RadioMaster RP2 ELRS 2.4GHz Receiver User Manual

Overview

This document provides essential specifications, configuration guidance, and operational instructions for the RadioMaster RP2 ELRS 2.4GHz Receiver.

Physical Layout and Diagrams

Top View of RP2 Receiver: Depicts the RP2 circuit board (labeled "RP2 V1.2") with a prominent "CERAMIC ANTENNA" and an "LED" indicator. Key pin connections are labeled: "RX", "TX", "5V", and "G" (Ground). The board's dimensions are approximately 13mm.

Bottom View of RP2 Receiver: Shows the underside of the board, marked with "ELRS" and "ESP 8285". Pinouts for "5V", "TX", and "RX" are visible. A note highlights the "Firmware upgrade button," specifying that it requires shorting the "GND" pin with a metal object during power-up. Dimensions of 11mm and 7mm are also indicated.

Specifications

Specification	Details
Size	13mm x 11mm x 7mm
Weight	2.2g (with antenna)
MCU	ESP8285
RF Chip	SX1281
Frequency Band	2400MHz - 2483MHz
Input Voltage	5V
Receiver Protocol	CRSF
Firmware (pre-installed)	ExpressLRS v3.0

Package Contents

1x RP2 ELRS 2.4GHz Receiver
1x User Manual Card
4x Silicone wires

Default Firmware Information

The receiver comes with default firmware: RadioMaster RP1/2 2400 RX.

For the latest firmware and additional information, please visit the ExpressLRS website: https://www.expresslrs.org/2.0/

Configuration with Flight Controllers

To integrate the RP2 receiver with flight controllers, such as those running Betaflight:

Launch the Betaflight Configurator application.
Navigate to the Ports tab.
Locate the UART port you intend to use for the receiver (e.g., UART2) and enable it as a Serial RX.
Apply the changes and restart the Betaflight Configurator.

Within the Configuration tab:

Confirm that the selected UART is set to 'Serial Rx' in the Ports tab.
Choose the appropriate data format from the available dropdown options.
In the Receiver section, select 'Serial-based receiver' and then choose 'CRSF' as the Serial Receiver Provider.

Typical configuration parameters are as follows:

Identifier	Configuration/MSP Baud Rate	Serial RX Status
USB VCP	115200
UART1	115200
UART2	115200	Enabled

Traditional Binding Procedure

Follow these steps to establish a connection (bind) between your receiver and transmitter:

Ensure your transmitter/radio is powered OFF.
Connect and disconnect the receiver's power supply three times in quick succession. The receiver's LED should flash rapidly (a double blink pattern), indicating it has entered bind mode.
Power ON your transmitter/radio.
Access the ExpressLRS Lua script interface on your transmitter. Select the [BIND] button and confirm to initiate the binding pulse.
A solid LED on the receiver signifies a successful binding process.

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