This is a digital communication protocol used in R/C receivers.  It uses digital serial data communication technology to transmit control signals between your receiver and servos.  More than that, it allows us to transmit many channels digitally from the receiver to the flight controller.  SBUS allows us to digitally transmit up to 16 channels per receiver (frsky)  The other advantage of SBUS is that it is a very fast protocol.

CPPM and PWM both have around a 60ms-80ms delay, and SBUS only has a 10ms-20ms delay.-  Many top pilots claim that they can feel the difference.

A single S.Bus cable can carry signals to as many channels as your transmitter can handle. You no longer have to worry about plugging in the wrong servo to the wrong channel, because each servo knows what channel it is dedicated to in advance.

SBUS can be found on the popular Frsky X4R-SB receiver and the protocol was originally created by Futaba, and is found on the Futaba SBUS line of receivers.


  • SBUS is faster than PPM and PWM
  • Different Error Handling
  • Smoother, better resolution RC inputs



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One reply on “SBus

  • jon

    I would like to use an SBus protocol analyzer to view the data stream on my signal
    what type or model name would you reccomend that i use

    thank you


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