User Guide

Specification for Spektrum X-Bus Telemetry Sensors
Page 1 Rev E
Specification for Spektrum
®
X-Bus Telemetry
Sensors
1 INTRODUCTION
With the advent of third-party display (J-Link), annunciation (vSpeak), and data display systems
(Robo-Software), we feel it is in everybody's best interests to open the telemetry system by sharing
correct implementation data. With that mindset, the purpose of this document is to enable third-party
telemetry sensors, both commercial and hobbyists, that can use the Spektrum X-Bus telemetry system
as a data transport mechanism for custom sensors including items such as:
• an ESC,
• fuel flow meter,
• high-current battery “fuel gauge” (mAh),
• digital status (for example, landing gear status lights),
• thrust/strain gauge,
• air tank pressure, or
• an individual cell monitor for LiPo batteries.
The intent is that publication of this document will ensure that these third-party devices can inter-
operate with one another and with Spektrum products in a non-interfering, cooperative manner.
Spektrum will provide an interface to allow generic data display and alarms on certain levels of
transmitter products, although they obviously cannot be as thoroughly integrated into the radios as
Spektrum products are.
2 AUDIENCE
This document is intended for non-Horizon personnel to be able to develop sensors which function
correctly in the Spektrum X-Bus Air Telemetry System. This document includes sufficient information
to allow a sensor to be created such that it reports data useful to the users.
This document does not provide information that can be used to access data contained in a Spektrum
telemetry file (.TLM). The STi application provides this capability for Apple iPhone and related
products. Robo-Software has developed a Windows- and Mac-based shareware product which
provides excellent capabilities for post-flight data analysis.
3 RELATED DOCUMENTATION
All necessary technical information is contained within this document, including diagrams and source
code guidance.
4 LEGAL INFORMATION