FrSky DFT Instruction Manual

Instruction Manual for FrSky Two-Way System
1

Introduction

The two-way system developed by FrSky provides not only the normal RC control but also a true telemetry
system to return measurements from the model to the transmitter. This new capability allows for the real
time display of quantities such as altitude, GPS location, battery levels, speed, etc. to the operator.
2

Overview of System Components

2.1 Transmitter modules
2.1.1 Model: DFT
Compatible with the following transmitters:
Futaba: 3PM, 3PK, 7U, 8U, 8J, 9C, 9Z, 10C, FN series, T10C, FC-18, FC-28.
Hitec: Optic 6, Eclipse 7, Prism 7.
WFLY: WFT09, WFT08.
2.1.2 Model: DJT
Compatible with the following transmitters:
JR: 347/388/783/U8/PCM10/PCM10S/PCM10SX/PCM10IIS/8103/J9303/ PX/9XII.
2.1.3 Model: DHT
Installable in almost any PPM modulation transmitter
2.2 Receiver modules
2.2.1
Model: D8R (V2)/D6FR/D4FR
Compatible with FrSky Two Way modules DFT/DJT/DHT/DHT-U
2.2.2 Model: V8FR-HV, V8R7-HV, V8R7-SP, V8R4
These receivers are one-way only but operate with transmitters that are switched to one-way mode.
3

System Features

FrSky's Advanced Continuous Channel Shifting Technology (ACCST SYSTEM) giving a highly
reliable link, especially in high interference environments.
Easy to bind and has instant link-up between transmitter and receiver.
Excellent reboot times.
All channels offer failsafe.
Quick response.
Very smooth servo movement.
Alarms on monitored conditions in the receiver (e.g. low battery voltage, poor reception, etc.)
Error-free link, through the use of a 48-bit CRC algorithm (Data contains error detection bits)
Low power consumption.
True two-antenna diversity.
Firmware upgradable.
4

Function of Two Way Communication

4.1 Two way communication between receiver and transmitter
4.1.1 The receiver is able to accept up to 2 analog inputs, which can be used to monitor battery voltage,
temperature, etc., and transfer the data to the transmitter. Users can set the Alarm Level for each of
these separate analog voltages in the transmitter. The alarms can be programmed to a voltage
above or below a settable threshold or disabled.
4.1.2 The receiver is also able to accept serial data streams from its simple 3-wire RS232 port. Such
information as GPS, altitude, and user-developed data can be transferred to the transmitter without
error. This serial data is then available at the RS232 port on the Transmitter.
4.1.3 Technical data about the protocols are also available at the download portion of the FrSky website.
1
www.frsky-rc.com
28/03/2011