Protocols details

Here are detailed descriptions of every supported protocols (sorted by RF modules) as well as the available options for each protocol.

If you want to see examples of model configurations see the Models page.

The Deviation project (on which this project was based) have a useful list of models and protocols here.

Useful notes and definitions

Channel Order - The channel order assumed in all the documentation is AETR. You can change this in the compilation settings or by using a precompiled firmware. The module will take whatever input channel order you have choosen and will rearrange them to match the output channel order required by the selected protocol.
Channel ranges - A radio output of -100%..0%..+100% will match on the selected protocol -100%,0%,+100%. No convertion needs to be done.
Extended limits supported - A channel range of -125%..+125% will be transmitted. Otherwise it will be truncated to -100%..+100%.
Italic numbers are referring to protocol/sub_protocol numbers that you should use if the radio (serial mode only) is not displaying (yet) the protocol you want to access.
Autobind protocol - The transmitter will automatically initiate a bind sequence on power up or model/protocol selection. This is for models where the receiver expects to rebind every time it is powered up. In these protocols you do not need to press the bind button at power up to bind, it will be done automatically. In case a protocol is not autobind but you want to enable it, change the "Autobind" or "Bind on channel" on OpenTX setting to Y for the specific model/entry.

Bind on channel feature

Bind on channel can be globally enabled/disabled in _config.h using ENABLE_BIND_CH. Any channel between 5 and 16 can be used by configuring BIND_CH in _config.h. Default is 16.
Bind on channel can be locally enabled/disabled by setting "Bind on channel" or "Autobind" per model for serial or per dial switch number for ppm.
Once activated, any bind will only happen if all these elements are happening at the same time:
- Bind on channel = Y
- Throttle = LOW (<-95%)
- Bind channel (16 by default) is going from -100% to +100%
- It's recommended to combine the bind switch with Throttle cut or throttle at -100% to drive the bind channel. This will prevent to launch a bind while flying and enable you to use the bind switch for something else.

Protocol selection in PPM mode

The protocol selection is based on 2 parameters:

selection switch: this is the rotary switch on the module numbered from 0 to 15
- switch position 0 is to select the Serial mode for er9x/erskyTX/OpenTX radio
- switch position 15 is to select the bank
- switch position 1..14 will select the protocol 1..14 in the bank X
banks are used to increase the amount of accessible protocols by the switch. There are up to 5 banks giving acces to up to 70 protocol entries (5 * 14). To modify or verify which bank is currenlty active do the following:
- turn on the module with the switch on position 15
- the number of LED flash indicates the bank number (1 to 5 flash)
- to go to the next bank, short press the bind button, this action is confirmed by the LED staying on for 1.5 sec

Here is the full protocol selection procedure:

turn the selection switch to 15
power up the module
the module displays the current bank by flashing the LED x number of times, x being between 1 and up to 5
a short press on the bind button turns the LED on for 1 sec indicating that the system has changed the bank
repeat operation 3 and 4 until you have reached the bank you want
power off
change the rotary switch to the desired position (1..14)
power on
enjoy

Notes:

The protocol selection must be done before the module is turned on
The protocol mapping based on bank + rotary switch position can be seen/modified at the end of the file _Config.h**

Serial mode

Serial mode is selected by placing the rotary switch to position 0 before power on of the radio.

You've upgraded the module but the radio does not display the name of the protocol you are loking for:

erskyTX:
- Place the file Multi.txt (which is part of the MPM source files) on the root of your SD card.
- If the entry still does not appear or is broken, upgrade to version R222d2 or newer.
OpenTX:
- Upgrade to the latest version of OpenTX.
- If still not listed, use the Custom entry along with the protocol and sub_protocol values indicated by the italic numbers under each protocol. You'll find a summary of the protocols and numbers to use in table below.

Available Protocol Table of Contents (Listed Alphabetically)

Protocol Name	Protocol Number	Sub_Proto 0	Sub_Proto 1	Sub_Proto 2	Sub_Proto 3	Sub_Proto 4	Sub_Proto 5	Sub_Proto 6	Sub_Proto 7	RF Module	Emulation
Assan	24									NRF24L01
Bayang	14	Bayang	H8S3D	X16_AH	IRDRONE	DHD_D4	QX100			NRF24L01	XN297
Bayang RX	59	Multi	CPPM							NRF24L01	XN297
BlueFly	95									NRF24L01
Bugs	41									A7105
BugsMini	42	BUGSMINI	BUGS3H							NRF24L01	XN297
Cabell	34	Cabell_V3	C_TELEM	-	-	-	-	F_SAFE	UNBIND	NRF24L01
CFlie	38	CFlie								NRF24L01
CG023	13	CG023	YD829							NRF24L01	XN297
Corona	37	COR_V1	COR_V2	FD_V3						CC2500
CX10	12	GREEN	BLUE	DM007	-	J3015_1	J3015_2	MK33041		NRF24L01	XN297
Devo	7	Devo	8CH	10CH	12CH	6CH	7CH			CYRF6936
DM002	33									NRF24L01	XN297
DSM	6	DSM2_1F	DSM2_2F	DSMX_1F	DSMX_2F	AUTO	DSMR_1F	DSM2SFC		CYRF6936
DSM_RX	70	Multi	CPPM							CYRF6936
E010R5	81									CYRF6936	RF2500
E016H	85									NRF24L01	XN297
E016HV2	80									CC2500/NRF24L01	unknown
E01X	45	E012	E015							CYRF6936	HS6200
E129	83	E129	C186							CYRF6936	RF2500
EazyRC	61									NRF24L01	XN297L
ESky	16	ESky	ET4							NRF24L01
ESky150	35									NRF24L01
ESky150V2	69									CC2500	NRF51822
Flysky	1	Flysky	V9x9	V6x6	V912	CX20				A7105
Flysky AFHDS2A	28	PWM_IBUS	PPM_IBUS	PWM_SBUS	PPM_SBUS	PWM_IBUS16	PPM_IBUS16	PWM_SBUS16	PPM_SBUS16	A7105
Flysky AFHDS2A RX	56	Multi	CPPM							A7105
FQ777	23									NRF24L01	SSV7241
FrskyD	3	D8	Cloned							CC2500
FrskyL	67	LR12	LR12 6CH							CC2500
FrskyR9	65	FrskyR9	R9_915	R9_868						SX1276
FrskyV	25									CC2500
FrskyX	15	CH_16	CH_8	EU_16	EU_8	Cloned	Cloned_8			CC2500
FrskyX2	64	CH_16	CH_8	EU_16	EU_8	Cloned	Cloned_8			CC2500
Frsky_RX	55	Multi	CloneTX	EraseTX	CPPM					CC2500
Futaba/SFHSS	21	SFHSS								CC2500
FX	28	816	620	9630						NRF24L01
FY326	20	FY326	FY319							NRF24L01
GD00X	47	GD_V1*	GD_V2*							NRF24L01	XN297L
GW008	32									NRF24L01	XN297
H8_3D	36	H8_3D	H20H	H20Mini	H30Mini					NRF24L01	XN297
Height	53	5ch	8ch							A7105
Hisky	4	Hisky	HK310							NRF24L01
Hitec	39	OPT_FW	OPT_HUB	MINIMA						CC2500
Hontai	26	HONTAI	JJRCX1	X5C1	FQ777_951					NRF24L01	XN297
HoTT	57	Sync	No_Sync							CC2500
Hubsan	2	H107	H301	H501						A7105
J6Pro	22									CYRF6936
JJRC345	71	JJRC345	SkyTmblr							NRF24L01	XN297
JOYSWAY	84									NRF24L01	XN297
KF606	49	KF606	MIG320	ZCZ50						NRF24L01	XN297
KN	9	WLTOYS	FEILUN							NRF24L01
Kyosho	73	FHSS	Hype							A7105
Kyosho2	93	KT-17								NRF24L01
Kyosho3	98	ASF								CYRF6936
LOLI	82									NRF24L01
Losi	89									CYRF6936
MJXq	18	WLH08	X600	X800	H26D	E010*	H26WH	PHOENIX*		NRF24L01	XN297
MLINK	78									CYRF6936
MouldKg	90	Analog	Digit							NRF24L01	XN297
MT99xx	17	MT	H7	YZ	LS	FY805	A180	DRAGON	F949G	NRF24L01	XN297
MT99xx2	92	PA18								NRF24L01	XN297
NCC1701	44									NRF24L01
OMP	77									CC2500&NRF24L01	XN297L
OpenLRS	27									None
Pelikan	60	Pro	Lite	SCX24						A7105
Potensic	51	A20								NRF24L01	XN297
PROPEL	66	74-Z								NRF24L01
Q2X2	29	Q222	Q242	Q282						NRF24L01
Q303	31	Q303	CX35	CX10D	CX10WD					NRF24L01	XN297
Q90C	72	Q90C*								NRF24L01	XN297
RadioLink	74	Surface	Air	DumboRC	RC4G					CC2500
Realacc	76	R11								NRF24L01
Redpine	50	FAST	SLOW							NRF24L01	XN297
Scanner	54									CC2500
Scorpio	94									CYRF6936
SGF22	97	SGF22								NRF24L01	XN297
Shenqi	19	Shenqi								NRF24L01	LT8900
Skyartec	68									CC2500	CC2500
SLT	11	SLT_V1	SLT_V2	Q100	Q200	MR100	V1_4CH			NRF24L01	CC2500
SymaX	10	SYMAX	SYMAX5C							NRF24L01
Traxxas	43	TQ								CYRF6936
V2x2	5	V2x2	JXD506	MR101						NRF24L01
V761	48	3CH	4CH	TOPRC						NRF24L01	XN297
V911S	46	V911S*	E119*							NRF24L01	XN297
WFLY	40	WFR0x								CYRF6936
WFLY2	79	RF20x								A7105
WK2x01	30	WK2801	WK2401	W6_5_1	W6_6_1	W6_HEL	W6_HEL_I			CYRF6936
XERALL	91	Tank								NRF24L01	XN297
XK	62	X450	X420	Cars						NRF24L01	XN297
YD717	8	YD717	SKYWLKR	SYMAX4	XINXUN	NIHUI				NRF24L01
ZSX	52	280								NRF24L01	XN297

"*" Sub Protocols designated by * suffix are using a XN297L@250kbps which will be emulated by default with the NRF24L01. If option (freq tune) is diffrent from 0, the CC2500 module (if installed) will be used instead. Each specific sub protocol has a more detailed explanation.

A7105 RF Module

If USE_A7105_CH15_TUNING is enabled, the value of channel 15 is used by all A7105 protocols for tuning the frequency. This is required in rare cases where some A7105 modules and/or RXs have an inaccurate crystal oscillator.

BUGS - 41

Models: MJX Bugs 3, 6 and 8

Telemetry enabled for RX & TX RSSI, Battery voltage good/bad

RX_Num is used to give a number to a given model. You must use a different RX_Num per MJX Bugs. A maximum of 16 Bugs are supported.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	ARM	ANGLE	FLIP	PICTURE	VIDEO	LED

ANGLE: angle is +100%, acro is -100%

FLYSKY - 1

Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

RX output will match the Flysky standard AETR independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Sub_protocol Flysky - 0

Supports a variety of Flysky receivers and integrated boards.

Kyosho FHS MINI-Z also uses this protocol with this channel assignement:

CH1	CH2	CH3	CH4	CH5
Steering	Throttle	Lights	Steering travel	Others:not sure

Sub_protocol V9X9 - 1

CH5	CH6	CH7	CH8
FLIP	LIGHT	PICTURE	VIDEO

Sub_protocol V6X6 - 2

CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
FLIP	LIGHT	PICTURE	VIDEO	HEADLESS	RTH	XCAL	YCAL

Sub_protocol V912 - 3

CH5	CH6
BTMBTN	TOPBTN

Sub_protocol CX20 - 4

Model: Cheerson Cx-20

CH5	CH6	CH7

FLYSKY AFHDS2A - 28

Extended limits and failsafe supported

Telemetry enabled protocol:

by defaut using FrSky Hub protocol (for example er9x): A1=RX voltage (set the ratio to 12.7 and adjust with offset), A2=battery voltage FS-CVT01 (set the ratio to 12.7 and adjust with offset) and RX&TX RSSI
if using erskyTX and OpenTX: full telemetry information available
if telemetry is incomplete (missing RX RSSI for example), it means that you have to upgrade your RX firmware to version 1.6 or later. You can do it from an original Flysky TX or using a STLink like explained in this tutorial.

Option is used to change the servo refresh rate. A value of 0 gives 50Hz (min), 70 gives 400Hz (max). Specific refresh rate value can be calculated like this option=(refresh_rate-50)/5.

RX_Num is used to give a number a given RX. You must use a different RX_Num per RX. A maximum of 64 AFHDS2A RXs are supported.

AFHDS2A_LQI_CH is a feature which is disabled by defaut in the _config.h file. When enabled, it makes LQI (Link Quality Indicator) available on one of the RX ouput channel (5-14).

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14

RX output will match the Flysky standard AETR independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Sub_protocol PWM_IBUS - 0

Sub_protocol PPM_IBUS - 1

Sub_protocol PWM_SBUS - 2

Sub_protocol PPM_SBUS - 3

As stated above.

Sub_protocol PWM_IBUS16 - 4

Sub_protocol PPM_IBUS16 - 5

Sub_protocol PWM_SBUS16 - 6

Sub_protocol PPM_SBUS16 - 7

3 additional channels. Need recent or updated RXs.

CH15	CH16	CH17
CH15	CH16	LQI

LQI: Link Quality Indicator

FLYSKY AFHDS2A RX - 56

The Flysky AFHDS2A receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...

Available in OpenTX 2.3.3, Trainer Mode Master/Multi

Extended limits supported

Low power: enable/disable the LNA stage on the RF component to use depending on the distance with the TX.

Sub_protocol Multi - 0

Use the telemetry to send the trainer information to the radio. Available in OpenTX 2.3.3, Trainer Mode Master/Multi

Sub_protocol CPPM - 1

Sending trainer channels to FrSky radios through telemetry does not work since the telemetry lines of the internal and external modules are shared (hardware limitation). On a STM32 module and with a simple hardware modification, you can go around this limitation using CPPM to send the trainer information to the radio. For more information check the CCPM Hardware Modification page.

Once your setup is complete and before enabling the internal module, you must check the "Disable Telemetry" box to stop the Multi module from sending any data to the radio and therfore freeing up the line for the internal module.

HEIGHT - 53

Sub_protocol 5CH - 0

Models from Height, Flyzone, Rage R/C, eRC and the old ARES (prior to Hitec RED).

CH1	CH2	CH3	CH4	CH5
A	E	T	R	Gear

Sub_protocol 8CH - 1

Models from Height and Rage R/C.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	Gear	Gyro	Flap	Light

HUBSAN - 2

Telemetry enabled for A1=battery voltage (set the ratio to 12.7 and adjust with offset) and TX RSSI

Option=vTX frequency (H107D) 5645 - 5900 MHz

Sub_protocol H107 - 0

Autobind protocol

Models: Hubsan H102D, H107/L/C/D and H107P/C+/D+

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	LIGHT	PICTURE	VIDEO	HEADLESS

Sub_protocol H301 - 1

Models: Hubsan H301

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	RTH	LIGHT	STAB	VIDEO

Sub_protocol H501 - 2

Models: Hubsan H501S, H122D, H123D

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	RTH	LIGHT	PICTURE	VIDEO	HEADLESS	GPS_HOLD	ALT_HOLD	FLIP	FMODES

H122D: FLIP

H123D: FMODES -> -100%=Sport mode 1,0%=Sport mode 2,+100%=Acro

JOYSWAY - 84

CH1	CH2	CH3	CH4
CH1	CH2	CH3	CH4

Kyosho - 73

Sub_protocol FHSS - 0

Surface protocol called FHSS introduced in 2017. Transmitter: KT-531P. Models: Mini-Z.

Surface protocol called Syncro. TX: KT-331, RX: KR-331

Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14
STEERING	THROTTLE	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14

Sub_protocol Hype - 1

Transmitters: ST6DF, HK6S, Flightsport. Receivers: ST6DF, HK6DF.

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	CH5	CH6

RX output will match the Hype standard AETR independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Pelikan - 60

Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

RX output will match the Pelikan standard AETR independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Sub_protocol Pro - 0

Models: TX: CADET PRO V4, RX: RX-602 V4

Sub_protocol Lite - 1

Models: TX: CADET 4 LITE

Only 1 frequency hopping table

Sub_protocol SCX24 - 2

TX: Axial AX-4 2.4GHz transmitter, HPI TF-41 and Panda Hobby 3CH Smart Radio 2.4GHz (MT-305A)

Models: Axial SCX24: Deadbolt, Jeep Wranger Rubicon, Chevrolet 1967 C10, B-17 Betty, HPI RF-50 and Panda Hobby: Tetra K1, X1, X2

Extended limits supported

CH1	CH2	CH3
STEERING	THROTTLE	CH3

WFLY2 - 79

Receivers: RF201S,RF206S,RF207S,RF209S

Extended limits supported

Failsafe fully supported (value, hold and no pulse).

Telemetry enabled for A1=RX_Batt (Ratio 12.7), A2=Ext_Batt (Ratio 12.7), RX RSSI, TX RSSI, TX LQI (100=all telem packets received...0=no telem packets).

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10

Option is used to select between WBUS=0 and PPM=1

CYRF6936 RF Module

If USE_CYRF6936_CH15_TUNING is enabled, the value of channel 15 is used by all CYRF6936 protocols for tuning the frequency. This is required in rare cases where some CYRF6936 modules and/or RXs have an inaccurate crystal oscillator.

DEVO - 7

Extended limits and failsafe supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12

RX output will match the Devo standard EATR independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Full telemetry is available if the RX supports it: TX_RSSI, A1 (set the ratio to 12.7) and A2 (set the ratio to 12.7), VFAS, RPM, temperature 1&2, GPS position/speed/altitude/time. The GPS coordinates come in two flavors which can't be distinguished programmatically, to switch from one to the other add 2 to the Option/FixedID setting value (0->2, 1->3).

Bind procedure using serial:

With the TX off, put the binding plug in and power on the RX (RX LED slow blink), then power it down and remove the binding plug. Receiver should now be in autobind mode.
Turn on the TX, set protocol = Devo with Option/FixedID=0, turn off the TX (TX is now in autobind mode).
Turn on RX (RX LED fast blink).
Turn on TX (RX LED solid, TX LED fast blink).
Wait for bind on the TX to complete (TX LED solid).
Make sure to set a uniq RX_Num value for model match.
Change Option/FixedID to 1 to use the global ID.
Do not touch Option/FixedID and RX_Num anymore.
Note: it might be limited to only the RX705 but to get telemetry, the Option/FixedID field has to be set back to 0 at then end of the procedure...

Bind procedure using PPM:

With the TX off, put the binding plug in and power on the RX (RX LED slow blink), then power it down and remove the binding plug. Receiver should now be in autobind mode.
Turn on RX (RX LED fast blink).
Turn the dial to the model number running protocol DEVO on the module.
Press the bind button and turn on the TX. TX is now in autobind mode.
Release bind button after 1 second: RX LED solid, TX LED fast blink.
Wait for bind on the TX to complete (TX LED solid).
Press the bind button for 1 second. TX/RX is now in fixed ID mode.
To verify that the TX is in fixed mode: power cycle the TX, the module LED should be solid ON (no blink).
Note: Autobind/fixed ID mode is linked to the RX_Num number. Which means that you can have multiple dial numbers set to the same protocol DEVO with different RX_Num and have different bind modes at the same time. It enables PPM users to get model match under DEVO.

Sub_protocol 8CH - 0

Sub_protocol 10CH - 1

Sub_protocol 12CH - 2

Sub_protocol 6CH - 3

Sub_protocol 7CH - 4

WK2X01 - 30

Extended limits supported Autobind protocol

Note: RX ouput will always be AETR independently of the input AETR, RETA...

Sub_protocol WK2801 - 0

Failsafe supported.

This roughly corresponds to the number of channels supported, but many of the newer 6-channel receivers actually support the WK2801 protocol. It is recommended to try the WK2801 protocol 1st when working with older Walkera models before attempting the WK2601 or WK2401 mode, as the WK2801 is a superior protocol. The WK2801 protocol supports up to 8 channels.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

Bind procedure using serial:

With the TX off, put the binding plug in and power on the RX (RX LED slow blink), then power it down and remove the binding plug. Receiver should now be in autobind mode.
Turn on the TX, set protocol = WK2X01, sub_protocol = WK2801 with option=0, turn off the TX (TX is now in autobind mode).
Turn on RX (RX LED fast blink).
Turn on TX (RX LED solid, TX LED fast blink).
Wait for bind on the TX to complete (TX LED solid).
Make sure to set a uniq RX_Num value for model match.
Change option to 1 to use the global ID.
Do not touch option/RX_Num anymore.

Bind procedure using PPM:

With the TX off, put the binding plug in and power on the RX (RX LED slow blink), then power it down and remove the binding plug. Receiver should now be in autobind mode.
Turn on RX (RX LED fast blink).
Turn the dial to the model number running protocol protocol WK2X01 and sub_protocol WK2801 on the module.
Press the bind button and turn on the TX. TX is now in autobind mode.
Release bind button after 1 second: RX LED solid, TX LED fast blink.
Wait for bind on the TX to complete (TX LED solid).
Press the bind button for 1 second. TX/RX is now in fixed ID mode.
To verify that the TX is in fixed mode: power cycle the TX, the module LED should be solid ON (no blink).
Note: Autobind/fixed ID mode is linked to the RX_Num number. Which means that you can have multiple dial numbers set to the same protocol DEVO with different RX_Num and have different bind modes at the same time. It enables PPM users to get model match under DEVO.

Sub_protocol WK2401 - 1

The WK2401 protocol is used to control older Walkera models.

CH1	CH2	CH3	CH4
A	E	T	R

Sub_protocol W6_5_1 - 2

WK2601 5+1: AIL, ELE, THR, RUD, GYRO (ch 7) are proportional. Gear (ch 5) is binary. Ch 6 is disabled

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	GEAR	DIS	GYRO

Sub_protocol W6_6_1 - 3

WK2601 6+1: AIL, ELE, THR, RUD, COL (ch 6), GYRO (ch 7) are proportional. Gear (ch 5) is binary. This mode is highly experimental.

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	GEAR	COL	GYRO

Sub_protocol W6_HEL - 4 and W6HEL_I - 5

WK2601 Heli: AIL, ELE, THR, RUD, GYRO are proportional. Gear (ch 5) is binary. COL (ch 6) is linked to Thr. If Ch6 >= 0, the receiver will apply a 3D curve to the Thr. If Ch6 < 0, the receiver will apply normal curves to the Thr. The value of Ch6 defines the ratio of COL to THR.

W6HEL_I: Invert COL servo

option= maximum range of COL servo

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	GEAR	COL	GYRO

DSM - 6

Extended limits supported

Telemetry enabled for TSSI and plugins

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	----	CH14
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	----	TH_KILL

Notes:

The "AUTO" sub protocol is recommended to automatically select the best settings for your DSM RX. If the RX doesn't bind or work properly after bind, don't hesitate to test different combinations of sub protocol and number of channels until you have something working.
Servo refresh rate is 22ms unless you select 11ms available in OpenTX 2.3.10+
RX output will match the Spektrum standard TAER independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.
RX output will match the Spektrum standard throw (1500µs +/- 400µs -> 1100..1900µs) for a 100% input. This is true for both Serial and PPM input. For PPM, make sure the end points PPM_MIN_100 and PPM_MAX_100 in _config.h are matching your TX ouput. The maximum ouput is 1000..2000µs based on an input of 125%.
- If you want to override the above and get maximum throw either uncomment in _config.h the line #define DSM_MAX_THROW or on OpenTX 2.3.3+ use the "Enable max throw" feature on the GUI (0=No,1=Yes). In this mode to achieve standard throw use a channel weight of 84%.
TH_KILL is a feature which is enabled on channel 14 by default (can be disabled/changed) in the _config.h file. Some models (X-Vert, Blade 230S...) require a special position to instant stop the motor(s). If the channel 14 is above -50% the throttle is untouched but if it is between -50% and -100%, the throttle output will be forced between -100% and -150%. For example, a value of -80% applied on channel 14 will instantly kill the motors on the X-Vert.
To allow SAFE to be ON with a switch assignment you must remove the bind plug after powering up the RX but before turning on the TX to bind. If you select Autodetect to bind, The MPM will choose DSMX 11ms and Channels 1-7 ( Change to 1-9 if you wish to assign switch above channel 7 ). Then in order to use the manuals diagram of both sticks "Down-Inside" to set a SAFE Select Switch Designation, you must have Throttle and Elevator channels set to Normal direction but the Aileron and Rudder set to Reverse direction. If setting up a new model with all channels set to Normal you can hold both sticks "Down- OUTSIDE" to assign the switch with 5x flips. Tested on a Mode2 radio.

Option=number of channels from 3 to 12. Option|0x80 enables Max Throw. Option|0x40 enables a servo refresh rate of 11ms.

Here is a table detailling the different RX output ranges based on the radio settings:

Sub_protocol DSM2_1F - 0

Air DSM2, Resolution 1024, servo refresh rate can only be 22ms

Sub_protocol DSM2_2F - 1

Air DSM2, Resolution 2048, servo refresh rate can be 22 or 11ms. 11ms won't be available on all servo outputs when more than 7 channels are used.

Sub_protocol DSMX_1F - 2

Air DSMX, Resolution 2048, servo refresh rate can only be 22ms

Sub_protocol DSMX_2F - 3

Air DSMX, Resolution 2048, servo refresh rate can be 22 or 11ms. 11ms won't be available on all servo outputs when more than 7 channels are used.

Sub_protocol AUTO - 4

"AUTO" is recommended to automatically select the best settings for your air DSM2 and DSMX RXs.

Sub_protocol DSMR_1F - 5

Surface DSMR receivers

Only 22 IDs available, use RX num to cycle through them.

Telemetry enabled, extended limits available and no channel mapping. Do not use DSM/AUTO to bind but DSM/R_1F instead.

CH1	CH2	CH3	CH4	CH5	CH6	CH7
STR	THR	AUX1	AUX2	AUX3	AUX4	AUX5

Sub_protocol DSM2SFC - 6

Surface DSM2 receivers, tested with a SR3100

Extended limits available and no channel mapping. Do not use DSM/AUTO to bind but DSM/2SFC instead.

Servo refresh rate 22/11ms is repurposed to the frame rates 16.5ms(22) and 11ms(11).

CH1	CH2	CH3
STR	THR	AUX1

DSM_RX - 70

The DSM receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...

Notes:

Automatically detect DSM 2/X 11/22ms 1024/2048res
Bind should be done with all other modules off in the radio
Available in OpenTX 2.3.3+, Trainer Mode Master/Multi
Channels 1..4 are remapped to the module default channel order unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.
Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12

Sub_protocol Multi - 0

Use the telemetry to send the trainer information to the radio.

Sub_protocol CPPM - 1

Sending trainer channels to FrSky radios through telemetry does not work since the telemetry lines of the internal and external modules are shared (hardware limitation). On a STM32 module and with a simple hardware modification, you can go around this limitation using CPPM to send the trainer information to the radio. For more information check the CCPM Hardware Modification page.

Once your setup is complete and before enabling the internal module, you must check the "Disable Telemetry" box to stop the Multi module from sending any data to the radio and therfore freeing up the line for the internal module.

E010R5 - 81

Models: E010 R5 red boards, JJRC H36, H36F and H36S

Not supported by Atmega328p modules.

Autobind protocol.

Only 5 IDs are available. Use RX num to cycle through them. More IDs can be added if you send me your "unused" original TX.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	FLIP	LED	CALIB	HEADLESS	RTH	GLIDE

E01X - 45

Autobind protocol

Not supported by Atmega328p modules.

Sub_protocol E012 - 0

Models: Eachine E012

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R		FLIP		HEADLESS	RTH

Sub_protocol E015 - 1

Models: Eachine E015

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	ARM	FLIP	LED	HEADLESS	RTH

E129 - 83

Not supported by Atmega328p modules.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	Take off/Land	Emergency	Trim A	Trim E	Trim R

Trims can be done to some extent on the AETR channels directly but if you push them too far you won't be able to arm like explained below. In this case use the associated trim TrimA/E/R instead.

Take off with a none spring throttle is easier by putting both sticks down outwards (like on the original radio) in Mode 1/2, not sure about other modes.

Calib is the same as the original radio with both sticks down and to the left in Mode 1/2, not sure about other modes.

Sub_protocol E129 - 0

Models: Eachine E129/E130 and Twister Ninja 250

Sub_protocol C186 - 1

Models: RC ERA C186/E120, C127/E110, K127, C159, C189, C129v2

The FC of the heli seems to store the trims Trim A/E/R=CH7..9. If you use these trims, make sure to center them after powering off the heli or they will be added to the previous trims and over correct.

CH10	CH11
Loop	Flip

Loop: circular flight on the C159 (others?)

Flip: flip/aerobatic on the C129v2 (others?)

J6Pro - 22

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12

Kyosho3 - 98

Sub_protocol ASF - 0

Surface protocol ASF. Models: Mini-Z.

Extended limits supported

CH1	CH2	CH3	CH4
STEERING	THROTTLE	CH3	CH4

Losi - 89

TX: LSR-3000

Extended limits supported

CH1	CH2	CH3
ST	THR	CH3

MLINK - 78

Extended limits supported

Bind: the RX must be really close to the TX

Failsafe MUST be configured once with the desired channel values (hold or no pulses are not supported) while the RX is up (wait 10+sec for the RX to learn the config) and then failsafe MUST be set to RX/Receiver otherwise the servos will jitter!!!

Telemetry: the 2 RXs I have are sending different information in different format

RX-5: RX_RSSI=RSSI=sort of RSSI or link quality, RX_LQI=number of connection lost, TX_RSSI=RSSI from the TX perspective, TX_LQI=percentage of received telemetry packets
RX-9-DR: A1=RX Batt (Ratio=12.7), RX_RSSI=TX_LQI=percentage of received telemetry packets from the TX perspective not RX, TX_RSSI=RSSI from the TX perspective, TX_LQI=percentage of received telemetry packets

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Scorpio - 94

Model Scorpio Falco 300, TX:Nine Eagles 4CH-TX, RX:Nine Eagles 4CH-RX

CH1	CH2	CH3	CH4
A	E	T	R

Traxxas - 43

Transmitter TQ, Receivers: 6519, 2218(X), ECM-2.5

Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6
CH1	CH2	CH3	CH4	CH5	CH6

Warning from v1.3.4.7 channels order have changed

WFLY - 40

Receivers: WFR04S, WFR07S, WFR09S

Extended limits supported

Failsafe values supported (not hold or none)

Option=number of channels from 4 to 9. An invalid option value will end up sending 9 channels.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9

CC2500 RF Module

CORONA - 37

Models: Corona 2.4GHz FSS and DSSS receivers.

Extended limits supported

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol COR_V1 - 0

Corona FSS V1 RXs

Sub_protocol COR_V2 - 1

Corona DSSS V2 RXs: CR8D, CR6D and CR4D

To bind V2 RXs you must follow the below procedure (original):

press the bind button and power on the RX
launch a bind from Multi -> the RX will blink 2 times
turn off the RX and TX(=Multi)
turn on the RX first
turn on the TX(=Multi) second
wait for the bind to complete -> the RX will flash, stop and finally fix
wait some time (more than 30 sec) before turning off the RX
turn off/on the RX and test that it can reconnect instantly, if not repeat the bind procedure

Sub_protocol FD_V3 - 2

FlyDream RXs like IS-4R and IS-4R0

E016HV2 - 80

Models: E016H v2

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable or bind won't even work. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	TAKE_OFF/LANDING	EMERGENCY	FLIP	CALIB	HEADLESS	RTH

TAKE_OFF/LANDING: this is a momentary switch to arm the motors or land the quad. This switch is not really needed as you can start the quad with throttle low then increase throttle until the motor arms, move throttle to mid-stick and then increase it quickly to lift off; To land just bring throttle all the way down, the quad will just stops when touching the ground.

EMERGENCY: Can be used along with the throttle cut switch: Throttle cut=set throttle at -100% and set EMERGENCY to 100%

ESKY150V2 - 69

ESky protocol for small models: 150 V2, F150 V2, Blade 70s

Notes:

RX output will match the eSky standard TAER independently of the input configuration AETR, RETA... unless on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.
To run this protocol you need both CC2500 and NRF24L01 to be enabled for code reasons, only the CC2500 is really used.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
A	E	T	R	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

RATE for the F150 V2 is assigned to channel 5: -100%=low, 100%=high

FRSKYV - 25

Models: FrSky receivers V8R4, V8R7 and V8FR.

FrSkyV = FrSky 1 way

Extended limits supported

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4
CH1	CH2	CH3	CH4

FRSKYD - 3

Models: FrSky receivers D4R and D8R. DIY RX-F801 and RX-F802 receivers. Also known as D8.

Extended limits supported

Telemetry enabled for A0, A1, RSSI, TX_RSSI, TX_LQI and Hub. Lowest the TX_LQI value is best the quality link is, it's a good indicator of how well the module is tuned.

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol D8 - 0

Use the internal multi module Identifier.

Sub_protocol Cloned - 1

Use the identifier learnt from another FrSky radio when binding with the FrSkyRX/CloneTX mode.

RX number can't be used anymore and is ignored.

FRSKYL - 67

Models: FrSky receivers L9R. Also known as LR12.

Extended limits supported

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

Sub_protocol LR12 - 0

Refresh rate: 36ms

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12

Sub_protocol LR12 6ch - 1

Refresh rate: 18ms

CH1	CH2	CH3	CH4	CH5	CH6
CH1	CH2	CH3	CH4	CH5	CH6

FRSKYX - 15

Models: FrSky v1.xxx receivers X4R, X6R and X8R. Protocol also known as D16 v1 FCC/LBT.

Extended limits and failsafe supported

Telemetry enabled for A1 (RxBatt), A2, RSSI, TX_RSSI, TX_LQI and Hub. Lowest the TX_LQI value is best the quality link is, it's a good indicator of how well the module is tuned.

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

Sub_protocol CH_16 - 0

FCC protocol 16 channels @18ms.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol CH_8 - 1

FCC protocol 8 channels @9ms.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol EU_16 - 2

EU-LBT protocol 16 channels @18ms.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol EU_8 - 3

EU-LBT protocol 8 channels @9ms.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol Cloned - 4

Use the identifier learnt from another FrSky radio when binding with the FrSkyRX/CloneTX mode.

16 channels.

Sub_protocol Cloned_8 - 5

Use the identifier learnt from another FrSky radio when binding with the FrSkyRX/CloneTX mode.

8 channels.

FRSKYX2 - 64

Same as FrskyX but for D16 v2.1.0 FCC/LBT.

FRSKY_RX - 55

Sub_protocol Multi - 0

The FrSky receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...

Auto detection of the protocol used by a TX transmitting FrSkyD/D8, FrSkyX/D16 v1.xxx FCC/LBT or FrSkyX/D16 v2.1.0 FCC/LBT at bind time.

Available in OpenTX 2.3.3, Trainer Mode Master/Multi

Extended limits supported

For FrSkyX, RX num must match on the master and slave. This enables a multi student configuration for example.

Option for this protocol corresponds to fine frequency tuning. If the value is equal to 0, the RX will auto tune otherwise it will use the indicated value. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

Low power: enable/disable the LNA stage on the RF component to use depending on the distance with the TX.

Sub_protocol CPPM - 3

Sending trainer channels to FrSky radios through telemetry does not work since the telemetry lines of the internal and external modules are shared (hardware limitation). On a STM32 module and with a simple hardware modification, you can go around this limitation using CPPM to send the trainer information to the radio. For more information check the CCPM Hardware Modification page.

Once your setup is complete and before enabling the internal module, you must check the "Disable Telemetry" box to stop the Multi module from sending any data to the radio and therfore freeing up the line for the internal module.

Sub_protocol CloneTX - 1

This subprotocol makes a clone of a TX identifier transmitting FrSkyD/D8, FrSkyX/D16 v1.xxx FCC/LBT and FrSkyX/D16 v2.1.0 FCC/LBT.

There are 3 slots available, 1 slot for D8 cloning, 1 slot for FrSkyX (D16v1) cloning and 1 slot for FrSkyX2 (D16v2.1.0) cloning. The same TX or different TXs can be used for each slot but a maximum of 1 per slot. If you launch the FrSky_RX/CloneTX protocol and do a bind with a TX transmitting with the D8 protocol, it will be saved in the slot D8. Same for D16v1 and D16v2.1 . Then the system will alow you to enable cloning as you wish for each model using the FrSkyD/X/X2 "Cloned" subprotocol. This way you can have models working with the original MPM indentifier and models which are shared by both the cloned TX and MPM.

Clone mode operation:

Select the FrSky_RX protocol, subprotocol CloneTX
Select on the TX to be cloned the protocol you want to clone the identifier from: FrSkyD/D8 or FrSkyX/D16 v1.xxx FCC/LBT or FrSkyX/D16 v2.1.0 FCC/LBT
Place both the TX and MPM in bind mode
Wait for the bind to complete
To use the cloned TX identifier, open a new model select the protocol you just cloned/binded and select the subprotocol "Cloned"

Notes:

OpenTX 2.3.8 N184 (nightly) or later is needed to have access to the "D8Cloned" and "D16Cloned" subprotocols, D16v2.1 "Cloned" is available under FrSkyX2/Cloned.
For FrSkyD, only the RX number used during bind is cloned -> you can't use RX num anymore
For FrSkyX and FrSkyX2, RX number has to be adjusted on each model to match the original TX model

Sub_protocol EraseTX - 2

This subprotocol erases ALL the clone IDs which have been recorded.

To erase ALL the clone information, select the sub_protocol EraseTX and execute a bind.

HITEC - 39

Models: OPTIMA, MINIMA and MICRO receivers.

Extended limits supported

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9

Sub_protocol OPT_FW - 0

OPTIMA RXs

Full telemetry available on OpenTX 2.3.3+, still in progress for erskyTx. Lowest the TX_LQI value is best the quality link is, it's a good indicator of how well the module is tuned.

The TX must be close to the RX for the bind negotiation to complete successfully

Sub_protocol OPT_HUB - 1

OPTIMA RXs

Basic telemetry using FrSky Hub on er9x, erskyTX, OpenTX and any radio with FrSky telemetry support with RX voltage, VOLT2 voltage, TX_RSSI and TX_LQI. Lowest the TX_LQI value is best the quality link is, it's a good indicator of how well the module is tuned.

The TX must be close to the RX for the bind negotiation to complete successfully

Sub_protocol MINIMA - 2

MINIMA, MICRO and RED receivers. Also used by ARES planes.

HoTT - 57

Models: Graupner HoTT receivers (tested on GR-12, GR-12L, GR-16, GR-32 and Vector).

Extended limits, failsafe and LBT supported.

Full telemetry and full text config mode are available starting from OpenTX 2.3.8N226.

RX_Num is used to give a number to a given RX. You must use a different RX_Num per RX. A maximum of 64 HoTT RXs are supported.

Failsafe MUST be configured once with the desired channel values (hold or position) while the RX is up (wait 10+sec for the RX to learn the config) and then failsafe MUST be set to RX/Receiver otherwise the servos will jitter!!!

The RX and sensors/FC features configuration are done through the OpenTX script "Graupner HoTT.lua".

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol Sync - 0

Recommended for best telemetry performance.

Sub_protocol No_Sync - 1

Telemetry compatibility mode when Sync does not work due to an old firmware on the RX. You should definitively upgrade your receivers/sensors to the latest firmware versions: https://www.rcgroups.com/forums/showpost.php?p=44668015&postcount=18022

Scanner - 54

2.4GHz scanner accessible using the OpenTX 2.3 Spectrum Analyser tool.

RadioLink - 74

Extended limits

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	FS_CH1	FS_CH2	FS_CH3	FS_CH4	FS_CH5	FS_CH6	FS_CH7	FS_CH8

FS=FailSafe

Sub_protocol Surface - 0

Surface protocol. TXs: RC4GS,RC6GS. Compatible RXs: R7FG(Std),R6FG,R6F,R8EF,R8FM,R8F,R4FGM,R4F

CH1=Steering, CH2=Throttle, CH8=Gyro gain

Telemetry: RX_RSSI (for the original value add -256), TX_RSSI, TX_QLY (0..100%), A1=RX_Batt (set the ratio to 12.7 and adjust with offset), A2=Batt (set the ratio to 25.5 and adjust with offset)

Sub_protocol Air - 1

Air protocol. TXs: T8FB,T8S. Compatible RXs: R8EF,R8FM,R8SM,R4FG,R4F

Telemetry: RX_RSSI (for the original value add -256), TX_RSSI, TX_QLY (0..100%)

Sub_protocol DumboRC - 2

Compatible RXs: X6/X6F/X6FG

Sub_protocol RC4G - 3

Compatible RXs: R4EH-G(/R4EH-H)

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
CH1	CH2	CH3	CH4	CH5	FS_CH1	FS_CH2	FS_CH3	FS_CH4

FS=FailSafe

CH5 is driven by CH3 on the original TX, gyro sensitivity?

Futaba - 21

Also called SFHSS depending on radio version.

Sub_protocol SFHSS - 0

Models: Futaba SFHSS RXs and some XK models.

Extended limits and failsafe supported.

RX output will match the Futaba standard servo throw, mid point and the channel order AETR independently of the input configuration AETR, RETA... unless if on OpenTX 2.3.3+ you use the "Disable channel mapping" feature on the GUI.

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

This protocol does not use bind on the TX side. The RX attaches to the first S-FHHSS TX around it when the bind button is pressed.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

Skyartec - 68

Option for this protocol corresponds to fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	CH5	CH6	CH7

CC2500 and/or NRF24L01 RF Module(s)

If a CC2500 is installed it will be used for all the below protocols. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then these protocols might be problematic because they are using the XN297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

BLUEFLY - 95

Model: HP100

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

TRIM: either use this channel for trim only or add a mixer with aileron to increase the roll rate.

RATE: -100% high rate, +100% low rate

GD00X - 47

Model: GD005 C-17 Transport, GD006 DA62 and ZC-Z50

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A		T		TRIM	LED	RATE

TRIM: either use this channel for trim only or add a mixer with aileron to increase the roll rate.

RATE: -100% high rate, +100% low rate

Sub_protocol GD_V1 - 0

First generation of GD models, ZC-Z50

Sub_protocol GD_V2 - 1

New generation of GD models

KF606 - 49

Sub_protocol KF606 - 0

Model: KF606

CH1	CH2	CH3	CH4	CH5
A		T		TRIM

Sub_protocol MIG320 - 1

Model: Zhiyang MIG-320

CH1	CH2	CH3	CH4	CH5	CH6
A		T		TRIM	LED

Sub_protocol ZCZ50v2 - 2

Model: ZC-Z50 Cessna

This might be newer version of the model. My plane does not have front propeller, but its just fake anyway (no motor in the front).

CH1	CH2	CH3	CH4	CH5	CH6
A		T		TRIM	UNKNOWN

MJXQ - 18

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14
A	E	T	R	FLIP	LED	PICTURE	VIDEO	HEADLESS	RTH	AUTOFLIP	PAN	TILT	RATE

RATE: -100%(default)=>higher rates by enabling dynamic trims (except for Headless), 100%=>disable dynamic trims

CC2500: only E010 and PHOENIX are supported.

Sub_protocol WLH08 - 0

Sub_protocol X600 - 1

Only 3 TX IDs available, change RX_Num value 0..2 to cycle through them

Sub_protocol X800 - 2

Only 3 TX IDs available, change RX_Num value 0..2 to cycle through them

Sub_protocol H26D - 3

Only 3 TX IDs available, change RX_Num value 0..2 to cycle through them

Sub_protocol E010 - 4

15 TX IDs available, change RX_Num value 0..14 to cycle through them

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

Sub_protocol H26WH - 5

CH6
ARM

Only 1 TX ID available

Sub_protocol PHOENIX - 6

CH6
ARM

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

MT99XX - 17

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	LED	PICTURE	VIDEO	HEADLESS

CC2500: only YZ is supported.

Sub_protocol MT99 - 0

Models: MT99xx

Sub_protocol H7 - 1

Models: Eachine H7, Cheerson CX023

Sub_protocol YZ - 2

Model: Yi Zhan i6S

Only one model can be flown at the same time since the ID is hardcoded.

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

Sub_protocol LS - 3

Models: LS114, 124, 215

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	INVERT	PICTURE	VIDEO	HEADLESS

Sub_protocol FY805 - 4

Model: FY805

Only 1 ID available

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP				HEADLESS

Sub_protocol A180 - 5

Model: XK A180, A120, F949S, F959

A180:

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	3D6G	RATE

A120:

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	RATE	LED

F949S:

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	RATE	RXLED	3D6G

Sub_protocol DRAGON - 6

Model: Eachine Mini Wing Dragon, Eachine Mini Cessna

Telemetry is supported: A1 = battery voltage with a Ratio of 25.5, A2=battery low flag (0=off,>0=on) and RSSI = dummy value of 100

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	MODE	RTH

MODE: -100%=Beginner, 0%=Intermediate, +100%=Advanced

Sub_protocol F949G - 7

Model: F949G

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	6G3D	Light

Model: KFPLAN Z61 BF109

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	-	Rate	Light	Unk1	Unk2

Unk1&2: long press right/left

MT99XX2 - 92

Sub_protocol PA18 - 92

Model: PA18 mini

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	MODE	FLIP	RTH

MODE: -100% beginner, 0% intermediate, +100% Expert

OMP - 77

Model: OMPHOBBY M1 & M2 Helis, T720 RC Glider

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

Telemetry is supported:

A1 = battery voltage including "recovered" battery voltage from corrupted telemetry packets
A2 = battery voltage from only good telemetry packets
How to calculate accurately the OpenTX Ratio and Offset: Set the Ratio to 12.7 and Offset to 0, plug 2 batteries with extreme voltage values, write down the values Batt1=12.5V & Telem1=12.2V, Batt2=7V & Telem2=6.6V then calculate/set Ratio=12.7*[(12.5-7)/(12.2-6.6)]=12.47 => 12.5 and Offset=12.5-12.2*[(12.5-7)/(12.2-6.6)]=0.517 => 0.5
RX_RSSI = TQly = percentage of received telemetry packets (good and corrupted) from the model which has nothing to do with how well the RX is receiving the TX

Option for this protocol corresponds to the CC2500 fine frequency tuning. This value is different for each Module and must be accurate otherwise the link will not be stable. Check the Frequency Tuning page to determine it.

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T_PITCH	R	T_HOLD	IDLE	MODE

IDLE= 3 pos switch: -100% Normal, 0% Idle1, +100% Idle2

From the TX manual: MODE= 3 pos switch -100% Attitude, 0% Attitude(?), +100% 3D For M2: MODE= 3 pos switch -100% 6G, 0% 3D, +100% 3D

Q303 - 31

Autobind protocol

CH1	CH2	CH3	CH4
A	E	T	R

CC2500: only Q303 is supported.

Sub_protocol Q303 - 0

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

CH5	CH6	CH7	CH8	CH9	CH10	CH11
AHOLD	FLIP	PICTURE	VIDEO	HEADLESS	RTH	GIMBAL

GIMBAL needs 3 position -100%/0%/100%

Sub_protocol CX35 - 1

CH5	CH6	CH7	CH8	CH9	CH10	CH11
ARM	VTX	PICTURE	VIDEO		RTH	GIMBAL

ARM is 2 positions: land / take off

Each toggle of VTX will increment the channel.

Gimbal is full range.

Sub_protocol CX10D - 2

Models CX10D and CX33W

CH5	CH6
ARM	FLIP

ARM is 3 positions: -100%=land / 0%=manual / +100%=take off

Sub_protocol CX10WD - 3

CH5	CH6
ARM	FLIP

ARM is 3 positions: -100%=land / 0%=manual / +100%=take off

Q90C - 72

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	FMODE	VTX+

FMODE: -100% angle, 0% horizon, +100% acro VTX+: -100%->+100% channel+

SLT - 11

Autobind protocol

Sub_protocol V1 - 0

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	GEAR	PITCH

Sub_protocol V2 - 1

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	CH5	CH6	CH7	CH8

Sub_protocol Q100 - 2

Models: Dromida Ominus UAV

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	RATES	-	CH7	CH8	MODE	FLIP	-	-	CALIB

RATES takes any value between -50..+50%: -50%=min rates, 0%=mid rates (stock setting), +50%=max rates

CH7 and CH8 have no visible effect

MODE: -100% level, +100% acro

FLIP: sets model into flip mode for approx 5 seconds at each throw of switch (rear red LED goes out while active) -100%..+100% or +100%..-100%

CALIB: -100% normal mode, +100% gyro calibration

Sub_protocol Q200 - 3

Model: Dromida Ominus Quadcopter FPV, the Nine Eagles - FENG FPV and may be others

Dromida Ominus FPV channels mapping:

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	RATES	-	CH7	CH8	MODE	FLIP	VID_ON	VID_OFF	CALIB

FENG FPV: channels mapping:

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	RATES	-	CH7	CH8	FLIP	MODE	VID_ON	VID_OFF	CALIB

RATES takes any value between -50..+50%: -50%=min rates, 0%=mid rates (stock setting), +50%=max rates

CH7 and CH8 have no visible effect

MODE: -100% level, +100% acro

FLIP: sets model into flip mode for approx 5 seconds at each throw of switch (rear red LED goes out while active) -100%..+100% or +100%..-100%

CALIB: -100% normal mode, +100% gyro calibration

Sub_protocol MR100 - 4

Models: Vista UAV, FPV, FPV v2

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	RATES	-	CH7	CH8	MODE	FLIP	VIDEO	PICTURE

RATES takes any value between -50..+50%: -50%=min rates, 0%=mid rates (stock setting), +50%=max rates

CH7 and CH8 have no visible effect

FLIP: sets model into flip mode for approx 5 seconds at each throw of switch (rear red LED goes out while active) -100%..+100% or +100%..-100%

MODE: -100% level, +100% acro

Sub_protocol V1_4CH - 5

CH1	CH2	CH3	CH4
CH1	CH2	CH3	CH4

V911S - 46

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	CALIB	RATE

Rate: -100% High, +100% Low

Sub_protocol V911S - 0

Models: WLtoys V911S, XK A110

Sub_protocol E119 - 1

Models: Eachine E119, JJRC W01-J3, XK A220 P-40, XK A800 R2, F959S R2, A160 R2, A280

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	CALIB	RATE	6G_3D	6GSENIOR	LIGHT

A280 -> 6GSENIOR: -100% - 6G, +100% - Senior mode (turn off gyro), LIGHT: cycle the light through on-flash-off when the CH9 value is changed from -100% to 100%

XK - 62

CC2500: only X450 is supported.

Sub_protocol X450 - 0

Models: XK X450 (TX=X8)

If a CC2500 is installed it will be used for this sub protocol. Option in this case is used for fine frequency tuning like any CC2500 protocols so check the Frequency Tuning page.

If only a NRF24L01 is installed then this sub protocol might be problematic because it is using the xn297L emulation with a transmission speed of 250kbps which doesn't work very well with every NRF24L01, this is an hardware issue with the authenticity and accuracy of the components.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	Flight_modes	Take_off	Emerg stop	3D/6G	Picture	Video

Flight_modes: -100%=M-Mode, 0%=6G-Mode, +100%=V-Mode. CH6-CH10 are mementary switches.

Sub_protocol X420 - 1

Models: XK X420/X520 (TX=X4)

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	Flight_modes	Take_off	Emerg stop	3D/6G	Picture	Video

Flight_modes: -100%=M-Mode, 0%=6G-Mode, +100%=V-Mode. CH6-CH10 are mementary switches.

Model: Tiger Drone 1400782

CH1	CH2	CH3	CH4	CH11	CH12
A	E	T	R	FLIP	LIGHT

Sub_protocol Cars - 2

Models: WLtoys cars 284131/284161/284010/124016/124017/144010 and Eachine EAT14

NRF24L01 RF Module

ASSAN - 24

Extended limits supported

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

The transmitter must be close to the receiver while binding.

BAYANG - 14

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	-	-	CH14	CH15
A	E	T	R	FLIP	RTH	PICTURE	VIDEO	HEADLESS	INVERTED	RATES	-	-	ANAAUX1	ANAAUX2

RATES: -100%(default)=>higher rates by enabling dynamic trims (except for Headless), 100%=>disable dynamic trims

Channels 14 and 15 (ANAAUX1 and ANAAUX2) only available with analog aux channel option, indicated below.

Sub_protocol BAYANG - 0

Models: Eachine H8(C) mini, BayangToys X6/X7/X9, JJRC JJ850, Floureon H101 ...

Option=0 or Telemetry = Off -> normal Bayang protocol

Option=1 or Telemetry = On -> enable telemetry with Silverxxx firmware. Value returned to the TX using FrSkyD Hub are RX RSSI, TX RSSI, A1=uncompensated battery voltage (set the ratio to 5.0 and adjust with offset), A2=compensated battery voltage (set the ratio to 5.0 and adjust with offset) and if supported AccX=P, AccY=I, ACCZ=D (which you can rename after the sensors discovery)

Option=2 or Telemetry = Off+AUX -> enable analog aux channels with NFE Silverware firmware. Two otherwise static bytes in the protocol overridden to add two 'analog' (non-binary) auxiliary channels.

Option=3 or Telemetry = On+AUX-> both Silverware telemetry and analog aux channels enabled.

Sub_protocol H8S3D - 1

Model: H8S 3D

Same channels assignment as above.

Sub_protocol X16_AH - 2

Model: X16 AH

CH12
TAKE_OFF

Sub_protocol IRDRONE - 3

Model: IRDRONE

CH12	CH13
TAKE_OFF	EMG_STOP

Sub_protocol DHD_D4 - 4

Model: DHD D4

CH12	CH13
TAKE_OFF	EMG_STOP

Sub_protocol QX100 - 5

Model: REVELL QX100

BAYANG RX - 59

The Bayang receiver protocol enables master/slave trainning, separate access from 2 different radios to the same model,...

See the BAYANG protocol on how to activate ANAUX1 and ANAUX2 (Option/Telemetry=2).

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	ANAUX1	ANAUX2	FLIP	RTH	PICTURE	VIDEO

Sub_protocol Multi - 0

Use the telemetry to send the trainer information to the radio. Available in OpenTX 2.3.3, Trainer Mode Master/Multi

Sub_protocol CPPM - 1

Sending trainer channels to FrSky radios through telemetry does not work since the telemetry lines of the internal and external modules are shared (hardware limitation). On a STM32 module and with a simple hardware modification, you can go around this limitation using CPPM to send the trainer information to the radio. For more information check the CCPM Hardware Modification page.

Once your setup is complete and before enabling the internal module, you must check the "Disable Telemetry" box to stop the Multi module from sending any data to the radio and therfore freeing up the line for the internal module.

BUGSMINI - 42

Models: MJX Bugs 3 Mini and 3H

Telemetry enabled for RX RSSI, Battery voltage good/warning/bad

RX_Num is used to give a number to a given model. You must use a different RX_Num per MJX Bugs Mini. A maximum of 16 Bugs Mini are supported.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	ARM	ANGLE	FLIP	PICTURE	VIDEO	LED

ANGLE: angle is +100%, acro is -100%

Sub_protocol BUGSMINI - 0

Sub_protocol BUGS3H - 1

CH11
ALTHOLD

Cabell - 34

Homegrown protocol with variable number of channels (4-16) and telemetry (RSSI, V1, V2).

It is a FHSS protocol developed by Dennis Cabell (KE8FZX) using the NRF24L01+ 2.4 GHz transceiver. 45 channels are used frequency hop from 2.403 through 2.447 GHz. The reason for using 45 channels is to keep operation within the overlap area between the 2.4 GHz ISM band (governed in the USA by FCC part 15) and the HAM portion of the band (governed in the USA by FCC part 97). This allows part 15 compliant use of the protocol, while allowing licensed amateur radio operators to operate under the less restrictive part 97 rules if desired.

Additional details about configuring and using the protocol are available at the RX project at: https://github.com/soligen2010/RC_RX_CABELL_V3_FHSS

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
A	E	T	R	AUX1	AUX2	AUX3	AUX4	AUX5	AUX6	AUX7	AUX8	AUX9	AUX10	AUX11	AUX12

Sub_protocol CABELL_V3 - 0

4 to 16 channels without telemetry

Sub_protocol CABELL_V3_TELEMETRY - 1

4 to 16 channels with telemetry (RSSI, V1, V2). V1 & V2 can be used to return any analog voltage between 0 and 5 volts, so can be used for battery voltage or any other sensor that provides an analog voltage.

Sub_protocol CABELL_SET_FAIL_SAFE - 6

Stores failsafe values in the RX. The channel values are set when the sub-protocol is changed to 6, so hold sticks in place as the sub-protocol is changed.

Sub_protocol CABELL_UNBIND - 7

The receiver bound to the model is un-bound. This happens immediately when the sub-protocol is set to 7.

CG023 - 13

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	LIGHT	PICTURE	VIDEO	HEADLESS

Sub_protocol CG023 - 0

Models: EAchine CG023/CG031/3D X4

Sub_protocol YD829 - 1

Models: Attop YD-822/YD-829/YD-829C ...

CH5	CH6	CH7	CH8	CH9
FLIP		PICTURE	VIDEO	HEADLESS

CX10 - 12

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	FLIP	RATE

Rate: -100%=rate 1, 0%=rate 2, +100%=rate 3

Sub_protocol GREEN - 0

Models: Cheerson CX-10 green pcb

Same channels assignement as above.

Sub_protocol BLUE - 1

Models: Cheerson CX-10 blue pcb & some newer red pcb, CX-10A, CX-10C, CX11, CX12, Floureon FX10, JJRC DHD D1

CH5	CH6	CH7	CH8
FLIP	RATE	PICTURE	VIDEO

Rate: -100%=rate 1, 0%=rate 2, +100%=rate 3 or headless for CX-10A

Sub_protocol DM007 - 2

CH5	CH6	CH7	CH8	CH9
FLIP	MODE	PICTURE	VIDEO	HEADLESS

Sub_protocol JC3015_1 - 4

CH5	CH6	CH7	CH8
FLIP	MODE	PICTURE	VIDEO

Sub_protocol JC3015_2 - 5

CH5	CH6	CH7	CH8
FLIP	MODE	LED	DFLIP

Sub_protocol MK33041 - 6

CH5	CH6	CH7	CH8	CH9	CH10
FLIP	MODE	PICTURE	VIDEO	HEADLESS	RTH

DM002 - 33

Autobind protocol

Only 3 TX IDs available, change RX_Num value 0-1-2 to cycle through them

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP	LED	CAMERA1	CAMERA2	HEADLESS	RTH	RATE_LOW

E016H - 85

Autobind protocol

Model: Eachine E016H

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	STOP	FLIP	-	HEADLESS	RTH

EazyRC - 61

Autobind protocol

CH1	CH2	CH3	CH4
STEERING		THROTTLE

ESKY - 16

CH1	CH2	CH3	CH4	CH5	CH6
A	E	T	R	GYRO	PITCH

Sub_protocol Std - 0

Sub_protocol ET4 - 1

Models compatible with the ET4 transmitter like ESky Big Lama Multiple IDs but only one frequency...

ESKY150 - 35

ESky protocol for small models since 2014 (150, 300, 150X, ...)

Sub_protocol 4CH - 0

CH1	CH2	CH3	CH4
A	E	T	R

Sub_protocol 7CH - 1

CH1	CH2	CH3	CH4	CH5	CH6	CH7
A	E	T	R	FMODE	AUX6	AUX7

FMODE and AUX7 have 4 positions: -100%..-50%=>0, -50%..5%=>1, 5%..50%=>2, 50%..100%=>3

FX - 58

FEI XIONG

CH1	CH2	CH3	CH4
A	-	T	-

Sub_protocol 816 - 0

Model: FX816 P38, B17

Only 8 TX IDs available

Sub_protocol 620 - 1

Model: FX620 SU35

Sub_protocol 9630 - 2

Model: FX9630, FX9603, QIDI-550 and QIDI-560

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	RATE	GYRO	TrimR	TrimA	TrimE

FX9630 and FX9603 Gyro: -100%=6G small throw, 0%=6G large throw, +100%=3D

QIDI-550 Gyro: -100%=3D, 0%=6G, +100%=Torque

FY326 - 20

Sub_protocol FY326 - 0

Model: FY326 Q7 Quadcopter

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	RTH	HEADLESS	EXPERT	CALIBRATE

Sub_protocol FY319 - 1

Model: X6 FY319 Quadcopter (Needs Testing)

FQ777 - 23

Model: FQ777-124 (with SV7241A)

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	FLIP	RTH	HEADLESS	EXPERT

GW008 - 32

Model: Global Drone GW008 from Banggood

There are 3 versions of this small quad, this protocol is for the one with a XNS104 IC in the stock Tx and PAN159CY IC in the quad. The xn297 version is compatible with the CX10 protocol (green pcb). The LT8910 version is not supported yet.

CH1	CH2	CH3	CH4	CH5
A	E	T	R	FLIP

H8_3D - 36

Autobind protocol

Sub_protocol H8_3D - 0

Models: Eachine H8 mini 3D,Eachine E10, JJRC H20/H22/H11D

CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
FLIP	LIGTH	PICTURE	VIDEO	OPT1	OPT2	CAL1	CAL2	GIMBAL

JJRC H20: OPT1=Headless, OPT2=RTH

JJRC H22: OPT1=RTH, OPT2=180/360° flip mode

H8 3D: OPT1=RTH then press a direction to enter headless mode (like stock TX), OPT2=switch 180/360° flip mode

CAL1: H8 3D acc calib, H20/H20H headless calib CAL2: H11D/H20/H20H acc calib

Sub_protocol H20H - 1

CH6=Motors on/off

Sub_protocol H20 Mini - 2

Only 3 TX IDs available, change RX_Num value 0-1-2 to cycle through them

Sub_protocol H30 Mini - 3

Only 4 TX IDs available, change RX_Num value 0-1-2_3 to cycle through them

HISKY - 4

Sub_protocol Hisky - 0

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	GEAR	PITCH	GYRO	CH8

GYRO: -100%=6G, +100%=3G

Sub_protocol HK310 - 1

Models: RX HK-3000, HK3100 and XY3000 (TX are HK-300, HK-310 and TL-3C)

Failsafe supported

CH1	CH2	CH3	CH4	CH5
		T	R	AUX

KN - 9

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	DR	THOLD	IDLEUP	GYRO	Ttrim	Atrim	Etrim	Rtrim	HoverDebugging

Dual Rate: +100%=full range, Throttle Hold: +100%=hold, Idle Up: +100%=3D, GYRO: -100%=6G, +100%=3G

Sub_protocol WLTOYS - 0

Models: V966/V977/F959S/A160 J3/...

Sub_protocol FEILUN - 1

HONTAI - 26

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP	LED	PICTURE	VIDEO	HEADLESS	RTH	CAL

Sub_protocol HONTAI - 0

Sub_protocol JJRCX1 - 1

CH6
ARM

Sub_protocol X5C1 clone - 2

Sub_protocol FQ777_951 - 3

JJRC345 - 71

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP	HEADLESS	RTH	LED	UNK1	UNK2	UNK3

Sub_protocol JJRC345 - 0

Model: JJRC345

Sub_protocol SkyTmblr - 1

Model: DF-Models SkyTumbler

RTH not supported

KYOSHO2 - 93

Model: TX KT-17, Minium Edge 540, Minium Citabria

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10

LOLI - 82

LOLI3 receivers: https://github.com/wooddoor/Loli3

Failsafe supported. Once failsafe values for the 8 channels have been configured in Custom mode, wait for the RX to learn them, then set Failsafe to Receiver.

Telemetry supported: RX RSSI, TX LQI (percentage of received telemetry packets), A1 and A2 with a Ratio=25.5 and Offset=0.

Extended limits supported.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

RX features can be configured using the multiLOLI LUA script on OpenTX or manually using the table below:

Config on	For channel	Switch	Servo	PPM	SBUS	PWM
CH9	CH1	-100%	0%	+50%	-	+100%
CH10	CH2	-100%	0%	-	-	+100%
CH11	CH3	-100%	0%	-	-	-
CH12	CH4	-100%	0%	-	-	-
CH13	CH5	-100%	0%	-	+50%	-
CH14	CH6	-100%	0%		-	-
CH15	CH7	-100%	0%	-	-	+100%
CH16	CH8	-100%	0%	-	-	-

MouldKg - 90

Mould King 2.4GHz TX: Technic Brick models

Up to 4 bricks can be controlled at the same time.

Option field	Value
0	The module will act like the original radio which will bind every time and attach to the first brick in bind mode
1	The module will control the brick number RX_num
2	The module will control the brick number RX_num and RX_num+1
3	The module will control the brick number RX_num, RX_num+1 and RX_num+2
4	The module will control the brick number RX_num, RX_num+1, RX_num+2 and RX_num+3

To associate a brick to a RX number (RX_num above), set this RX number under the protocol, set option to 1, launch a bind and power on the brick you want to control. Repeat this for every brick using a different RX number each time and then indicate the number of bricks to be controlled using the Option field.

Example: I want to control 2 bricks. I select RX number 1, set option to 1 and launch a bind on the first brick. I select RX number 2, set option to 1 and launch a bind on the second brick. Now to control both bricks I set RX number to 1 and option to 2. Therefore brick1 will react to channels CH1 to CH4 and brick2 to channel CH5 to CH8. On another model I can control 4 other bricks, bind each brick to RX number 3 to 6 and then finaly set RX number to 3 and option to 4 to contol the 4 bricks with CH1 to CH16.

Sub_protocol Analog - 0

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
Brick1_A	Brick1_B	Brick1_C	Brick1_D	Brick2_A	Brick2_B	Brick2_C	Brick2_D	Brick3_A	Brick3_B	Brick3_C	Brick3_D	Brick4_A	Brick4_B	Brick4_C	Brick4_D

Sub_protocol Digit - 1

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
Brick1_A	Brick1_B	Brick1_C	Brick1_D	Brick2_A	Brick2_B	Brick2_C	Brick2_D	Brick3_A	Brick3_B	Brick3_C	Brick3_D	Brick4_A	Brick4_B	Brick4_C	Brick4_D

NCC1701 - 44

Model: Air Hogs Star Trek USS Enterprise NCC-1701-A

Autobind protocol

Telemetry: RSSI is a dummy value. A1 voltage is dummy but used for crash detection. In case of a crash event A1>0V, you can assign a sound to be played on the TX in that case (siren on the original transmitter).

Only 9 IDs available, cycle through them using RX_Num.

CH1	CH2	CH3	CH4	CH5
A	E	T	R	Warp

Potensic - 51

Model: Potensic A20

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
A	E	T	R	TAKE_OFF/LANDING	EMERGENCY	MODE	HEADLESS

TAKE_OFF/LANDING: momentary switch -100% -> +100%

EMERGENCY: Stop +100%

MODE: Beginner -100%, Medium 0%, Advanced +100%

HEADLESS: Off -100%, On +100%

PROPEL - 66

Model: PROPEL 74-Z Speeder Bike

Autobind protocol

Telemetry: RSSI is equal to TX_LQI which indicates how well the TX receives the RX (0-100%). A1 (with a ratio of 25.5) voltage should indicate the numbers of life remaining 0.2->0.1->0.0(not tested). A2 (with a ratio of 25.5) is giving the model status: 12.8=flying, 0.8=taking off, 0.4=landing, 0=landed/crashed

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14
A	E	T	R	LEDs	RollCW	RollCCW	Fire	Weapons	Calib	Alt_Hold	Take_off	Land	Training

Q2X2 - 29

Sub_protocol Q222 - 0

Models: Q222 v1 and V686 v2

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	FLIP	LED	MODULE2	MODULE1	HEADLESS	RTH	XCAL	YCAL

Sub_protocol Q242 - 1 and Q282 - 2

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12
A	E	T	R	FLIP	LED	PICTURE	VIDEO	HEADLESS	RTH	XCAL	YCAL

Model: JXD 509 is using Q282 with CH12=Start/Stop motors

Realacc - 76

Model: Realacc R11, Eachine E017

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP	LIGHT	CALIB	HLESS	RTH	THR_CUT	ROTATE

Redpine - 50

Link to the forum

Sub_protocol FAST - 0

Sub_protocol SLOW - 1

SGF22 - 97

Autobind protocol

Model: SGF22

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10
A	E	T	R	MODE	FLIP	LIGHT	PHOTO	VIDEO	TRIMRESET

Shenqi - 19

Autobind protocol

Model: Shenqiwei 1/20 Mini Motorcycle

CH1	CH2	CH3	CH4
-	-	T	R

Throttle +100%=full forward,0%=stop,-100%=full backward.

Symax - 10

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	RATES	PICTURE	VIDEO	HEADLESS

RATES: -100%(default)=>disable dynamic trims, +100%=> higher rates by enabling dynamic trims (except for Headless)

Sub_protocol SYMAX - 0

Models: Syma X5C-1/X11/X11C/X12

Sub_protocol SYMAX5C - 1

Model: Syma X5C (original) and X2

V2X2 - 5

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP	LIGHT	PICTURE	VIDEO	HEADLESS	MAG_CAL_X	MAG_CAL_Y

Sub_protocol V2x2 - 0

Models: WLToys V202/252/272/A959/K969/K979/K989/K999, JXD 385/388, JJRC H6C, Yizhan Tarantula X6 ...

PICTURE: also automatic Missile Launcher and Hoist in one direction

VIDEO: also Sprayer, Bubbler, Missile Launcher(1), and Hoist in the other dir

Sub_protocol JXD506 - 1

Model: JXD 506

CH10	CH11	CH12
Start/Stop	EMERGENCY	CAMERA_UP/DN

Sub_protocol MR101 - 2

TX: MR101, model: Dromida XL

Only 1 ID available. If you have a TX contact me on GitHub or RCGroups.

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11
A	E	T	R	FLIP		PICTURE	VIDEO		MOT_ON_OFF	AUTO

MOT_ON_OFF: momentary switch (you need to maintaint it for at least 1.5sec for on or off)

AUTO: Land=-100% Takeoff=+100%

The model can work with a none centered throttle.

V761 - 48

Gyro: -100%=Beginner mode (Gyro on, yaw and pitch rate limited), 0%=Mid Mode ( Gyro on no rate limits), +100%=Mode Expert Gyro off

Calib: momentary switch, calib will happen one the channel goes from -100% to +100%

Flip: momentary switch: hold flip(+100%), indicate flip direction with Ele or Ail, release flip(-100%)

RTN_ACT and RTN: -100% disable, +100% enable

Sub_protocol 3CH - 0

Models: Volantex V761-1, V761-3 and may be others

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
-	E	T	R	GYRO	CALIB	FLIP	RTN_ACT	RTN

Sub_protocol 4CH - 1

Models: Volantex V761-4+ and Eachine P51-D, F4U, F22 and may be others

If the model (761-11 and above) sends telemetry then the battery status ok/empty is in A1 (4.4V -> 2.2V) and RSSI gets a dummy value of 100.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	GYRO	CALIB	FLIP	RTN_ACT	RTN

Sub_protocol TOPRC - 2

Models: Top RC Hobby Spitfire, P51D, BF-109

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	GYRO	CALIB	FLIP	RTN_ACT	RTN

XERALL - 91

Model: Xerall TankCopter

To bind/link the model faster put the throttle low before powering up the model.

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13
A	E	T	R	Fly/Tank	Takeoff/Land/Emerg	Rate	HeadLess	Photo	Video	TrimR	TrimE	TrimA

Fly/Tank: -100%=Fly, +100%=Tank

Takeoff/Land/Emerg: momentary switch -100%->+100%, same switch for all 3 functions. For Takeoff throttle must be centered before actionning the momentary switch. For Emergency stop hold the momentary switch for a few sec.

Unlock the motors is achieved like on the original radio by putting sticks in the bottom corners (position depends on your mode 1,2,3,4) and throttle has to be raised to center before recentering the sticks for the motors to keep spinning. Takeoff happens as soon as the throttle goes above center.

Rate: -100%=Low, +100%=High

HeadLess: -100%=Off, +100%=On

Photo: momentary switch -100%->+100% (short press on the original remote)

Video: -100%=Off, +100%=On (long press on the original remote)

YD717 - 8

Autobind protocol

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9
A	E	T	R	FLIP	LIGHT	PICTURE	VIDEO	HEADLESS

Sub_protocol YD717 - 0

Sub_protocol SKYWLKR - 1

Sub_protocol SYMAX4 - 2

Sub_protocol XINXUN - 3

Sub_protocol NIHUI - 4

Same channels assignement as above.

ZSX - 52

Model: JJRC ZSX-280

Autobind protocol

CH1	CH2	CH3	CH4	CH5
-	-	T	R	LIGHT

SX1276 RF Module

FRSKYR9 - 65

R9 RXs must be flashed with latest ACCST.

Extended limits and failsafe supported.

Full telemetry supported.

Notes:

The choices of CH1-8/CH9-16 and Telem ON/OFF is available in OpenTX 2.3.10 nightlies. The default is CH1-8 Telem ON.
Telemetry from TX to RX is available in OpenTX 2.3.10 nightlies.
Power adjustment is not supported on the T18.

Sub_protocol R9_915 - 0

FLEX 915MHz, 16 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol R9_868 - 1

FLEX 868MHz, 16 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol R9_915_8CH - 2

FLEX 915MHz, 8 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol R9_868_8CH - 3

FLEX 868MHz, 8 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

Sub_protocol R9_FCC - 4

FCC, 16 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8	CH9	CH10	CH11	CH12	CH13	CH14	CH15	CH16

Sub_protocol R9_FCC_8CH - 6

FCC, 8 channels

CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8
CH1	CH2	CH3	CH4	CH5	CH6	CH7	CH8

OpenLRS module

OpenLRS - 27

This is a reservation for OpenLRSng which is using Multi's serial protocol for their modules: https://openlrsng.org/. On the Multi side there is no protocol affected on 27 so it's just ignored.

Files

Protocols_Details.md

Latest commit

History

Protocols_Details.md

File metadata and controls

Protocols details

Useful notes and definitions

Bind on channel feature

Protocol selection in PPM mode

Serial mode

Available Protocol Table of Contents (Listed Alphabetically)

A7105 RF Module

BUGS - 41

FLYSKY - 1

Sub_protocol Flysky - 0

Sub_protocol V9X9 - 1

Sub_protocol V6X6 - 2

Sub_protocol V912 - 3

Sub_protocol CX20 - 4

FLYSKY AFHDS2A - 28

Sub_protocol PWM_IBUS - 0

Sub_protocol PPM_IBUS - 1

Sub_protocol PWM_SBUS - 2

Sub_protocol PPM_SBUS - 3

Sub_protocol PWM_IBUS16 - 4

Sub_protocol PPM_IBUS16 - 5

Sub_protocol PWM_SBUS16 - 6

Sub_protocol PPM_SBUS16 - 7

FLYSKY AFHDS2A RX - 56

Sub_protocol Multi - 0

Sub_protocol CPPM - 1

HEIGHT - 53

Sub_protocol 5CH - 0

Sub_protocol 8CH - 1

HUBSAN - 2

Sub_protocol H107 - 0

Sub_protocol H301 - 1

Sub_protocol H501 - 2

JOYSWAY - 84

Kyosho - 73

Sub_protocol FHSS - 0

Sub_protocol Hype - 1

Pelikan - 60

Sub_protocol Pro - 0

Sub_protocol Lite - 1

Sub_protocol SCX24 - 2

WFLY2 - 79

CYRF6936 RF Module

DEVO - 7

Sub_protocol 8CH - 0

Sub_protocol 10CH - 1

Sub_protocol 12CH - 2

Sub_protocol 6CH - 3

Sub_protocol 7CH - 4

WK2X01 - 30

Sub_protocol WK2801 - 0

Sub_protocol WK2401 - 1

Sub_protocol W6_5_1 - 2

Sub_protocol W6_6_1 - 3

Sub_protocol W6_HEL - 4 and W6HEL_I - 5

DSM - 6

Sub_protocol DSM2_1F - 0

Sub_protocol DSM2_2F - 1

Sub_protocol DSMX_1F - 2

Sub_protocol DSMX_2F - 3

Sub_protocol AUTO - 4

Sub_protocol DSMR_1F - 5

Sub_protocol DSM2SFC - 6

DSM_RX - 70

Sub_protocol Multi - 0

Sub_protocol CPPM - 1

E010R5 - 81

E01X - 45

Sub_protocol E012 - 0

Sub_protocol E015 - 1

E129 - 83

Sub_protocol E129 - 0

Sub_protocol C186 - 1

J6Pro - 22