More information:
When I try to connect, I get Error code 206 in TheSkyX.
I don't have anything plugged into the USB Hub on the cameras.
I don't have anything else plugged into the USB ports on the pi.
I have separate power supplies for the camera and pi.
I've tried different power supplies for the camera and pi.
I've used the same port and cable for the USB connection for the cameras on the Pi.
I've used different cables and ports for connecting the cameras to the Pi.
I've tried connecting the ASI1600MM-Cool (non pro) and an ASI120MM-S at the same time as the ASI183MM Pro. I can choose them in the Settings dialog and they connect fine. It is only the ASI183MM Pro and ASI1600MM Pro cameras that I cannot connect.
Craig