In this mode you tune the radio to a new frequency, and then press the ENTER key on the controller's keypad, and this will force the controller to obtain the new frequency from the radio and re-tune the antenna. I have found that the Semi-Auto mode works the best. I powered my CT-17 from an accessory output of my main power supply, but when I used my IC-7600 I could power it from the rear accessory socket.
Obviously you will need to set the port speeds the same for both the C-M controller and the radio, and 9600 Baud is fine.
If you have the latest firmware installed in the C-M controller (Cml_322.tes) then the auto-detect feature now works correctly at all port speeds, and you will be able to 'discover' the CI-V address of the transceiver. You would need a translation device that would take RS-232 and convert it up to the USB protocol, and then connect that to the transceiver which would internally convert it back down to RS-232, and, as far as I'm aware, no such translation/conversion device exists. Consequently there is no way to use this USB 'B' socket to directly connect the C-M controller to the transceiver, since the controller's interface is RS-232, not USB. One part of the bridge connects to what is essentially a sound card interface allowing you to send and receive audio data, the other part of the bridge is connected to a USB to RS-232 converter allowing you to control the transceiver by means of a CAT program. Think of a client as being like a printer, mainly receiving data. The USB 'A' socket on a computer signifies that this is a server. On the rear of the IC-7300 is a USB 'B' socket, signifying that this is a 'client' device, not a 'server'. Unfortunately, the short answer is that the only way for the C-M controller to communicate with an IC-7300 is via the CT-17 interface.
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