# 用于 Linux 的 S.Bus 驱动

The S.Bus Driver for Linux allows a Linux-based autopilot to access up to 16 channels from a Futaba S.Bus receiver via a serial port. The driver should also work with other receivers that use the S.Bus protocol, including as FrSky, RadioLink, and even S.Bus encoders.

A signal inverter circuit is required (described below) to enable the device serial port to read data from the receiver.


For an S.Bus reciever (or encoder - e.g. from Futaba, RadioLink, etc.) you will usually need to connect the receiver and device via a signal inverter circuit, but otherwise the setup is the same.

Then Start the PX4 RC Driver on the device, as shown below.

# Signal inverter circuit

To start the RC driver on a particular UART (e.g. in this case /dev/ttyS2):

linux_sbus start|stop|status -d <device> -c <channel>

S.Bus 是 inverted UART 通信信号。

# 源代码

S.Bus is an inverted UART communication signal.

The command syntax is:


This circuit is also required to read S.Bus remote control signals through the serial port or USB-to-TTY serial converter.

This section shows how to create an appropriate circuit.

# Required components

  • 1x NPN 晶体管(例如 NPN S9014 TO92)
  • 1x 10K 电阻
  • 1x 1K 电阻


Any type/model of transistor can be used because the current drain is very low.

# Circuit diagram/Connections

Connect the components as described below (and shown in the circuit diagram):

  • S.Bus 信号→1K 电阻→NPN 晶体管
  • NPN晶体管发射→GND
  • 3.3VCC&→ 10K电阻→ NPN晶体管集合→ USB-to-TTY rxd
  • 5.0VCC→S.Bus VCC
  • GND → S.Bus GND

Signal inverter circuit diagram

The image below shows the connections on a breadboard.

Signal inverter breadboard