if you have all setup to work with an IC-7100 with frontpanel, connect the CT-17 from the Radio-RRC com2 to the Radio-CI-V port. And set up com2 in both unit to mode 2 (Icom CI-V) and the same baudrate in the radio and RRCs as you want to use 9600 baud for example. If you wan't to use USB to the PC activate USB for com2 in the control RRC. Connect the RS-BA1 to the virtual comport which correspond to RRC-com2.( see device manger)
73 de mike