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Seeing as the RMP 210 does have a spec sheet yet, I would guess it is pretty new and therefore uses the new comm protocol like the rmp440, which is known not to work. I don't know that for sure, but since I cannot check the spec sheet I cannot know.

That being said, the exception you are actually getting is "Permission denied", which means you may not have permission to open the serial port. Make sure you are part of the correct group on Linux, usually dialout or uucp, and reboot the computer, then try it.