The 3.5mm (1/8") data jack is a straight serial port, and I'd give that a try. Ken > On Jul 26, 2022, at 15:03, Michael Nadler KI7QIB <michael.nadler at gmail.com> wrote: > > Is CHIRP able to interact with the ICOM-7100 via the mini-USB port? Do I have to use the RT-Systems FTDI cable into the audio port?