FrSky X (D16)

Details
Protocol Number:  15
Autobind:  No
Channel Re-mapping:  No
Extended Limits:  Yes
Failsafe Support:  Yes
Receiver Match:  Yes
Telemetry:  Yes
Option Value:  Frequency fine tuning
Frequency tuning is required for this protocol.  See the Frequency Tuning page for more details.
Notes
Models:  FrSky D16 receivers, including X4R, X6R, X8R, XSR, XM+, and SxR, running ACCST v1 firmware.  D16 compatible receivers.
FrSky receivers running ACCST v2 firmware should use the FrSkyX2 protocol - they are not supported by this protocol.
Full telemetry is supported, including bi-directional capabilities, enabling LUA scripts to be used to configure SxR receivers and Betaflight parameters (for example).
Listen Before Talk (LBT) is supported. Use the EU/LBT sub-protocols for receivers running EU / LBT firmware.
In OpenTX the FrSky X protocol is accessed as FrSky, with subprotocol D16. 
The FrSky protocol also has subprotocols for ACCST v1 D16 receivers in FCC and EU/LBT modes and D16 8 channel mode, as well as FrSky V receivers and FrSky D (D8) receivers.
Binding
When binding a D16 receiver the radio will prompt you to choose the bind configuration.  This prompt allows you to configure the receiver outputs, in the same way that it can be configured with physical jumpers placed on the PWM output pins during bind.
D16 Binding Options
The selection you make determines which channels will be output on the PWM pins of the receiver, and whether telemetry is on or off.  The remaining channels will be output on the SBUS port.
For Example:
Ch1-8 Telem ON will output the radio channels 1-8 on the receiver's PWM pins and channels 9-16 on the SBUS port, with telemetry enabled.  This configuration could typically be used on a model with servos connected directly to the receiver.
Ch9-16 Telem ON will output the radio channels 1-8 on the SBUS port and 9-16 on the receiver's PWM pins, with telemetry enabled.  This configuration could typically be used on a model with a flight controller connected to the SBUS port and accessories (such as a camera gimbal) connected to the PWM pins.
Refer to your receiver documentation for more information.
Sub Protocols
0 - CH_16
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
1 - CH_8
FCC protocol, 8 channels @9ms.
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
2 - EU_16
EU-LBT (listen before talk) 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
3 - EU_8
EU-LBT (listen before talk) protocol, 8 channels @9ms. 
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH8
4 - Cloned
Uses the identifier learnt from another FrSky radio using the FrSkyRX/CloneTX mode.
16 Channels
5 - Cloned_8
Uses the identifier learnt from another FrSky radio using the FrSkyRX/CloneTX mode.
8 Channels

FrSky V

FrSky X2 (D16)

Last modified 2yr ago

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Details

Notes

Binding

Sub Protocols

0 - CH_16

1 - CH_8

2 - EU_16

3 - EU_8

4 - Cloned

5 - Cloned_8