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FrSky 3/16CH SBUS ACCST Telemetry Receiver for FPV Multicopter W/Smart Port + CPPM


Part Number: FRS-X4RSBCPPM

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FrSky, manufacturer of high performance, reliable and affordable openTx transmitters and accessories

Due to popular demand, FrSky has released the 2015 version X4R-SB with CPPM output. This upgrade turns output 1 into 8-channel CPPM, with the rest of the outputs becoming additional PWM channels. On the X4R-SB CPPM and SBUS are both available without the need of reflashing or jumpering any signal pins.

There are two binding options:

  • Binding without the jumper retains the original X4R-SB behaviour, PWM on channels 1-3 and SBUS on output 4
  • Binding with jumper on signal pins 2 & 3, turns output 1 into CPPM channels 1-8, outputs 2 & 3 become PWM channels 9 & 10, and output 4 is still SBUS.
NOTE: To use this with Taranis radios that had EU compliant firmware installed, you need to flash the X4R-SB CPPM with the EU version firmware also. Firmware can be download on FrSky website.

  • Smart Port enabled, realizing two-way full duplex transmission
  • External analog telemetry port (AD2) for basic voltage monitoring
  • Lighter weight and physically smaller than X8R and X6R receivers
  • With RSSI PWM output (0~3.3V) on board
  • Output options: PWM, CPPM and SBUS output options, up to 16 channels available


  • Dimension: 40*22.5*6mm (L x W x H)
  • Weight: 5.8g
  • Number of Channels:
    • Used as X4R-SB without CPPM: 3/16 Channels
    • Used as X4R-SB with CPPM: 2/16 Channels
  • Operating Voltage Range: 4.0~10V
  • Operating Current: 100mA@5V
  • Operating Range: full range (>1.5km)
  • With RSSI output on board: PWM voltage output (0~3.3V)
  • Firmware: User Upgradable (Default is non-EU firmware)
  • Compatibility: FrSky X-series modules and FrSky transmitters. Does not work with D-series modules

  • NOTE: X4R-SB with EU firmware will only work with FrSky modules and transmitters that also have EU firmware.