How to Use Futaba R404SBS-E: Examples, Pinouts, and Specs

The Futaba R404SBS-E is a 4-channel 2.4GHz receiver designed for use in remote control (RC) applications. It is part of Futaba's advanced telemetry-enabled receiver lineup, offering reliable signal reception and seamless compatibility with Futaba's T-FHSS SR (Super Response) protocol transmitters. This receiver is ideal for RC cars, boats, and other applications requiring precise and low-latency control.

• RC cars for competitive racing or hobbyist use
• RC boats for high-performance control
• Robotics projects requiring low-latency wireless communication
• Any application requiring a compact, high-speed, and reliable receiver

The following table outlines the key technical details of the Futaba R404SBS-E receiver:

The Futaba R404SBS-E features a compact design with clearly labeled ports for easy connection. Below is the pin configuration:

1. Power Connection: Connect a power source (3.7V to 7.4V) to the BAT pin. Ensure the power supply is stable and within the specified voltage range.
2. Servo/ESC Connections: Connect servos or electronic speed controllers (ESCs) to the CH1, CH2, CH3, and CH4 pins as required by your application.
3. Binding the Receiver:
   • Turn on your Futaba transmitter and set it to binding mode.
   • Power on the R404SBS-E receiver while holding the binding button (if applicable).
   • Wait for the receiver's LED to indicate a successful bind (refer to the transmitter's manual for LED behavior details).
4. Telemetry Setup (Optional): If using telemetry sensors, connect them to the S.BUS2 port. Configure the sensors via the transmitter as needed.
5. Failsafe Configuration: Set up failsafe positions for each channel using your Futaba transmitter to ensure safe operation in case of signal loss.

• Antenna Placement: Ensure the receiver's antenna is positioned away from metal parts or other sources of interference for optimal signal reception.
• Voltage Range: Do not exceed the specified voltage range (3.7V to 7.4V) to avoid damaging the receiver.
• Compatibility: Use only Futaba T-FHSS SR-compatible transmitters to ensure proper operation.
• Environment: Avoid exposing the receiver to water, dust, or extreme temperatures unless it is housed in a protective enclosure.

If you are using the R404SBS-E with an Arduino UNO for telemetry data processing via the S.BUS2 port, the following example demonstrates how to read data:

#include <SoftwareSerial.h>

// Define the S.BUS2 pin for telemetry data
#define SBUS2_PIN 2

// Initialize SoftwareSerial for S.BUS2 communication
SoftwareSerial sbus2Serial(SBUS2_PIN, -1); // RX only, no TX needed

void setup() {
  Serial.begin(9600); // Start serial monitor for debugging
  sbus2Serial.begin(100000); // S.BUS2 operates at 100kbps
  Serial.println("Futaba R404SBS-E Telemetry Example");
}

void loop() {
  if (sbus2Serial.available()) {
    // Read telemetry data from S.BUS2
    uint8_t data = sbus2Serial.read();
    Serial.print("Telemetry Data: ");
    Serial.println(data, HEX); // Print data in hexadecimal format
  }
}

Note: Ensure you have the appropriate S.BUS2 decoding library or protocol documentation for advanced telemetry data parsing.

1. Receiver Not Binding to Transmitter:

   • Ensure the transmitter is set to T-FHSS SR mode.
   • Verify that the receiver is powered correctly and the binding button is pressed during power-up.
   • Check for firmware compatibility between the transmitter and receiver.

2. No Signal or Intermittent Control:

   • Check the antenna placement and ensure it is not obstructed or damaged.
   • Verify that the receiver is within the transmitter's range.
   • Ensure there is no interference from other 2.4GHz devices in the area.

3. Telemetry Data Not Displaying:

   • Confirm that the telemetry sensors are properly connected to the S.BUS2 port.
   • Verify that telemetry is enabled on the transmitter and configured correctly.

Q: Can I use the R404SBS-E with non-Futaba transmitters?
A: No, the R404SBS-E is designed specifically for Futaba T-FHSS SR-compatible transmitters.

Q: What is the maximum range of the R404SBS-E?
A: The range depends on the transmitter and environmental conditions but typically exceeds 100 meters in open areas.

Q: Is the receiver waterproof?
A: No, the R404SBS-E is not waterproof. Use a protective enclosure if operating in wet conditions.

Q: Can I expand the number of channels?
A: Yes, additional channels can be accessed via the S.BUS2 port with compatible devices.

This concludes the documentation for the Futaba R404SBS-E. For further assistance, refer to the official Futaba user manual or contact their support team.