This is an issue that I have already submitted several times without a satisfactory response.
IT IS NOT AN ISSUE THAT CAN BE SOLVED BY THE COMMUNITY FORUM, PARTICULARLY THE CELESTRON COMMUNITY.
IT IS A CODING ISSUE IN SKY SAFARI 6 PRO FOR THE MAC.
SS6P makes a connection to the iOptron CEM 40 using the Connection: usbserial-D306TFRL but receives an error message that the scope is not responding. The selected scope type is "iOptron CEM/iEQ Pro/AZ Mount Pro" (as confirmed by iOptron) and the Mount Type: Equatorial GoTo. A high quality USB cable connects the USB port on the body of the CEM40 to my MacBook Pro running OS 10.12.6. I have not problem connecting my other iOptron mounts and my Losmandy G-11 to SS6 using a Keyspan USA-19HS USB to serial adapter but the difference is the CEM40 uses a direct USB cable and a virtual com port instead.
Following a conversation with iOptron techs the problem seems to be with properly addressing/utilizing the virtual com port. The CEM40 can communicate via USB with the latest version (3.3.9) of Kstars/Ekos software and works through WiFi with SS6P on my iPad Pro when the connection is made by ASIair. For direct communication with telescope mounts, particularly when used in an observatory setting, the trend seems to the use of USB thus eliminating the the need for a serial/USB converter.
Since my CEM 40 will be used in my observatory I would like to be able to use it with SkySafari through a cabled connection to my Mac. If this type of connection is not going to be supported by SS then I will seek other telescope control software but SS is by far my preferred application.