You need to go back to the Spirit manual and read up on the Spirit Wiring.
https://manual.spirit-system.com/index.php?title=WiringIn short, there's a big difference between S-BUS and S. Port.
- S-BUS is a one-way connection for sending channel command from the receiver to the FBL. It is required in order to send commands from the Tx to the RX, from the Rx to the FBL, and then the FBL send those commands to the Servos connected to it.
- S.Port is a two way communication port for passing telemetry and configuration data back and forth between the Rx and the FBL. It is NOT required in order to get a functional Helicopter, but if you want to get telemetry and Spirit integration in your transmitter, then you need to connect it.
Telemetry and
integration are 2 different things.
Telemetry provides you information about your flight conditions, battery voltage, battery amperage, signal strength (RSSI/VFR), rotor RPM, vibrations, etc.
Integration is the ability to use a script to read the FBL settings, and adjustem from the radio. This way, you don't need t connect the FBL a computer in order to adjust your settings.
With the setup shown above, you will still need to plug your FBL into a PC with the USB cable to make your original settings. Once everything is set, you remove the USB adapter, and plug the 2 wires show in the diagram (S.Port and GND), and from this point on, any futures adjustments can be made from the Transmitter.
If you need further help, please send me a PM, I don't want to derail this thread from its original purpose