Trainer Port Connections

On the top rear side of the radio are trainer cable connection ports for both JR and Futaba cables. The Futaba port is also used for connecting the FrSky telemetry cable from the FrSky DJT module. This cable is not supplied with the radio or module and must be purchased separately.

Front View

Telemetry Basics

Telemetry means that values read by sensors in the aircraft can be sent by the receiver back to the transmitter. Signal strength and battery voltage are the most common parameters reported, but a wide range of other possibilities includes GPS coordinates, fuel level, motor temperature, rate of climb/descent, and current. The signal carrying these data is received by the module and either used to trigger an alarm when necessary or announced over the speaker or headphones (data may also be displayed on-screen, but this is not very helpful to the pilot, whose eyes are on the model). The data may also be logged on the SD card and reviewed later.

FrSky Telemetry

The only telemetry system compatible with the 9XR Pro and with open source firmware such as Ersky9X is currently FrSky. To use this you must have a telemetry-capable FrSky transmitter module (DJT or XJT) and an FrSky telemetry-capable receiver (D-series or X-series). Relaying the full set of telemetry signals from the FrSky module into the 9XR Pro radio requires a cable that can be purchased to connect the four pin socket on the back of the FrSky DJT and XJT modules to the Futaba Trainer port on the 9XR. Alternatively, a DJT module can be modified internally to avoid the need for a cable (detailed instructions are available in Appendix A). The cable (top) has a second lead to allow a trainer cord to be connected at the same time as the telemetry cable. This may be removed if you don't want it. The photo above above shows a DIY installation. The DJT module, or an XJT module in D8 mode, when used with a D-series receiver will output all hub sensor data via the serial port. The display of the received data and its format is determined by what you specify in the telemetry screens in the Model Setup pages. There are two pages, 10/13 and 11/13 where pre-formatted and customisable screens for information can be found. For a detailed explanation of the various sensors and all other things related to FrSky telemetry, please refer to the FrSky Telemetry Wiki