Futaba R7201SB FASSTest S.BUS2 receiver

Small and very light Futaba FASSTest 2.4GHz transmission system telemetry receiver with a pair of full-range diversity antennas. It is intended primarily for use in drones and other models using control units communicating via S.BUS or S.BUS2. buses; thanks to its compact dimensions and very low weight, it is also suitable for small aircraft models with S.BUS/S.BUS2 servos and is perfectly suited as a backup receiver in two-receiver operation with other FASSTest receivers. The R7201SB's optional channel modes allow one socket to function as a classic PWM channel output (channel 3)/S.BUS2 or S.BUS port; the second socket has the function of an S.BUS2 port or is used to connect a second receiver in two-receiver operation. The S.BUS2 port for two-way communication enables the connection of S.BUS2 servers, telemetry sensors and other compatible devices. The operational states of the receiver are signaled by an LED indicator.

Transmission system
Futaba FASSTest-2.4GHz with telemetry for flying models (FASSTest 26CH/18CH/12CH).
Note that only digital servos can be used in FASSTest 12CH high repetition rate mode.

Power supply
3.7-7.4 V (nominal voltage), operating 3.5-8.4 V – i.e. e.g. 4-6 NiMH cells, 1-2S LiPo/ Li-ion, 2S LiFe, accumulators, BEC stabilizers power supply in the given voltage range.

Antenna
The receiver is equipped with a pair of diversity antennas in order to maximize signal reception regardless of the relative position of the model and the transmitter. These must be fixed in the model with a mutual orientation of 90°.

Receiver outputs, channel modes
The receiver is equipped with sockets for standard Futaba connectors (with a protrusion), into which you can of course also insert UNI connectors (=JR/Graupner, Hitec) without a side protrusion. >

Channel outputs (PWM/S.BUS): R7201SB allows channel assignment change allowing to use a combination of classic PWM output and S.BUS2 input/output or dual-receiver operation (requires the use of a Futaba transmitter enabling dual-receiver operation). Channel modes are selected using a button on the receiver in a special setting mode – channel modes cannot be changed in normal operating mode.

S.BUS2: The S.BUS2 socket enables the connection of S.BUS2 servos, gyroscopes and other compatible devices and the connection of Futaba telemetry sensors, the data of which can be displayed on the transmitter.

Dual receiver operation with automatic backup
It is also possible to activate the two-receiver mode with automatic backup on the receiver, which automatically switches from the main receiver to the backup receiver (or vice versa) if the signal reception of one of the receivers (a pair of R7201SB or one R7201SB and another FASSTest S.BUS2 receiver) fails. The function is basically the same as that of the FDLS-1 backup system, but you do without any additional equipment.

Telemetry
The R7201SB transmits data about the receiver's supply voltage to the transmitter without the need to connect any sensors.
The R7201SB allows the use of all Futaba telemetry sensors and other sensors compatible with the bi-directional S.BUS2 bus system.

The receiver set includes: R7201SB receiver, user manual.

What is S.BUS2/S.BUS

• S.BUS – Futaba serial bus with one-way communication enabling the control of servos, controllers, switches, gyroscopes and other compatible RC devices connected to a single output port of the S.BUS receiver.
• S.BUS2 - Futaba serial bus for two-way communication allowing (as S.BUS) control of servos, controllers, switches, gyroscopes and other compatible RC devices connected to a single output/input port of the S.BUS2 receiver. In addition, it allows you to connect telemetry sensors and transmit data from them through the receiver for display on the transmitter; from some S.BUS2 servos can transmit information about the operating current, temperature or angle of the servo output lever to the transmitter.

Unlike classic RC kits, the S.BUS(2) system uses serial data communication to transmit control signals from the receiver to a servo, gyro or other device. This data contains commands like "move channel 3 servo to 15 degrees, move channel 5 servo to 30 degrees" for multiple devices. S.BUS(2) devices only execute commands belonging to their own set channel. For this reason, it is possible to connect several servos to the same signal cable, while setting and controlling them individually as needed. The servo identification code (ID) is used for this. You can find the ID on the sticker on the servo box.
The S.BUS2 servo can be connected to the S.BUS2 and S.BUS ports of the receiver. Its function is determined by setting the channel in the servo memory (it is performed using the programming interface of the Futaba transmitter, the SBC-1 programmer or the CIU-3 USB interface with the S-Link PC program - for some servos, the channel can only be set with the help of the transmitter).
An S.BUS or S.BUS2 servo connected to the channel output of a classic receiver (PWM) works like a classic servo. Its movement is given by the signal in the channel of the receiver to which it is connected. The settings of the programmable servo functions remain in effect.