Thanks for replying Rob and looking into this.      I have done the same thing and tried with the Simulator and get a "no connection" error.  both in Kstars versions Mac 3.5.5 and 3.5.3 that I have.    As mentioned in previous post, I also dug into the Mac-INDI directory and find a 'header' (not sure of the term?) but apparently no script to do anything.  This 'driver' also is not under the Rigel heading in the directory list.   I'm no linux guru, and have only fumbled around in Unix a long time ago.  But appears to me the driver script in GitHub never got to the Mac INDI directory.  But I have no idea if that script works or needs work.   Here is all I find,   copied and pasted from my Macs' terminal window:Last login: Tue Oct 26 21:47:21 on ttys001Rons-Mac-mini:~ ursamajor_1$ /Applications/KStars\ 3.5.5.app/Contents/MacOS/indi/indi_nstep_focus ; exit;

I asked previously if I copied the driver script from the GitHub hub link,  if that would work?   I looked at some other drivers in the directory and they seem to have long scripts.  But some others have none similar to the nstep.    I know others have reported the same problem with the Baader Steel track focuser.   So more drivers may be missing than just the Rigel systems driver or maybe there is no Mac compatible driver yet?   Hopefully you can sort this out and let us know what can be done.     your work is much appreciated.      Ron 

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