User Manual

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).
9XR Pro: Introduction to the Hardware: version 1 7