solved
I have built a civ with max232 (powered 12 volt external)
radio:
max232 interface direct com2
connect 3.5mm plug on cat icom
setting rrc radio:
COM2 mode 2 icom
COM2 baud rate 9600
COM2 8 data bits
COM2 stop bits 1
COM2 parity 0
COM2 terminator (hex) 00
controller:
frontal connect usb port on pc
rrc controller setting:
COM2 mode 2 icom
COM2 baud rate 9600
COM2 8 data bits
COM2 stop bits 1
COM2 parity 0
COM2 terminator (hex) 00
Use as USB Com Port COM2 yes
apply change and restart rig and ric radio controll
open after setting icom ham radio delux model, baud rate 9600, no dtr, no rts
and functions regularly
hello from iw9gtd