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RC-Interface

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infos

   PPM-encoding

   buddy boxes

 
 

R/C buddy box plugs/ pin assignment

 

For running a R/C transmitter with the R/C Interface the transmitter has to be equipped with a buddy box, that makes the PPM-Signal accessible from outside. Unfortunately, each manufacturer uses its own type of buddy box connector:

 

Multiplex

Futaba

Robbe

Graupner/ JR

 

all

 

DIN female plug 5-pin 45 (180), mating face

GND: 3

Signal: 4

short-circuit 3 with 5

(1: Bat+, 2: Bat+, 5: NC)

 

(DIN female plug 7-pin: additional pins 6, 7 for copying, 5-pin male plug also fits the 7-pin female plug)

 

appropriate male plug for female plug

 

 

 

 

 

Hitec

 

Fokus 4, Eclipse 7, Flash 5, ..

 

 

DIN female plug 6-pin 60, mating face

GND: 0 = shielding

Signal: 4

short-circuit 3 with 5

( 1: Bat+, 2: Signal in, 5: Bat+, 6 : GND)

 

 

 

 

 

 

Jamara

 

Compa x4+1 Trainer

 

DIN female plug 6-pin 60, mating face

GND: 0 = shielding

Signal: 4

short-circuit 3 with 5

( 1: Bat+, 2: Signal in, 5: Bat+, 6 : GND)

 

 

transmitter of model "Calisto"

4 pin female mini DIN plug (without blue contacts)

 

GND: 9

Signal: 3

1+2 trough for plastic pin

 

4 pin male mini DIN connector

 

 

 

Awesome R/C Product by Model Engines

Transmitter E8 of model "Twister CP"

4 pin female mini DIN plug, default colors of the cord

 

GND: 5

PPM Signal: 1

 

 

E-Flite

Transmitter 6-channel CCPM E8 of model "Blade CP", Belt CP

4 pin female mini DIN plug, default colors of the cord

 

GND: 5

PPM Signal: 1

 

9ZAP/9ZHP, FF8/8UAP, FF7/7UAP, FC16, FC18, FC28, ..

DIN female plug 6-pin 60, mating face

GND: 0 = shielding

Signal: 4

short-circuit 3 with 5

( 1: Bat+, 2: Signal in, 5: Bat+, 6 : +5V )

 

 

3PJ, T3PJ, ..

female plug for 3.5 mm mono jack

GND: 1

Signal: 2

 

3.5 mm mono jack connector

 

 

 

 

FX15, FX18, ..

female plug for 2.5 mm mono jack

GND: 1

Signal: 2

 

2.5 mm mono jack connector

 

 

4C, 7C, 9C, FF 4, FF 7, FF 9, T6EXA, Skysport T4YF

female plug, square 6-pin, mating face

GND: 2

Signal: 1

short-circuit 5 with 6

(3: NC, 4: Signal in, 5: Bat in, 6: Bat+)

 

 

 

 

 

Walkera

WK-0701

4 pin female mini DIN plug, default colors of the cord

 

GND: 3

WK-701 PCM Signal: 2

 

Walkera 4-channel

4 pin female mini DIN plug, default colors of the cord

 

GND: 3

short-circuit 3 with 4

UART PCM Signal: 2

connect 2 with 1 temporarily to activate the signal output

or

PPM-Signal: connector for crystal oscillator with crystal unplugged

GND: 3 or charging connector

 

Walkera 22 E (35, 36, 39)

4 pin female mini DIN plug, default colors of the cord

GND: 3

PPM Signal: 2

 

 

Walkera transmitter of model "Dragonfly R7C"

 

PPM-Signal: connector for crystal oscillator with crystal unplugged

GND: other crystal pin or charging connector

 

 

CM-Rex, Terra Top FMSS/PCMS, ..

 

DIN female plug 5-pin 45 (180), mating face

GND: 2

Signal: 1

(3: Bat+, 4: Signal in, 5: Bat+)

 

 

Sanwa

RD8000, RD6000, VG400, VG600, Radiant, Vanguard PPM, ..

 DIN female plug 5-pin 45 (180), mating face

GND: 2

Signal: 3

(4: Bat+, 5: Signal in)

 

 

Stylus, M 11, ..

4 pin female mini DIN plug (without blue contacts)

 

GND: shielding

Signal: 7

1+2 trough for plastic pin

 

4 pin male mini DIN connector

 

 

M Zechs, ..

 

female plug for 3.5 mm stereo jack connector

Signal: 1

GND: 2

NC: 3

 

3.5 mm st. jack connector

 

 

Kyosho

 

Caliber M24 transmitter

female plug, square 6-pin, mating face

GND: 2

Signal: 1

short-circuit 5 with 6

(3: NC, 4: Signal in, 5: Bat in, 6: Bat+)

 

 

FM 314, mc-10, mc-12, mc-14, mc-15, mc-16, mc-16/20, mc-18, mc-20, mc-22, mc-24, FM4014, ..

 

European RF part and buddy box: JR Quattro, JR 9x, X-347, X-387, X-388, X-756, X-3810, ..

 

female plug for 3.5 mm stereo jack connector

Signal: 1

GND: 2

NC: 3

 

3.5 mm st. jack connector

 

 

all MX transmitters with DSC connector: MX-12, MX-16, MX-22, mc-19 (with DSC-connector only)

 

American RF part and buddy box: X-347, X-387, X-388, X-756, X-3810, ..

female plug for 3.5 mm mono jack

GND: 1

Signal: 2

 

3.5 mm mono jack connector

 

 

Micro 47G

4 pin female mini DIN plug (without blue contacts)

 

GND: shielding

Signal: 7

1+2 trough for plastic pin

 

4 pin male mini DIN connector

 

 

 

Spektrum 2.4 GHz

 

DX 7

 

female plug for 3.5 mm mono jack

GND: 1

Signal: 2

 

3.5 mm mono jack connector

 

 

 

 

Lexors

 

 

Nova 4, Nova 6

 

female plug for 3.5 mm stereo jack connector

Signal: 2

GND: 1

NC: 3

 

3.5 mm st. jack connector

 

 

 

T2M

 

transmitter E-Fly

female plug for 3.5 mm mono jack

GND: 1

Signal: 2

 

3.5 mm mono jack connector

 

 

All female plugs viewed from mating face/ outside = view on solder side of the corresponding male plugs; blue bridges are used for deactivation of the RF-part. The RF-part should be switched off in pupil/master mode because no disturbing antenna is plugged into the transmitter and, therefore, the generated energy is not emitted, that can lead to heating and destruction of the RF-part.

 

Your transmitter is not equipped with a buddy box..

.. is not intented to be used in pupil/master mode, but it should be connected to the PC. That is possible anyway, if the transmitter uses PPM. With following steps, one can find out this and can upgrade the transmitter:

  • Choose microphone as input for your sound card. Test the setting with a real microphone.

  • Solder 2 wires at a 3.5 mm stereo jack connector (to contact 1 and 3, see figure of Graupner connector).

  • Plug the cord into the soundcard, open the case of your transmitter and switch it on. Touch the ends of the cord with contacts inside the transmitter. If you hear a buzzing noise that changes while moving the sticks, you have found the signal. Commonly, GND is the negative pole of the battery and PPM signal one of the wires leading from the main board to the RF part.

  • Drill a small hole in the R/C transmitter casing and attach e.g. a 3,5 mm female stereo jack plug at the casing and connect it with GND and PPM signal.

 

Further information:

more detailed information about buddy boxes http://users.belgacom.net/TX2TX/tx2tx/english/tx2txgb1.htm
free oscilloscope program using sound card http://polly.phys.msu.su/~zeld/oscill.html
Experiments with the PC sound card (German) publikationen

 

traced PPM-Signal of Graupner/JR mc22 visualized with Oscilloscope program

hints:

  • Upgrade your transmitter at your own risk.

  • Be careful while seeking the PPM-Signal in the activated R/C transmitter, cause no short-circuits.

  • The self-made buddy box may work well with the RC-Interface, but not in the pupil/ master operation with another transmitter as master. Without further knowledge both transmitters can be damaged.

 

upgrade example 1 - Graupner mc 15

Since a buddy box is offered for mc15, upgrading should be no problem. The PPM-Siganal is detected fast:

A matching self-made buddy box looks like this, the prefabricated parts are easily to get from the direct mail selling or a local electronics store:

The protection resistances are important if a short-circuit happens through a faulty plug.

 

upgrade exampe 2 - Graupner FM 314

A low priced, used FM314 is optimally suitable for flight simulators and for buddy box operation. Unfortunately, the manufacturer doesn't offer any body boxes, however, it can be upgraded easily with the same parts as with the mc15.
There is the FM314 in 2 different versions, that don't differ externally however.

 

v1: used signals are 2 GND and 1 PPM OUT on the transmitter's circuit board

v2: used signals are 1 GND and 4 (or 5) PPM OUT on the transmitter's circuit board, right beside the connections for the axis resistors

 

The signals are connected though the same two resistors with the female stereo jack plug: If the male jack connector is plugged in, its top is connected with PPM-Signal and the middle with GND.

 

 

This is FM314 v2.

On the circuit board right beside the connectors for the axis resistors is the 5-pin row. GND is the most upper pen, PPM-Signal of the 4th. GND is connected through a 100 ohm resistor with the middle contact and the PPM-Signal through 120 ohms with the rear contact of the 3.5 mm stereo jack plug.

 

Distributors wanted: Request retailer's price list

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