macOS users need to install the CP210X serial port driver before they can identify the device. Kstars is available as an astrophotography software option.
CP210X Serial Port Driver
Serial port driver used by the UMi 17 and UMi 17 Lite. macOS can identify devices only after installation.
The CP210X driver has been distributed as part of the Linux kernel since v2.6.12, thus no need to download further files to detect the mount. Kstars is available as an astrophotography software option.