Telemetry Link X-BUS (Spektrum)

Maybe you want to know the voltage of your onboard battery(s), how many RPMs the motor is turning or the temperature of your ESC. In this day and age R/C is not just one way communication anymore. Traditional radio systems transmit signals from the controller to the receiver, but Telemetry-capable systems send real-time data from your model back to your transmitter. The X-BUS Telemetry Link was developed based on communication protocol disclosed from Spektrum® for use with specific Spektrum® radios and compatible Castle Creations ESC’s. Telemetry data can be displayed on the transmitter screen, or for parameters where you only want to be notified when a defined threshold is exceeded, (battery voltage, ESC temperature, etc.) you can configure a vibration or sound alert from the radio.

Let’s start from the beginning.

What is Telemetry?

By definition, Telemetry is an automated communications process by which measurements (such as speed, temperature, or battery power) are made and other data collected at remote or inaccessible points and transmitted to receiving equipment for monitoring. A telemeter is a device used to remotely measure any quantity. It consists of a sensor, a transmission path, and a display, recording, or control device. Telemeters are the physical devices used in telemetry.

Why should I integrate Telemetry into my models?

Telemetry has the potential not only to improve the safety of our models by monitoring battery voltages, ESC temperature, and other critical parameters, but it also creates other opportunities to get even more fun out of flying because you’ve essentially reduced the risks of “unknown” inevitable crashes. Think of the benefits to be had from alarms that will sound to warn you when there's interference about or if your receiver battery is running unexpectedly low.

Exactly how does the Castle Telemetry Link integrate into my models?

First and foremost, we need to review essential compatibility parameters.

Compatible Castle ESC

The ESC must have the ability to accept a bi-directional communication protocol that gives it the ability to transmit real-time telemetry feedback. This feature is called Link Live™ and needs to be enabled on compatible ESCs using Castle Link™. Click here to view the Castle ESC Compatibility Chart.

Compatible Spektrum Radios

These selected radio’s support bidirectional communication. It is also necessary to utilize a compatible Spektrum Telemetry Module. Click here to view the Spektrum® Radio Compatibility Chart.

Now, let’s see the mechanical integration.

Below is an example of an X-BUS Telemetry Link set-up for Surface, Air and Internal Governor Systems. You can see how the Telemetry Link (about 5.4 inches long) connection is made between the Castle ESC and the Spektrum® X-Bus™ receiver and Telemetry Module/System.

And how about this….there is no requirement for additional Telemetry Sensors for your Spektrum® radio when using the X-BUS Telemetry Link. There are 7 specific data points available* and you can enable/disable to your liking through Castle Link™.

Spektrum® X-Bus Telemetry Link Data Points

Battery Voltage
You will be able to see the voltage state of your battery during flight and respond appropriately to deteriorating conditions or alarms you’ve programmed in your radio.

Battery Current
Reduce the load (throttle usually) to prevent an over-current shut down and know immediately if your consuming too much current in a particular maneuver.

Motor Power Output
This is the percentage of full power your ESC is delivering to your motor.

RPM
Ensure you are within acceptable parameters, without the use of a tachometer.

BEC Voltage
Monitor your BEC voltage and its stability to the RX even under different loads from different servos.

ESC Temperature
ESC temperature monitoring can eliminate a potential thermal shut down.

Battery Ripple
Just how hard are the capacitors, FETS, and internal components working with your set up, excessive ripple can cause internal heating of batteries. Excessive heat is harmful to the components and it can ultimately kill the controller.

Operation of a model aircraft requires your undivided attention. We encourage you to refer to your transmitter manual to configure tactile and/or aural alerts to ensure your safety, and the safety of those around you.

Have confidence in pushing your model to its limits.

Let’s face it, your time and your energy should be devoted to enjoying your craft. Telemetry adds a whole new aspect to the RC pilot or driver that, when set-up and utilized properly, can take a lot of work load away and add to the overall satisfaction and safe operation of model airplanes, helicopters and cars.

You can review compatible Radio’s and much more on the X-BUS Resource page.

Telemetry Link for Spektrum X-Bus Specs

• Size: 25.4 (incl wires: 137.9) x 10 mm
• Weight (circuit board only with no wires): 5.45 g