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.

注解

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:

提示

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

注解

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

The image below shows the connections on a breadboard.