RadioMaster XR4 User Manual

2.4
GHZ
u.Fl
bind
LR1121
2419
480309
RX
RX TX
SPECIFICATIONS
•Item: XR4 Gemini Xrossband Dual-Band Receiver
•MCU: ESP32D4
•RF Chip: LR1121 x 2
•RF connector: IPEX-1 X 2
•Antenna: Dual-Band T Antenna x 2 (Included)
•Frequency Range: 2.4GHz / Sub-G 900MHz
•Maximum receive refresh rate: DK500Hz / K1000Hz
•Minimum receiver refresh rate: 50Hz
•Working voltage: DC 5.0 - 12.6v
•Weight: 1.7g (without antenna)
•Dimension: 22mm * 18mm * 4mm
•Firmware Version: ExpressLRS v3.5.1 pre-installed
•Bus interface 1: CRSF
•Bus interface 2: UART
INCLUDES
1 * XR4 Gemini Xrossband Dual-Band Receiver
2 * Dual-Band T-Antenna
1 * CRSF Wire
3 * Heat-Shrinkable Tube
1 * Manual Card
DEFAULT FIRMWARE
RadioMaster XR4 2.4/900 Gemini RX
For more information, please visit the ELRS website:
https://www.expresslrs.org/2.0/
TOP
u.fl
LR1121
2419
480309
−
5V
TX
5V gnd
XR4 Receiver User Manual
BOTTOM
18mm
−
5V TX RX
100mm
CONFIGURATION
Identifier Configuration/MSP
USB VCP 115200
UART1 115200
UART2 115200
Open Betaflight Configurator, go to Ports tab and enable the corresponding
UART as a Serial RX (e.g. UART2 as shown above)Save and Restart.
Receiver
Serial (via UART) Receiver Mode
•
The UART for the rec eiver must be s et to 'Serial Rx' (in the Ports tab)
• Selec t the correc t data format from the drop-down, below:
CRSF
Serial Receiver Provider
On the Configuration tab, click on Serial-based receiver on the Receiver
panel, and select CRSF.
TRADITIONAL BINDING
Binding Phrase field must be uncommented in Device options on the RX.
1. Power OFF your transmitter/radio.
2. Plug in and unplug your receiver 3 times.
3. Make sure the LED is doing a quick double blink, which indicates
the receiver is in bind mode.
4. Power ON your transmitter/radio and use the [BIND] button
on the ExpressLRS Lua script, which sends out a binding pulse.
5. If the receiver has a solid light, it's bound!
1.7
GRAMS
Serial RX