FrSky RX4R
Four servo outputs plus SBUS, aimed at small aircraft rather than quads.
Recorded specification
Every value carries the source it was read from. A property with no recorded source is marked as such rather than presented as a fact. If one of them is wrong, tell us: it is the fastest way it gets fixed.
ACCST D16 mode
| Property | Value | Source |
|---|---|---|
| Control link protocol decides fitThe transmitter-to-receiver RF protocol. NOT the same as the receiver-to-FC serial protocol. | FrSky ACCST D16 | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| Receiver output protocol decides fitHow the receiver talks to the flight controller. CRSF is used by both ELRS and Crossfire. | SBUS | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| Antenna connector decides fit | U.FL / IPEX | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| WeightBuild-critical rather than compat-critical: needed to answer registration and class questions. | 2 g | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
- FrSky product specificationschecked 2026-07-27
RX4R: Small and High sensitivity (40% increase of the range compared to previous X series receivers); Higher precision PWM and Low latency PWM output; Lower power consumption; Redundancy function supported; Smart Port enabled and telemetry data transmission supported; Battery voltage detection supported; 2 detachable IPEX 4 connector antennas; PCB protection with the comformal coating craftwork. Dimension: 18×17×7mm (L×W×H); Weight: 2g/ 2.4g (with two antennas); Number of channels: 16CH (1-4CH PWM from conventional channel outputs, 1-16CH from SBUS OUT port); Operating Voltage Range: 3.5V-10V; Operating Current: 100mA@5V; Range: >2km; Compatibility: ACCST D16 / ACCESS mode
ACCESS mode
| Property | Value | Source |
|---|---|---|
| Control link protocol decides fitThe transmitter-to-receiver RF protocol. NOT the same as the receiver-to-FC serial protocol. | FrSky ACCESS | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| Receiver output protocol decides fitHow the receiver talks to the flight controller. CRSF is used by both ELRS and Crossfire. | SBUS | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| Antenna connector decides fit | U.FL / IPEX | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
| WeightBuild-critical rather than compat-critical: needed to answer registration and class questions. | 2 g | FrSky product specificationschecked 2026-07-27Quote 1, below the table |
- FrSky product specificationschecked 2026-07-27
RX4R: Small and High sensitivity (40% increase of the range compared to previous X series receivers); Higher precision PWM and Low latency PWM output; Lower power consumption; Redundancy function supported; Smart Port enabled and telemetry data transmission supported; Battery voltage detection supported; 2 detachable IPEX 4 connector antennas; PCB protection with the comformal coating craftwork. Dimension: 18×17×7mm (L×W×H); Weight: 2g/ 2.4g (with two antennas); Number of channels: 16CH (1-4CH PWM from conventional channel outputs, 1-16CH from SBUS OUT port); Operating Voltage Range: 3.5V-10V; Operating Current: 100mA@5V; Range: >2km; Compatibility: ACCST D16 / ACCESS mode
Where to buy
ACCST D16 mode
Our partner does not list this exact product yet. The search below looks for it on their site; the price there is theirs, not ours.
- BanggoodNo product page yetNo price recorded.Search Banggood
This listing does not say which warehouse ships it. Most orders leave China, so expect import VAT and a carrier handling fee unless an EU warehouse is chosen at checkout.
Some links on this page earn us a commission at no extra cost to you, and that never affects any verdict on it. How this is funded.
ACCESS mode
Our partner does not list this exact product yet. The search below looks for it on their site; the price there is theirs, not ours.
- BanggoodNo product page yetNo price recorded.Search Banggood
This listing does not say which warehouse ships it. Most orders leave China, so expect import VAT and a carrier handling fee unless an EU warehouse is chosen at checkout.
Some links on this page earn us a commission at no extra cost to you, and that never affects any verdict on it. How this is funded.
What this fits
Checked against every other product in the catalog by the same engine the planner runs, rule by rule. Where a specification is missing the answer is unknown, which is a different answer from compatible.
ACCST D16 mode
Flight stack (FC + ESC)
✓Works with (6)
- ✓Works with (6)
The flight controller supports SBUS.
Flight controller
✓Works with (3)
- ✓Works with (3)
The flight controller supports SBUS.
Radio
×Does not work with (17)?Not enough recorded specification (20)
All radio · All 32 radio checked against this receiver
- ×Does not work with (13)
ExpressLRS cannot bind to FrSky ACCST D16.
Rule: Control protocol match
- BetaFPV LiteRadio 3 ELRS 2.4 GHz
- Jumper T15 ExpressLRS
- Jumper T20S ELRS 2.4 GHz
- RadioMaster Boxer ELRS 2.4 GHz
- RadioMaster GX12 ExpressLRS
- RadioMaster Pocket ELRS 2.4 GHz
- RadioMaster T8L ELRS 2.4 GHz
- RadioMaster TX12 MKII ELRS 2.4 GHz
- RadioMaster TX15 ExpressLRS
- RadioMaster TX15 Max ExpressLRS
- RadioMaster TX16S MK3 ExpressLRS
- RadioMaster TX16S MKII Internal ELRS 2.4 GHz
Show the other 1
- ×Does not work with (2)
DJI integrated control cannot bind to FrSky ACCST D16.
Rule: Control protocol match
- ×Does not work with (2)
TBS Crossfire cannot bind to FrSky ACCST D16.
Rule: Control protocol match
- ?Not enough recorded specification (16)
The control protocol of one of these is not recorded yet.
Rule: Control protocol match
- FLYSKY PL18 Ultra Paladin 18CH
- Flysky ProArt PA01 2.4GHz 18CH
- FrSky TWIN X Lite RII
- HelloRadioSky V12 CNCMAX 2.4GHz Dubbelfrekvens
- HelloRadioSky V14 MAX 2.4GHz Inbyggd
- HelloRadioSky V14 MAX/MAX R9 2.4GHz
- HelloradioSky V14 MAX R9 2.4GHz
- HelloRadioSky V16R Inbyggd 1W ELRS
- HelloRadioSky V16R MAX R9 Inbyggd
- iFlight Commando 14 2.4GHz/900MHz Dual-Band
- iFlight Commando 8 Pro 2.4GHz/900MHz
- Jumper T22 ELRS 2,4 GHz/915
- ?Not enough recorded specification (4)
The band of one of these is not recorded yet.
Rule: Control band match
ACCESS mode
Flight stack (FC + ESC)
✓Works with (6)
- ✓Works with (6)
The flight controller supports SBUS.
Flight controller
✓Works with (3)
- ✓Works with (3)
The flight controller supports SBUS.
Radio
×Does not work with (21)?Not enough recorded specification (16)
All radio · All 32 radio checked against this receiver
- ×Does not work with (13)
ExpressLRS cannot bind to FrSky ACCESS.
Rule: Control protocol match
- BetaFPV LiteRadio 3 ELRS 2.4 GHz
- Jumper T15 ExpressLRS
- Jumper T20S ELRS 2.4 GHz
- RadioMaster Boxer ELRS 2.4 GHz
- RadioMaster GX12 ExpressLRS
- RadioMaster Pocket ELRS 2.4 GHz
- RadioMaster T8L ELRS 2.4 GHz
- RadioMaster TX12 MKII ELRS 2.4 GHz
- RadioMaster TX15 ExpressLRS
- RadioMaster TX15 Max ExpressLRS
- RadioMaster TX16S MK3 ExpressLRS
- RadioMaster TX16S MKII Internal ELRS 2.4 GHz
Show the other 1
- ×Does not work with (4)
FrSky ACCST D16 cannot bind to FrSky ACCESS.
Rule: Control protocol match
- ×Does not work with (2)
DJI integrated control cannot bind to FrSky ACCESS.
Rule: Control protocol match
- ×Does not work with (2)
TBS Crossfire cannot bind to FrSky ACCESS.
Rule: Control protocol match
- ?Not enough recorded specification (16)
The control protocol of one of these is not recorded yet.
Rule: Control protocol match
- FLYSKY PL18 Ultra Paladin 18CH
- Flysky ProArt PA01 2.4GHz 18CH
- FrSky TWIN X Lite RII
- HelloRadioSky V12 CNCMAX 2.4GHz Dubbelfrekvens
- HelloRadioSky V14 MAX 2.4GHz Inbyggd
- HelloRadioSky V14 MAX/MAX R9 2.4GHz
- HelloradioSky V14 MAX R9 2.4GHz
- HelloRadioSky V16R Inbyggd 1W ELRS
- HelloRadioSky V16R MAX R9 Inbyggd
- iFlight Commando 14 2.4GHz/900MHz Dual-Band
- iFlight Commando 8 Pro 2.4GHz/900MHz
- Jumper T22 ELRS 2,4 GHz/915
The standards this part is judged by
What the properties above actually mean, which differences are absolute, and where the names used in shops mislead.