no results for me which may be the major problem, due to a too old firmware.

@Wolfgang: Thanks ! Don't worry, no hurry here. Thank you for answering, as I said I will upgrade the firmware and let you know.

In the same time I contacted Avalon to ask if they can share the protocol with us, It may save a lot of time avoiding reverse engineering the mount. With a bit of luck they may accept sharing the protocol. It's in their interest to make the thing available on all platform especially Indi which may become the next new standard.
If they're afraid to be copied, it's a pity, reverse engineering a clear text commands protocol over serial device is quite easy, plus they took the LX200 as a base so no industry secrets here.

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