FrSky DFT, DJT, DHT, D8R, D8RV2 Instruction Manual

www.frsky-rc.com

28/03/2011

Instruction Manual for FrSky Two-Way System

1 Introduction

The two-way system developed by FrSky provides not only the normal RC control but als o 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

z FrSky’s Advanced Continuous Channel Shifting Technology (ACCST SYSTEM) giving a highly

reliable link, especially in high interference environments.

z Easy to bind and has instant link-up between transmitter and receiver.
z Excellent reboot times.
z All channels offer failsafe.
z Quick response.
z Very smooth servo movement.
z Alarms on monitored conditions in the receiver (e.g. low battery voltage, poor reception, etc.)
z Error-free link, through the use of a 48-bit CRC algorithm (Data contains error detection bits)
z Low power consumption.
z True two-antenna diversity.
z 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.

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5 Specifications

5.1 Receiver specifications

Model: D8R (V2)
Number of Channels: 8
Weight: 16.2g
Dimension: 54*27*17mm (2.13” x 1.06” x 0.67”)
Operating Voltage Range: 3.5V-10.0V
Operating Current: 100mA
Specified Range: 1.5km (Ground Range)
Resolution: 3072 (>11bit)
Switchable Frame Rate: 18ms (FS) for analog servos or 9ms (HS) for digital servos
Built-in battery voltage sensor: Sent on A1 analog channel to transmitter
Analog input voltage (A2): 0~3.3V from user supplied sensor
Upgradable firmware without opening the receiver case

Model: D6FR
Number of Channels: 6
Weight: 7.1g
Dimension: 42*22*11mm (1.65” x 0.87” x 0.43”)
Operating Voltage Range: 3.5V-10.0V
Operating Current: 50mA
Specified Range: 1.5km (Ground Range)
Resolution: 3072 (>11bit)
Switchable Frame Rate: 18ms (FS) for analog servos or 9ms (HS) for digital servos
Built-in battery voltage sensor: Sent on A1 analog channel to transmitter

5.2 Transmitter module specifications

Model: DFT, DJT, DHT
Operating Voltage Range: 6.0V-13.0V
Operating Current: 50mA
Output Power: 60mW
Resolution: 3072

The effective range of control refers to the distance between the transmitter and the receiver. All
data was tested and verified by FrSky. However this is not guaranteed due to many factors
such as the flying environment and the weather, which can greatly affect the effective range of
control.

It is extremely important to range check your models prior to each flying session!

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28/03/2011

Important!

6 How To Use

6.1 Setup

6.1.1 Installation of the transmitter modules:

6.1.1.1 Remove the original transmitting module.

6.1.1.2 Ascertain that the transmitter is set to broadcast PPM and not PCM. Turn off the transmitter.

6.1.1.3 Put the FrSky 2.4GHz transmitter module into the module port of your RC transmitter and screw on

the transmitting antenna. The DHT module may be internally installed in the transmitter.

6.1.1.4 Check the MODE switch to its corresponding position.

6.1.1.5 Turn the transmitter power on and check the LED status on the module. Normal operation on the

transmitter is indicated with the RED LED on and the GREEN LED flashing.

6.1.2 Installation of receivers:

Mode Switch 1 Switch 2 Mode

1 OFF OFF Two-way Mode
2 OFF ON V8 Mode
3 ON OFF Not Defined
4 ON ON Firmware Upgrade

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