[chirp_devel] help needed

I am working with several radios some of which I expect not to work so no problem. However if I hook up a Baofeng UV-6 and ask chirp to do a download via ttyUSB0 under Ubuntu 14.04 I get "Radio did not respond" error. Nothing else shows in the log even if I use debug level and verbose settings.

Radio connected with it's proper cable and volume on full (though I have tested it at various volume settings). I get the expected errors if the cable is not plugged into the computer so I assume it is reading the port correctly.

Any suggestions on what I may be doing wrong?

Thanks Tom