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X20/X20S and Ethos v1.2.10 User Manual
7. How to configure an FBUS system
The FBUS (previously F.Port 2.0) protocol is the upgraded protocol which integrates SBUS
for control and S.Port for telemetry into one line. This new protocol enables one Host device
to communicate on one line with several Slave accessories. For example FBUS servos are
controlled on one daisy-chained connection while also sending their servo telemetry back to
the receiver on the same connection. All FBUS devices connected to an ACCESS receiver
(Host) can be configured wirelessly from the ACCESS radio on this protocol.
In this example we will configure 2 Xact servos to work with our Basic Fixed Wing Airplane
example in the tutorials above on the Aileron channels 1 and 5.
Step 1: Download the latest firmware
FBUS requires use of the latest firmware for receivers and devices. For example, the
firmware for the Xact servos must be at least v2.0.1.
Go to the Download section of the FrSky website
https://www.frsky-rc.com/download/
and download the relevant receiver and FBUS device (such as Xact servo) updates.
Step 2: Flash the firmware
Copy the downloaded firmware files to the Firmware folder on the SD card.
Got to System / File Manager and scroll to the relevant firmware file. In the example
above we have chosen the update file for the Xact HV5201 servo. The file date is 2022-
02-15, which is for the v2.0.1 version.
Plug the servo lead into the S.Port connection at the top of the radio. The white or yellow
lead goes to the side with a notch. Tap on the highlighted filename, and select ‘Flash
External Device’. Flashing will commence, with a bar chart showing progress.
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