Below is the connection diagram diagram for the iEFIS-Lite to V6 Com Radio. You can use either RS-232 Port 1 OR RS-232 Port 2 on the iEFIS-Lite (Discovery-Lite, Explorer-Lite, Challenger-Lite). You can also use any of the RS-232 Ports on the iEFIS Extender, if connected.
When connecting the V6 to the iEFIS Lite you can also connect the EFIS Audio alert output (pin 3 on Power Connector) to the AUX Primary Audio Input (pin 20 on the V6 Radio), to have voice alerts through your headset from the iEFIS. It is recommended that you run this through a panel switch so that you can turn off audio and voice alerts if they become too intrusive.
Then, exit setup to save settings and then restart the system (turn power off and on again). Restarts are required between RS-232 allocation changes.
You can verify bidirectional communications by changing the frequency on the radio and watching it change on the EFIS radio indication, and vice versa: