RadioMaster R81 User Manual

English

Receiver Specifications:

Channels: 8
Frequency range: 2400-2483.5Mhz
Power input range: 4.5-8.4V
Signal format: D8
Output format: SBUS
Support return: support return RSSI
Control distance: more than 1km
Antenna length: Approximaltly 6cm
Size: 17x11mm
Weight: 2grams

BIND Method

1. Press and hold the BIND button on the receiver then connect power. After approximately 3
seconds, the receiver LED will be RED, the receiver is now in bind mode.
2. Select the D8 protocol for the multi-protocol menu of your remote control, and press the
[BIND] option, the red light of the receiver will flash indicating successful bind.
3. Exit bind mode on your remote control and disconnect power to the receiver then power the
receiver once more. The LED will now be solid RED indicated the bind is now done. If not
please repeat step 1 and 2.

Fail-Safe Protection

1. Press the BIND button once within 10 seconds of the receiver being powered on, and the
receiver will save all the current channel values of the remote control as the fail-safe value.
2. 10 seconds after the receiver is powered on, the BIND button function will be disabled to
prevent accidental changes to the fail-safe settings while preparing the model for flight.
This receiver has a total of 9 SBUS channels (Sbus has 8 control channels + 1 RSSI channel).
Channels 1-8 are controlled by the remote controller, the 9th channel is the signal strength RSSI
value output by the receiver, which can be read by various flight controllers and sent to the OSD
to Show signal strength in the FPV video feed.
R81 Receiver User manual
S.BUS DC4.5-8.4V
GND