FrSky XSR-SIM USB Dongle Bind Guide for RC Simulators

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FrSky XSR-SIM USB Dongle Simulator Bind Guide

This guide explains how to bind the FrSky XSR-SIM Wireless USB Simulator Dongle to a compatible FrSky transmitter for RC simulator use.

The XSR-SIM allows your FrSky radio to connect wirelessly to your computer as a simulator controller. Once bound, you can fly compatible RC simulators using your own transmitter instead of a wired trainer cable.

Important: The FrSky XSR-SIM uses ACCST D16. Do not use ELRS, DSM, SFHSS, ACCESS-only, or other protocol modes for this dongle.

Compatible Radio Mode

  • FrSky ACCST D16 mode
  • Compatible FrSky transmitters and module systems
  • 8 proportional channels and 8 switch channels, configured from the transmitter side
  • Wireless USB simulator use on a computer

Before You Start

  • Make sure your transmitter supports FrSky ACCST D16.
  • Use the internal RF module or a compatible FrSky external module.
  • Plug the XSR-SIM directly into a USB port on your computer.
  • After binding, your simulator may require controller calibration before flying.

ETHOS 26.1.0 Setup Example

On ETHOS 26.1.0, use the following RF system setup before binding the XSR-SIM:

Internal Module Setup


2.4G FSK / Bind Setup

ETHOS setup path:
RF System → Internal Module → Protocol: ACCESS / ACCST D16 → 2.4G FSK Protocol: ACCST D16 → Bind

ETHOS 26.1.0 Settings

  • Go to RF System.
  • Select Internal Module.
  • Set module state to ON.
  • Set protocol to ACCESS / ACCST D16.
  • Under 2.4G FSK, set protocol to ACCST D16.
  • Set channel range to CH1 - CH16.
  • Press Bind.

How to Bind the FrSky XSR-SIM USB Dongle

Step 1 — Put Your Transmitter Into Bind Mode

On your FrSky transmitter, go to the RF setup page. Select ACCST D16 mode, then select Bind.

Step 2 — Put the XSR-SIM Dongle Into Bind Mode

Press and hold the BIND button on the XSR-SIM USB dongle.

While holding the BIND button, plug the dongle into your computer USB port.

Step 3 — Confirm the LED Status

During binding, the red LED will flash and the green LED will turn on. This indicates that the binding process has completed.

Step 4 — Exit Bind Mode

Turn off bind mode on your transmitter, then unplug the XSR-SIM dongle from your computer.

Step 5 — Reconnect the XSR-SIM Normally

Plug the dongle back into your computer without holding the bind button.

Step 6 — Check Normal Operation

The green LED should flash and the red LED should remain off. This means the XSR-SIM is receiving commands from your transmitter.

LED Status Reference

Green LED Red LED Status
On Flashing Binding
Flashing Off Normal Operation
Off Flashing Signal Lost

Simulator Setup Notes

  • After binding, open your simulator and select the XSR-SIM as the controller input device.
  • Run the simulator controller calibration process before flying.
  • Set channel order, switches, throttle hold, flight modes, rates, and curves from the transmitter side.
  • If the simulator does not respond, unplug the dongle, restart the simulator, and reconnect the XSR-SIM.

Troubleshooting

Issue What to Check
Will not bind Confirm the transmitter is using FrSky ACCST D16 mode.
ETHOS bind fails Confirm the internal module is ON and the 2.4G FSK protocol is set to ACCST D16.
Green LED flashing / red LED off Normal operation. The XSR-SIM is receiving commands from the transmitter.
Red LED flashing / green LED off Signal lost. Check that the transmitter is powered on and bound.
No simulator input Confirm the simulator sees the XSR-SIM as a USB controller and recalibrate the radio in the simulator settings.
Note: Once the XSR-SIM is bound to your transmitter, the bind process usually does not need to be repeated unless the transmitter/module or dongle is replaced.

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