RadioMaster RP4-TD Receiver User Manual

Brand: RADIOMASTER

Product Features

Type: ISM

MCU: ESP32

RF Chip: SX1281 x 2

Telemetry RF power: max 100mw x 2

Antenna: 65mm 2.4GHz T Antenna x 2

Frequency Range: 2400 MHz to 2480 MHz

Maximum receive refresh rate: 500Hz / F1000Hz

Minimum receiver refresh rate: 25Hz

Working voltage: 4.5-12.4V

Weight: 1.4g (Including two antenna)

Dimension: 22mm*13mm*4mm

Firmware Version: ExpressLRS v3.3.1 pre-installed

FW Target: RadioMaster RP3 Diversity 2400 RX

Bus interface: CRSF

Backup Interface: UART

Diagram Description

A diagram illustrates the RP4-TD receiver board layout. It shows pins labeled RX, TX, and 5V. Two antennas are depicted as connected to the board.

Binding Method

Traditional Binding

For traditional binding, the binding phrase must be commented out in user_defines on the RX.

Power off your transmitter.
Plug in and unplug your receiver three times.
Make sure the LED is doing a quick double blink, which indicates the receiver is in bind mode.
Use the [BIND] button on the ExpressLRS Lua script, which sends out a binding pulse.
If the receiver has a solid light, it's bound!

Status Indicators

Receiver Status	Status Light	Meaning
Receiver disconnected	Slow flash (500ms)	Waiting for transmitter
WIFI upgrade mode	Fast flash (25ms)	WIFI On
Bind mode	Double flash	Receiver in bind mode
Mode matching failed	Triple flash	Receiver functional, mode selection error
Receiver connected	Solid	Receiver functional

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