Component Description

Definition of Buttons, Switches Types and Channels

SBUS-1
Channel Number	Physical Channel Type	Default Physical Switch	Remarks
1	Aileron joystick	S1	-
2	Elevator joystick (American mode)	S2	-
3	Throttle joystick (American mode)	S3	-
4	Rudder joystick	S4	-
5	Three-position switch T1	T1	-
6	Three-position switch T2	T2	-
7	Centering roller W1	W1	-
8	Centering roller W2	W2	-
9	Button C	C	Default non-latching
10	Button D	D	Default non-latching
11	Button K1	K1	Default non-latching
12	Button K2	K2	Default non-latching
13	Button K3	K3	Default non-latching
14	Button K4	K4	Default non-latching
15	Button H	H	Default non-latching
16	Button A	A	Default non-latching

SBUS-2
Channel Number	Physical Channel Type	Default Physical Switch	Remarks
1	Five-dimensional button B	B1	B1-left/right
2	Five-dimensional button B	B2	B2-up/down
3	Five-dimensional button B	B3	B3-middle
4	Button L1	L1	Default non-latching
5	Button L2	L2	Default non-latching
6	Button R1	R1	Default non-latching
7	Button R2	R2	Default non-latching

Schematic diagram of the Ground unit interface

Definition of status indicators

Definition of ground-end indicators

Power indicator light

Power indicator light

Battery level indicator light

Definition of the battery level indicator on the remote control
●	○	○	○	0%-25%
●	●	○	○	25%-50%
●	●	●	○	50%-75%
●	●	●	●	75%-100%

Note：● On ○ Off

Device binding operation

Note: The device has been bound at the factory, and there is no need to bind it again during normal use.

Power on the sky end, and turn on the ground end (remote control).
Press the binding button on the sky end. The indicator light will flash, indicating that it has entered the binding state. Then click "Bind" in the RC software of the remote control to complete the binding. After binding, the page will display "Bound".

Schematic Diagram of Common Connections

Take the X6 AutoPilot and the network port pod as an example:

Telemetry settings:

Taking QGC (QGroundControl) as an example, you can configure the parameters in "Communication Links" (as shown in the figure below). All you need to do is to confirm that the telemetry level of the flight controller is TTL, the baud rate is the same, and the TX and RX are cross-connected.

Video transmitter settings:

Taking QGC as an example, you can configure the streaming address in "General" (as shown in the figure below).

Preparations Before Use

Power On/Off and Charging of the Remote Controller

Power On of the Remote Controller

Power on the remote control

When the remote control is turned off, briefly press the power button once, and the battery indicator will light up. Then, press and hold the power button. When the battery indicator lights up in sequence and is accompanied by a beeping sound from the buzzer, it means that the remote control has been successfully powered on.

Power off the remote control

When the remote control is turned on, long-press the power button until a pop-up window appears on the system interface, and then touch the power-off icon to turn off the remote control.
Forced shutdown: When the remote control is on, long-press the power button and the R2 button simultaneously for about 15 seconds, and the remote control will be forcibly powered off.

Other functions of the power button

Screen off: When the remote control is turned on, briefly press the power button, and the screen of the remote control will go off and enter the energy-saving state.

Charging steps for the remote control

Please use the power adapter and charging cable that come with the original factory to charge the remote control.

Connect the S2 remote control and the power adapter with the charging cable;
At this time, if the power indicator is flashing, it means that it is charging;
When the power indicator stays lit, it means that the charging is complete.

Installation and Use of the Antenna

Use of the Remote Controller Antenna

The antenna should be placed vertically upwards relative to the screen of the remote controller (or placed vertically upwards perpendicular to the horizontal plane), ensuring that the side of the antenna always faces the drone.
Antennas must not be stacked or crossed.

Installation of the Sky-End Antenna

The antenna body, feeder line, and SMA connectors should avoid direct contact with metal and carbon fiber structural parts, and keep a distance of at least 10 mm.
When routing the feeder line, keep it away from devices with large currents and severe electromagnetic interference, such as motors and electronic speed controllers.
The two sky-end antennas should be kept apart from each other as much as possible, with a mutual spacing of at least 20 cm.
On a multi-rotor drone, the standard omnidirectional antenna at the sky end should be installed vertically downward from the horizontal plane of the fuselage.
On a fixed-wing drone, the antenna can be installed vertically upward or downward from the horizontal plane of the fuselage.
The connection between the sky-end antenna feeder line and the connectors at both ends should not be pulled forcefully or bent excessively, otherwise the feeder line will be damaged.
During flight, avoid having the communication between the drone and the ground end blocked by obstacles.
The SMA connectors of the antenna must be tightened.

Use of the management software

Remote control settings

Joystick Calibration

The joystick calibration function can calibrate the neutral positions and maximum limits of the left and right joysticks on the remote control. Regularly calibrating the joysticks helps maintain the accuracy of the joystick channel output.

Joystick Calibration Steps

Before performing joystick calibration, please ensure that the left and right joysticks of the remote control are naturally at rest and not displaced by external forces.

Enter the "Joystick Calibration" interface and click "Start Calibration". Then the following interface will appear.

According to the prompts, if the left and right joysticks are already at rest naturally but the joystick channels are shown to be not centered, it means that the neutral point of the joystick has shifted. At this time, do not touch the joysticks and directly click "Next".

The neutral point calibration is completed. Next, calibrate the maximum limit. Follow the prompts on the page, push each joystick to the maximum limit in every direction one by one, and then click "Complete Calibration".

The "Joystick Calibration" menu will return to the initial interface, and the calibration is finished.

Dial wheel calibration

The dial wheel calibration function can calibrate the neutral positions and maximum limits of the left and right dial wheels on the remote control. Regular calibration of the dial wheels helps maintain the accuracy of the output of the dial wheel channels.

Steps for Dial Wheel Calibration

Before performing the dial wheel calibration, please make sure that the left and right dial wheels of the remote control are naturally stationary and not displaced by external forces.
In the "Dial Wheel Calibration" menu, click "Start Calibration", and then the following interface will appear.

According to the prompts, if the two dial wheels are already at rest naturally but the output values of the joystick channels are not 0, it means that the neutral points of the dial wheels have shifted. At this time, do not touch the dial wheels and directly click "Next".

The calibration of the neutral point has been completed. Next, calibrate the maximum limit. Follow the prompts on the interface, push each dial wheel to the maximum limit in every direction in turn, and then click "Complete Calibration".

Channel Settings

The channel setting function allows you to set the travel amount, neutral point, positive and negative directions, as well as the channel mapping of each channel on the remote control.

Servo travel amount

The default travel amount range of the remote control is from 200 to 1800. Select the target channel and input the required travel amount value, then the change can be made successfully.

Neutral point adjustment

The default neutral point travel amount of the remote control is 1000. Except that the neutral point of the multi-dimensional switch can be set, the neutral points of the other channels are automatically calculated and generated according to the settings of the travel amount.

Channel reverse

Select the target channel and click the corresponding positive/negative switch to successfully set the forward and reverse directions of the channel.

Channel Mapping

The remote control supports a total of 21 physical channels and 32 communication channels, allowing users to freely define the mapping relationships between physical buttons, switches, joysticks, and communication channels through the mapping function. Select the target channel, click the channel mapping button, a list of switches will pop up, and then select the required switch to complete the mapping successfully.

System Settings

The system setting function can be used to set the remote control buttons, multi-dimensional switches, dials, joystick modes, USB configurations, internal and external module switching, and channel configurations.

Button Settings and Multi-Dimensional Switches

This function can be used to set the output mode of all buttons. By default, it is non-self-locking.

Regarding the working modes of self-locking and non-self-locking

Self-locking: After pressing the self-locking button, the button will bounce back, but the channel of this button will keep outputting, with the output value being 1800. When the button is pressed again, the channel output returns to 200.

Non-self-locking: When the non-self-locking button is pressed, the output of this channel is 1800. When the hand is released, the channel output returns to 200.

Dial wheel settings

Through this function, you can switch between the angle output and the angular velocity output of the dial wheel.

Mode Settings

Through this function, you can switch the joystick modes. The available modes include American style, Japanese style, Chinese style, and custom.

USB Settings

You can switch the configuration between USB-C video transmission and data transmission. Video transmission means that the internal software of the remote control can be used to output images, while data transmission means accessing the internal storage of the remote control via a computer and a USB cable. After selecting data transmission, the system window drops down, and the USB preference is set to [File Transfer].

Module Settings

Through this function, you can switch between the internal and external video transmission modules. After switching to the external module, the internal video transmission module will automatically shut down.

An external video transmission module can be connected via the E1 interface on the top of the remote control. The wire sequence definition of the E1 interface is as follows:

Channel Settings

This function allows you to save the current channel configuration as a file to the local device, and also enables you to load other channel configuration files to set up the current channel configuration.

Video Transmission

This function can be used to set up the video transmission and view its status.

Video Transmission Settings

The settings interface allows operations such as binding, selection of frequency point working modes, selection of baud rates, selection of modulation and coding modes, and restoring factory settings.

Image transmission status

The status interface allows you to view important status information about the link between the receiver and the transmitter.

General Settings

General settings can be used to configure the server.

Upgrade

It is possible to query the versions of the transmitter, receiver, remote control, and management software online and perform upgrades.

Version

You can view the device types and their version numbers.

Video and Data Transmission Forwarding and Sharing

The remote control turns on the hotspot and forwards it to the PC via Mavlink.

First, make sure that the link connection between the remote control and the sky end is established;

Turn on the hotspot of the remote control. Click [Settings] - [Network & Internet] - [Hotspot & Network Sharing] - [WLAN Hotspot] - [Turn On]. After turning it on, connect the PC to this hotspot;

Open QGC and ensure that the image output is normal;

Click [Application Settings].

The video forwarding functions are as follows:

【General】—【Video Settings】—UDP Forwarding IP Address and Port (Enter the IP address and port of the PC's Wi-Fi) —UDP Forwarding Code Stream Settings: H265

The Mavlink forwarding functions are as follows:

Click on 【Mavlink】—【Ground station】—【Enable Mavlink forwarding】, enter the host name. For the host name, enter the IP address and port number of the PC's Wi-Fi. After the input, you need to restart the software for the configuration to take effect.

Install QGC on the PC side, enter [General Settings] - Select UDP h.265 Video Stream for the video source - Multicast IP: 0.0.0.0 or fill in the local IP address of the PC, and UDP Port: 7000, as shown in the following figure:

Establish a communication connection to obtain flight information. Click [Communication Connection] - [Add].

After the configuration is confirmed, click [Connect].

Precautions

Before use, it is essential to check whether the battery is fully charged.

Before use, please check whether the antenna is tightened and placed as required to achieve the best results.

For the first use, please ensure that the firmware has been upgraded to the latest version.

During use, avoid any obstruction or strong interference.

requently Asked Questions

Q:The data transmission cannot be connected?

A:Check whether the baud rate setting is consistent with that of the flight controller. Check whether the TX and RX between the air unit and the flight controller are reversely connected. Check whether the data transmission levels of the flight controller are consistent (the factory default is TTL).

Q:Can other apps be installed on the remote control?

A:Yes, it can. The remote control already has the commonly used open-source flight control ground station QGC built-in.

Q:How to bind the devices?

A:Power on the air unit, and turn on the ground unit (remote control). Press the binding button on the air unit until the indicator light blinks to enter the binding state. Then click "Bind" in the RC software of the remote control to complete the binding. After binding, the page will show "Bound".

Q:How to display images when using an Ethernet camera?

A:Just make sure that the Ethernet configuration of the Android system is on the same network segment as the camera, and then set the RTSP-based streaming address corresponding to the camera in QGC.

OneRC R20