FUTABA R304SB-E - User Manual

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Link Pr o c e d u r e

Each transmitter has an individually

assigned, unique ID code. In order to start

operation, the receiver must be linked

with the ID code of the transmitter with

which it is being paired. Once the link is

made, the ID code is stored in the receiver

and no further linking is necessary unless

the receiver is to be used with another

transmitter.

Plac e the transmit t e r a n d the

receiver close to each other within

half (0.5) meter.

Place the transmitter into the linking

mode, and turn on the receiver.

During countdown, push the receiver

tact switch for approximately 2

seconds. The LED will begin to blink

red. After the receiver LED switches

from blinking red to green

→

red

steady light, If the transmitter and

receiver are linked normally, set the

power switch to the OFF position

and then turn on the PWR ON

position. If the receiver LED lights

green, linking was succeeded.

Actually check servo operation.

* Please refer to the table below for

LED status and receiver condition.

* Refer to the transmitters operation

manual for complete details on how to

place the transmitter into the linking

mode.

* If there are many T-FHSS systems

turned on in close area, your receiver

might have difficult in establishing a

link to your transmitter. This is a rare

occurrence. Your receiver may link to

the undesirable transmitter. This is

very dangerous if you do not notice

this situation. In order to avoid the

problem,we strongly recommend

yo u double c h e ck whether yo u r

receiver is really under control by your

transmitter.

WARNING

After the linking is done, please cycle receiver power and check if the receiver

to be linked is really under the control by the transmitter to be linked.

Do not perform the linking procedure with motor's main wire connected or

with the engine operating as it may result in serious injury.

Link switchLED

S.BUS2 / (Battery)

CH output

(1 to 4) / (Battery)

Operating Precautions:

Once the

R304SB-E

detects the

T-FHSS

normal mode

T-FHSS high

speed mode

, the detected mode is

locked as long as the power is ON.

When need to change the mode,

please cycle power.

Note:

The R304SB-E is compatible with the T-FHSS system

transmitters.

The receiver type setting of the transmitter is set T-FHSS.

*Futaba T-FHSS system does not work with current Futaba S-FHSS/FHSS/FASST-

est/FASST system.

Us a g e c o n di t i on on " High Speed m ode "

CAUTION

When using the high-speed mode, use a Futaba digital servo (including

brushless servo). Analog servos cannot be used.

• The use of analog servos may cause servo trouble.

1M23N28504

T-FHSS-2.4GHz System

S.BUS2, 4-Channel

Built-in Antenna Receiver

for EP Car Models

Thank you for purchasing the

R304SB-E

receiver. The

R304SB-E

is designed for use

with the Futaba

T-FHSS

system transmitter.

The

R304SB-E

receiver has adopted the newly

developed bidirectional communication

system "

T-FHSS

•Telemetry system

With the

tel emetry s ystem

, the running

status can be displayed at the transmitter.

The telemetry data can be checked at the

transmitter by connecting the

telemetry sensor

sold separately to the

S.BUS2

connector of the

R304SB-E

receiver.

•Normal mode/High Speed mode

The "Normal mode" accepts any type of servos

or the peripheral. The "High Speed mode"

only accepts the digital servos, including BLS

series, and most peripheral equipments such

as the brushless ESCs. Please pay special

attention to the information contained within

this manual and transmitter's manual in order

to have a pleasant running experience.

•Built-in antenna

The

R304SB-E

receiver is designed to be

used only for EP Car models.

R304SB-E

WARNING

NEVER use dry batteries for

the power supply of the R304SB-E

as this may cause difficulties with

the receiver's operation.

NEVER use the R304SB-E in GP

(Engine) cars.

W r a p t h e r e c e i v e r w i t h

something soft,such as foam

rubber,to avoid vibration. Do not

splash water over the receiver.

Since the receiver generates a

certain amount of heat, install

the place with good ventilation.

No signal recep-

tion

LED: Red

Receiving signals LED: Green

Unrecover-

able failure

(EEPROM,etc.)

LED: Red

and Green

turn on alter-

nately

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Summary

R304 SB-E Receiver Overview

Telemetry System Capability

Enables display of running status and data via telemetry sensors connected to the S.BUS2 connector.

Normal and High Speed Modes

Supports standard servos or digital servos/BLS/ESCs for enhanced performance and compatibility.

Built-in Antenna Design

Receiver features a built-in antenna and is designed for EP (Electric Powered) car models exclusively.

Receiver Linking and Operation

Transmitter-Receiver Linking Procedure

Step-by-step guide to pair the receiver with the transmitter's unique ID code for initial operation.

Operational Safety Warnings

Includes precautions against linking with motors connected and verifies receiver control after linking.

High Speed Mode Servo Compatibility

Recommends using only digital servos (including brushless) in High Speed mode to prevent servo trouble.

Connection Example and Specifications

Example Connection Diagram

Illustrates how to connect the R304SB-E receiver to ESC, steering servo, and telemetry sensors via HUB.

R304 SB-E Technical Specifications

Details system type (T-FHSS), channels, frequency band, receiving range, power requirements, and physical dimensions.

The Futaba R304SB-E is a 2.4GHz T-FHSS S.BUS2, 4-channel receiver specifically designed for use with EP (Electric Powered) car models. It operates on the Futaba T-FHSS system, a newly developed bidirectional communication system that allows for telemetry data transmission.

Function Description:

The primary function of the R304SB-E is to receive control signals from a compatible Futaba T-FHSS system transmitter, enabling the operation of various components in an EP car model. It features four channels for controlling functions such as steering and motor speed. The S.BUS2 port allows for the connection of multiple servos and other peripheral devices with a single cable, simplifying wiring.

A key feature of this receiver is its integrated telemetry system. By connecting optional telemetry sensors (e.g., temperature, RPM, voltage sensors) to the S.BUS2 port via a HUB, users can monitor the running status of their car model directly on the transmitter. This provides valuable real-time data for optimizing performance and preventing potential issues.

The R304SB-E supports both "Normal mode" and "High Speed mode." In "Normal mode," it is compatible with all types of servos and peripheral equipment. "High Speed mode," however, is designed for use with digital servos (including BLS series) and most brushless ESCs, offering faster response times. The receiver automatically detects and locks into the appropriate mode (Normal or High Speed) once power is applied.

Usage Features:

Linking Procedure:

To establish communication between the receiver and a transmitter, a linking procedure is required. Each transmitter has a unique ID code, which the receiver stores after linking. This process needs to be performed only once per transmitter.

Place the transmitter and receiver within 0.5 meters of each other.
Put the transmitter into linking mode.
Turn on the receiver.
During the countdown, press the receiver's tact switch for approximately 2 seconds. The LED will blink red.
Once the LED changes from blinking red to green, then to a steady red light, the linking is successful.
Turn off the power switch and then turn it back on. If the receiver LED lights green, linking was successful.
Always verify servo operation after linking.

LED Status Indicators:

The receiver's LED provides visual feedback on its status:

Red: Indicates no signal reception.
Green: Indicates receiving signals.
Red and Green (alternating): Signals an unrecoverable failure (e.g., EEPROM error).

Mode Switching:

The R304SB-E automatically detects and locks into either "Normal mode" or "High Speed mode" based on the connected components and transmitter settings. To change the mode, the receiver's power must be cycled (turned off and then back on).

High Speed Mode Caution:

When operating in "High Speed mode," it is crucial to use only Futaba digital servos (including brushless servos). Using analog servos in this mode can lead to servo malfunction.

Safety Precautions:

Power Supply: Never use dry batteries to power the R304SB-E, as this can cause operational difficulties.
Engine Cars: The R304SB-E is exclusively for EP car models and should not be used in GP (Engine) cars.
Linking Environment: Avoid performing the linking procedure with the motor's main wire connected or with the engine operating, as this may result in serious injury. If multiple T-FHSS systems are active in the vicinity, there's a rare chance the receiver might link to an unintended transmitter. Always double-check that your receiver is controlled by your transmitter after linking.

Maintenance Features:

Vibration and Moisture Protection:

To ensure reliable operation and longevity, it is recommended to wrap the receiver in a soft material, such as foam rubber, to protect it from vibrations. Additionally, prevent water or other liquids from splashing onto the receiver.

Ventilation:

The receiver generates a certain amount of heat during operation. To prevent overheating and ensure optimal performance, install the receiver in a location with good ventilation.

The R304SB-E is a high-voltage system (HV), designed to handle higher input voltages, offering flexibility in power source selection for EP car models. Its built-in antenna design further simplifies installation and reduces clutter.