Fldigi is a Digital modem program for Linux, Free-BSD, OS X, and Windows (XP, NT, W2K, Vista and Win7).
As I could never remember the exact settings for my Icom IC7100 with Fldigi, I have decided to add them here.
I also use the following hack to get hamlib to talk to the IC7100. Using this trick, hamlib talks to the IC7100 as if it’s a IC7000, which seems to work well enough to set/get modes, frequencies, power, meter readings, and PTT.
sudo grig -m 360 -r /dev/ttyUSB0 -s 19200 -c 0x88 -p -P