Progress: I've learned, at long last, that a driver must be installed for the RS232 to USB adaptor. My apologies for dragging you through this quagmire.
1. My adaptor apparently uses a Prolific chip. I downloaded and installed the appropriate driver from Prolific, and, oh my, EKOS recognizes the IEQ45 mount using the ZEQ25 profile.
2. However, the mount is not responding to any "movement" controls from the Mac. The mount WILL move when linked to the 8407 HC.
3. The iOptron website suggests using the FTDI chip on the adaptor. I have ordered an adaptor with that chip. I'm not optimistic, but what the heck.
As always, any insight or advice is welcomed!! Moving the mount would seem to be an integral part of the installation ;~).

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