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Chapter 6: Radio-Controlled Systems and Telemetr y 157

Figure 6.25 The DX-8 LCD showing real-time telemetry.

The r/min reading is low because I did not properly configure either the number of
poles or the preset ratio in the telemetry setup menu. It should be approximately 4100 r/min
instead of the 1216 number shown in the figure. The temperature reading is the ambient
temperature around the setup, and the voltage is the LiPo's battery level powering
everything.
A four-pin socket labeled as X-BUS is visible in Figure 6.23 next to the BIND switch.
Figure 6.26 is a close-up photo of this socket clearly showing the four pins. This socket was
designed by Spektrum to allow these additional sensors to be attached to the TM1000:

• G-Force three-axis accelerometer (low range—up to 8 g’s)
• G-Force three-axis accelerometer (high range—up to 40 g’s)
• High Current sensor
• Airspeed
• PowerBox
• JetCat

Each of the sensors listed above comes with an extension cable that is plugged into the
X-BUS socket. Each sensor also has two sockets allowing for a daisy chain to be formed if

Figure 6.26 The X-BUS socket.