FrSky Protocol Guide - Hammerhead RC 2025

FrSky Protocol Guide - Hammerhead RC 2025

For newcomers to FrSky's radio architecture, it can be confusing to determine which receivers are compatible with the radio you own and how those receivers are named, to make it easier we have made this guide to understand what it all means and how to select the correct Transmitter or Receiver for your application.

Definitions used with FrSky Radio's and Receivers:

TD = Tandem
TW = Twin
Archer+ = ACCESS

R = Standard Rx
SR = Stabilized Rx (Includes a built in Gyro)
GR = Glider Rx (Includes a built in Vario)
MX/Mini = Micro Rx (No direct PWM pins, SBus or FBus connection)

Receiver naming convention:

FrSky follows the below naming convention for receivers made since 2022:
RF Type     / Rx Type and No of PWM Pins / Alterations 
AAAA        / AA##                                            / AA

Examples:
TD R6 = RF Type: Tandem (TD) / Rx Type: Standard with 6 PWM outputs / No Addons
TD SR10 = RF Type: Tandem (TD) / Rx Type: Stabilized Rx with 10 PWM outputs / No Addons
TW GR8 = RF Type: Tandem (TD) / Rx Type: Glider Rx with 8 PWM outputs / No Addons
TD R6FB = RF Type: Tandem (TD) / Rx Type: Standard with 6 PWM outputs / FBus Servo Types only

Note: Radios we stock are compatible with older architectures like ACCST & R9M. However, we do not stock those receivers (yet!)

Receiver RF Types We Stock:

  • TD (TANDEM): The latest architecture for FrSky radios, combining 2.4GHz and 900MHz into a single, continuous data stream.

  • TW (TWIN): Designed for dual 2.4GHz operation, offering clean, long-range capabilities and ultra-fast speeds. 

  • Archer+ (ACCESS): Designed for single 2.4GHz operation, updated design since the release of the TW protocol, this receiver type is your go to for budget friendly builds

Radios We Stock and Compatible Receivers:

X14: TW (TWIN) & Archer+ Receivers
X14S: TW (TWIN) & Archer+ Receivers
XLite-S: TW (TWIN) & Archer+ Receivers

X18: TD (TANDEM) & Archer+ Receivers
X18SE: TD (TANDEM) & Archer+ Receivers

X18RS: TW (TWIN) & TD (TANDEM) & Archer+ Receivers
X20RS: TW (TWIN) & TD (TANDEM) & Archer+ Receivers
X20PRO: TW (TWIN) & TD (TANDEM) & Archer+ Receivers

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