Futaba R7308SB S BUS Receiver User Manual

Futaba R7308SB S BUS Receiver

FASSTest12CH(Telemetry OFF）mode

This mode is forcibly turning off telemetry transmission to prevent collision of telemetry signals from the receiver to the transmitter when using dual RX link mode in FASSTest12ch mode.

1. Turn on the receiver. [Transmitter is always OFF]
2. Press and hold the SW for 5 seconds or more.
3. Blinks ORANGE once

How to Dual Rx Link

1. Install two receivers on the aircraft as shown in the connection example.
2. Link the two receivers using the dual receiver feature of the transmitter. For systems without dual receiver capability, link

The transmitter in link mode
For FASSTest 18CH Select dual mode and link primary

A transmitter in link mode

For FASSTest 18CH Select dual mode and link secondary

About telemetry system

• When using the dual receiver function
• The telemetry function of the main receiver can be used
• Sub-receiver telemetry function is not available

Telemetry for FASSTest12CH
In FASSTest12CH mode, after linking R7308SB in telemetry OFF mode, link the receiver you want telemetry too. (The transmitter will show the telemetry of the last linked transmitter.)

Telemetry display of second-linked receiver. Telemetry OFF first-Linked receiver.

Compliance Information Statement (for U.S.A.)
This device, trade name Futaba Corporation, model number R7308SB, complies with part15 of the FCC Rules. Operation is subject to the following two conditions:

1. This device may not cause harmful interference, and
2. This device must accept any interference received, including interference that may cause undesired operation.

CAUTION: To assure continued FCC compliance

1. Any changes or modifications not expressly approved by the grantee of this device could void the user’s authority to operate the equipment.
2. This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body. The responsible party of this device compliance is:
   FUTABA Corporation of America 2681 Wall Triana Hwy Huntsville, AL 35824, U.S.A.
   Phone:1-256-461-9399 FAX:1-256-461-1059 E-mail: service@futabaUSA.com

• FASSTest-2.4GHz Bidirectional Communication System
• Dual Rx Link System Equipment
• S.BUS2 / S.BUS Port and 8 Channels for Conventional System Receiver
• Applicable systems: Futaba FASSTest-2.4GHz system transmitter

Thank you for purchasing a Futaba R7308SB FASSTest-2.4GHz compatible receiver. The R7308SB receiver features bi-directional communication with a FASSTest Futaba transmitter using the S.BUS2 port. Using the S.BUS2 port an impressive array of telemetry sensors may be utilized. It also includes both standard PWM output ports (1-8ch) and S.BUS output ports. The R7308SB can also be switched to the Dual Rx Link System. This system can ensure safety by mounting two FASSTest receivers on one aircraft.

Usage precaution

• Analog servos cannot be used with the R7308SB in the FASSTest 12CH mode.
• Don’t connect to Extra Voltage before turning on a receiver.

WARNING

• Changes or modification not approved by the party responsible for compliance could void the userʼs authority to operate the equipment.
• The R7308SB receiver should be protected from vibration by foam rubber, Velcro, or similar mounting methods. Protect from moisture.
• Keep away from conductive materials to avoid short circuits.
• Antenna installation precaution
• Do not cut or bundle the receiver antenna wire.
• Do not bend the coaxial cable. It causes damage.
• The antennas must be mounted in such a way to assure they are strain relieved.
• Keep the antenna as far away from the motor, ESC and other noise sources as you possibly can.
• Do not touch the antenna to metal, carbon, or other conductive material.
• Be sure that the two antennas are placed at 90 degrees to each other.
• The R7308SB has two antennas. In order to maximize signal reception and promote safe modeling Futaba has adopted a diverse antenna system. This allows the receiver to obtain RF signals on both antennas and fly problem-free.

Antenna installation for carbon fuselage

• You must leave 30mm at the tip of the antenna fully exposed. The exposed antenna should be secured so that it cannot move around or back inside of your aircraft.
• Be careful of connector insertion
• Don’t connect an S.BUS servo / gyro to S.BUS2 connector.

Link precaution

• Do not perform the linking procedure while the motor’s main power is connected or the engine is operating as it may result in serious injury.
• When the linking is complete, please cycle the receiver power and ensure the receiver is properly linked to the transmitter.
• Please power up your system in this order: Transmitter first, followed by the receiver.
• If the R7308SB receiver was previously linked to another transmitter, make sure that transmitter is not operating while linking the receiver to the new transmitter.
• Connector precaution
• Don’t connect a connector, as shown in a before figure.
• It will short-circuit if it is connected in this way. A short circuit across the battery terminals may cause abnormal heating, fire and burns

(Typical installation)

The R7308SBR7308SB has has a port switching switching function. function. If If SB2/4SB2/4 to to SB2/7SB2/7 ports are are also set to S.BUS2, sensors can be connected.set to S.BUS2, sensors can be connected.

• An extra Voltage Port connects with the battery for power, etc. An external voltage input cable of an option is used. The voltage of the battery can be displayed with a transmitter.
• Be sure that when using ESCs regulated output the capacity of the ESC must meet your usage condition.
• Never use dry batteries for the power supply of the R7308SB as they may cause difficulties.
• R7308SB Specifications
• FASSTest-2.4 GHz system(18 ch/12 ch mode)
• S.BUS2 and S.BUS port and 8 channels for conventional system receiver
• Dual antenna diversity Sleeve antenna
• Size: 0.98 x 1.53 x 0.56 in. (24.9 x 38.8 x 14.3 mm)
• Weight: 0.39 oz. (11.0 g)
• Power requirement: 3.7 V to 7.4 V(Voltage range: 3.5 V to 8.4 V)
• Battery F/S Voltage : It sets up with a transmitter
• Extra Voltage port: 0~70 V DC

LED Indication

（ 3 seconds）

Unrecoverable error (EEPROM, etc.)| Red Green

Alternate blink

In Dual RX Link Mode

External receiver is receiving error or not connected.

S.BUS signal not received

| Red Solid
S.BUS signal reception from external receiver

(also received by external receiver)

| Green Solid

In FASSTest12CH Telemetry OFF Mode

Link

FASSTest is a bidirectional communication system between the R7308SB receiver and FASSTest capable transmitters. Multiple optional telemetry sensors may be connected to the S.BUS2 on the receiver and that data is in turn displayed on the transmitter.

Link to the transmitter

1. Bring the transmitter and the receiver close to each other, within 20 inches (half meter).
2. Turn on the transmitter. Place the transmitter into  the receiver linking mode.
3. Turn on the receiver.
4. The receiver will wait for the linking process to begin for 2 seconds. Following that it will return to the normal operation mode.
5. When the LED of the receiver changes from blinking red to solid green, linking is complete. (A link waiting state is ended in 3 second.)

• Refer to the transmitter’s operation manual for complete details on how to place the transmitter into the linking mode.
• If there are many FASSTest systems turned on in close proximity, your receiver might have difficulty establishing a link to your transmitter. This is a rare occurrence. However, should another FASSTest transmitter/receiver be linking at the same time, your receiver could link to the wrong transmitter. This is very dangerous if not noticed. To avoid the problem, we strongly recommend that you double check whether your receiver is really under control by your transmitter.
• If the System Type of the transmitter is changed, the receiver will need to be re-linked to the transmitter.

S.BUS2
S.BUS2 extends S.BUS and supports bidirectional communication. Sensors are connected to the S.BUS2 port.

Compliance Information Statement (for Canada)
This device complies with Industry Canada license-exempt RSS standard(s). Operation is subject to the following two conditions: (1) this device may not cause interference, and (2) this device must accept any interference, including interference that may cause undesired operation of the device. This equipment com-plies with IC radiation exposure limits set forth for an uncontrolled environment. This equipment should be installed and operated with minimum distance 20cm between the radiator & your body.
French: Cet appareil radio est conforme au CNR-210 d’Industrie Canada.

Channel Modes
The R7308SB is capable of changing its channel allocations as described in the table below. This is especially important when using the receiver in a dual receiver mode. See your transmitter operation manual for complete details on operating in the dual receiver mode.
R7308SB CH Mode table

Mode A

CH 1-8

| Mode B

CH 1-7

| Mode C

CH 1-6

| Mode D

CH 1-3

| Mode E

CH 9-16

| Mode F

CH 9-15

| Mode G

CH 9-14

1| 1| 1| 1| 1| 9| 9| 9
2| 2| 2| 2| 2| 10| 10| 10
3| 3| 3| 3| 3| 11| 11| 11
SB2 / 4| 4| 4| 4| S.BUS2| 12| 12| 12
SB2 / 5| 5| 5| 5| S.BUS2| 13| 13| 13
SB2 / 6| 6| 6| 6| S.BUS2| 14| 14| 14
SB2 / 7| 7| 7| S.BUS2| S.BUS2| 15| 15| S.BUS2
SB / 8| 8| S.BUS| S.BUS| S.BUS| 16| S.BUS| S.BUS
LED

blink

| RED 1| RED 2| RED 3| RED 4| RED 5| GREEN 1| GREEN 2

Default

1. Turn on the receiver. [Transmitter is always OFF]
2. Press and hold the SW for 5 seconds to 10 seconds.
3. When the LED of the receiver changes from blinking red to blinking orange, SW is released.
4. The LED should now blink red two times in the patterns described in the chart below.
5. Each press of the SW advances the receiver to the next mode.
6. When you reach the mode that you wish to operate in, press and hold the SW for more than 2 seconds. When LED blinks in green with red, it is the completion of a mode change, SW is released.
7. Cycle the receiver power off and back on again after changing the Channel mode.
8. Turn on the receiver. [Transmitter is always OFF]
9. Receiver enters link waiting state
10. The LED will flash for the current CH output mode.

Dual Rx Link System

By installing two receivers in one aircraft, if one receiver becomes unable to communicate, the other receiver can be operated.

In Dual RX link mode, the SB2/RX port is for reception only, so use CH mode B, C, D, F, G mode for S.BUS output and S.BUS2 input/output.

Connection example

Declaration of Conformity (for EU)
Hereby, Futaba Corporation declares that the radio equipment type is R7308SB in compliance with Directive 2014/53/EU. The full text of the EU declaration of conformity is available at the following internet address: https://www.rc.futaba.co.jp/support/manual/

How to change to Dual RX Link mode

1. Turn on the receiver. [Transmitter is always OFF]
2. Press and hold the SW for 5 seconds or more.

After restarting, the MODE LED lights up.

The external receiver is receiving an error or is not connected.

S.BUS signal not received

| Red Solid
S.BUS signal reception from the  external receiver

(also received by the  external receiver)

| Green Solid

Documents / Resources

| Futaba R7308SB S BUS Receiver [pdf] User Manual
R7208SB-24G, R7208SB24G, AZP-R7208SB-24G, AZPR7208SB24G, 1M23N38310, R7308SB S BUS Receiver, S BUS Receiver, Receiver, FASSTest-2.4GHz Compatible Receiver
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References

• サポート 取扱説明書ダウンロード | 双葉電子工業株式会社 ラジオコントロール

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