Jasem, I got it working! I downloaded the CP210x Macintosh OS VCP Driver v6 (serial driver) and once installed, the Esatto connected in exactly the way it connects with Linux. The driver is here: CP210x VCP Mac OSX Driver I now have all my devices connected via Mac OSX and functioning. CEM120 EC2 ASI 1600Mm pro ZWO Filter wheel SX Loderstar X2 Esatto Focuser Nexdome AAG Cloudwatcxher NG Read More...