FrSky X8R Pinout. In this receiver pinout article, we will be checking the FrSky X8R pinout. We are also going to see how each pad works in more detailed way and which do you have to use for your aircraft. Let's see first a small overview about this receiver.

The X8R is a small 8 channel receiver but it is more capable compared to older 8 channels receivers. It supports Smart Port that handle newer sensors as well as old ones, this receiver also supports 8 PWM outputs, as well as 16 channels when using the S.BUS protocol which we will see later how to wire them up in this FrSky X8R pinout.

In addition to this, it is also possible sync the PWM channels 1-8 and the channels 9-16 by using two X8R receivers in combination. When the receiver is bound in D8 mode, it can be compatible with the DHT, DJT, DFT and DHT-U transmitter modules.

FrSky X8R Pinout

The FrSky X8R pinout may seem a bit messy at first, but it is very simple although some pads can lead to misunderstandings, so let’s start checking every pad. In the next diagram is represented the FrSky X8R pinout.

⦁    S.PORT: The first pad of the FrSky X8R pinout we are checking is the S.PORT pad “S“. This pad is made for the S.Port protocol. The S.Port or Smart Port is a two-way full duplex transmission of telemetry protocol used by FrSky which allows you to get the telemetry information of the model such as battery level, RC signal strength, etc. But also, it allows you to connect other sensors which you might need for your aircraft.

In flight controllers it has to be connected to the TX pad of a free UART and it also needs to be set up in the flight controller configurator. Most F4 flight controllers won’t be compatible with S.Port  because in this receiver there isn’t any un-inverted S.Port output.

⦁    The GND pads: The next pads of the FrSky X8R pinout we are checking are the GND pads “-”. These pads are placed all over the receiver and connected with each other, we can distinguish the pads between the GND for power which have to be connected to a GND pad, the negative, of the source from where it is being powered, it is usually recommended to find a voltage regulator in the flight controller and connect both GND pads together.

Other GND pad found in this FrSky X8R pinout is for example the one of the S.Port 3 pin connector, which also has to be connected to the sensors you are going to use, or to a flight controller if you are not powering the receiver from it. It is also necessary to connect the GND pads in the PWM outputs to each corresponding servo etc. or to the SBUS GND if you are using it instead. Finally, in the GND connections, it is also required to connect a GND to the RSSI output if you want to use it.

⦁    The Voltage pad: This pad of the FrSky X8R pinout “+” is a voltage input and output used to power the receiver and the peripherals connected to it, it can take from 4V up to 10V. It is recommended to connect it to a 5V power supply as many hardware such as servos usually only work on 5V.

It is important to take in mind that it is necessary to use only one “+” input of the FrSky X8R pinout connected to any pad for supplying to the other pads of the receiver. This power supply will must be powerful enough to manage current loads.

⦁    CH1-8: This are PWM analog outputs, in this FrSky X8R pinout each channel corresponds to the pad with its number written. For this reason, this receiver can be used also in models that doesn’t require any type of processed signal, mostly any airplane that doesn´t need any type of stabilization mode.

⦁    RSSI: This means “Received Signal Strength Indicator” measured in decibels (dB), between the couple of a paired receiver and transmitter and is used to avoid failsafes, the value can be casted to the transmitter, so you are able to know the value almost instantly from ground.

⦁    SBUS: The last pad of the FrSky X8R pinout is for SBUS, a digital communication protocol which can be used in this receiver. It supports to transmit up to 16 channels and all the signal information can be sent by one cable which can send as many signals as channels have the transmitter. This is quite beneficial for aircrafts with flight controllers to the user comparing it to PWM, which needs a dedicated output for each channel. The downside of this is that you need something to decode the signal to have individual channels such as the already mentioned flight controller.