output should read similar to this:
crw-rw-rw- 1 root dialout 188, 0 2008-04-21 19:51 /dev/ttyUSB0
REBOOT. None of my applications would acknowledge the CI-V device's connection until after reboot, for whatever reason.
Repeat the above process if you have other serial-to-usb adapters that compete on your system.
If your application normally reads the device from /dev/ttyS0 ... back up your app's configuration and then try /dev/ttyUSB0 instead.
Promptly after reboot, linux programs like gMFSK, sgcontrol and other hamlib-dependent applications were able to read the frequency output of my ICOM R-75, with the Blackcat CI-V interface. I have "limited" control over the R-75 with Smart Gnome Control, but this seems to be a limitation of hamlib0, as this was also 'hit-and-miss' on my standard rs-232 cable, with Icom Control software.