FrSky F.Port is a protocol developed by FrSky Electronic Co., Ltd., designed for communication between receivers and connected devices like servos or sensors. It is a one-line bus system that supports both control and data transmission, operating at a higher speed (115200 baud per second) compared to its predecessor, S.Port.

Specifications

Physical Layer
Message Format

Physical Layer

The physical layer of the FrSky F.Port protocol utilizes UART (Universal Asynchronous Receiver-Transmitter) communication at a baud rate of 115200.

Uart Configuration

When it comes to the configuration of the UART communication for SBus, it uses the following format:

8 bits of data: Each data frame consists of 8 bits, representing the information being transmitted.
No parity: It does not use parity bit instead it uses a checksum at the end of the whole packet.
1 stop bits: Following the data bits and the parity bit, there are 1 stop bits. Stop bits indicate the end of a data frame and provide timing for the receiving device to process the data.

Message Format

For the data format and more details go to this link