Thanks Rob, If i get it right you're saying I need a Mac compatible driver for Serial-USB converter for the N-step motor. The Rigel has a serial connection input off the stepper motor and USB 'module' output to the Mac. I know the port and cables all work fine, since everything else in kstars runs fine from that USB port and a hub. The Rigel USB Nstep converter driver is Windows & ASCOM only, which of course is not Mac compatible and why INDI should work instead if the program is in Kstars. I can try it tomorrow with a Mac-compatible Keyspan serial-USB converter which I've used for other astro-devices for years. I'll update with what I find. Ron

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