Version 2.0 Beta 7

Copyright © 1999-2001 Michael and Roman Möller

Translation: Mike Roberts

Table of contents

System demands
FMS needs an IBM-PC or a 100% compatible computer with at least 300 MHz clock frequency.
Operating system:
So that FMS runs on your computer, an operating system Windows 9x/Me/2000 with DirectX 7.0 (or later) must be installed. (Download DirectX from
Graphic card:
The graphic card must support 3-D-acceleration with DirectX.
You can control FMS either with the keyboard, with a joystick or with your own remote control. For the operation with a remote control you need a free parallel or serial interface which can be driven in interrupt mode, and fit an interface.
FMS supports all DirectX compatible sound cards.

Use of own remote control with FMS
Connection of a remote control to a Parallel port
For the following contributions we would like to warmly thank the respective authors. Only through a wide range of the connection descriptions is the Parallel port Interface System of FMS of use. If you know a Pin-allocation not yet specified here or connection circuit, we would be grateful for a short description. Neither we nor the authors of the following contributions take any liability what so ever for any losses in computer, interface or remote control or secondary damages of any sort.
The instruction manual of Harald Sattler
I have suggested Michael to make a simpler option, to use a remote control as a controller for FMS, as the adapters suggested so far are based on complicated conversion of the remote control signals to a gameport-compatible signal or by opening the transmitter.

The basic idea is to connect the remote control transmitter simply to a PC.
If the transmitter:

1. Uses PPM-MODULATION (or it can be selected)
2. Has a "buddy-socket"

One only needs a Parallel port socket (25 pin Sub-D, male(pins)), a plug which fits in the buddy-socket of the remote control transmitter, approx. 2 meters lead in order to connect the remote control transmitter to the PC printer socket, as well as a resistance and a zener diode.

The diagram looks as follows:
   A )------------------| 680 Ohm |---------*--------------------( Pin 10
                        +---------+         |
    Buddy socket                             /                Parallel-
    on transmitter                          /\    ZPD 4v7     Port on
                                           /  \               PC
   B )--------------------------------------*--------------------( Pin 18

The ring of the zener diode must point to the resistance. The connections A and B are different from remote control to remote control. With the ruther old radios "Robbe Terra top" and the "Robbe Luna", there are (in a "normal" 5-pole DIN plug) the following Pins:

                2           viewed from the front on the plug, one sees
                o           the pins within a round screen
          5 o       o 4
                            (the plug I have has stamped
         3 o         o 1     numbers)


    A is to be connected with Pin 1 (signal)
    B is to be connected with Pin 2 (ground)
    the screen is not connected

A clever feature of these remote controls is if Pin 3 and Pin 5 are connected. If one connects these two pins in the DIN plug with a wire bridge, the digital coder part is turned on while the plug is in the transmitter but the HF-part is not supplied with power. If one has this type of transmitter one is lucky that no provision is required to prevent the HF-part from damage by operation without aerial. Also, the power consumption is much smaller without the HF-part.
If ones transmitter does not have such a connection , it is advisable to disable the HF-part by pulling the crystal while using with FMS.

Still two other transmitters were available to me: a Robbe / Futaba Skysport of 4 newer dates (bought 1997) and a Robbe 4-channel-arrangement of 1995 the names I do not know. These two enclosures have in each case a 6-pole plug for the Buddy connection. The allocation is as follows:
                3           views from the front on the plug, one sees
                o           the pins within a round screen
          2 o       o 4
                o           (the plug I have has stamped
          1 o   6   o 5     numbers)


    A is to be connected with Pin 4 (signal)
    B is to be connected with screen (ground)

(For the numbering of this sort of plug I do not want to take a risk, because this time there is nothing on it. If one considers, however, the plug from the front, also the cable of itself turns away, then it is the pin labled pin 4 in the picture above)
(To whom it interests: in both of these newer Robbe/Futaba-arrangements Pin 4 is the exit in the "pupil's-transmitter". In the teacher's-transmitter" this signal must be fed in Pin 3. Then with this one has a reasonable buddy-cable for these transmitters.
With the TerraTop or Luna there is no buddy socket, but a plug is available to be able to operate the Servos " on the ground " without HF-radiation. For this purpose was enclosed a cable which has a 3-pole "Servostecker" at the other end which was put in a special entrance of the receiver. But this, only by the way...)

If the allocation of the pins in the buddy-socket is not known, the user must ask either the allocation from the manufacturer or find a model construction trader who you can trust or measure by means of an oscilloscope. The pin on which one sees a rectangle signal with respect to ground with a period duration from approx. 1.5ms corresponds to connection A.

For whom the "circuit" design calculations interest:
I have assumed that a transmitter with 8 NC-cells is used. If these 8 cells are quite charged, with good cells in transmitter an operating voltage of no more than approx. 11 volts (1.34 volts per cell) is seen. Then after few minutes operation the voltage will fall to approx. 9.6 volts. Then according to Ohms law (V=R*I) the resistance can be found >from (11V-4,7V) =R*0,01A Using the worst case with 10 mA of current across the zener-diode - > R=630 ohms calculated. The closest higher standard value is 680 ohms. Then the current will adjust itself in the worst case (battery fully charged) to 9.2 mA. The resistance will generate power of W=V*I - > P~58mW , so one can use normal 100mW type.
The purpose of the zerer-diode is to limit the input voltage to the Parallel port to a maximum value, which cannot do damage. Because the Parallel ports work commonly with TTL-levels, also with values of small 5 volts, here we use 4,7 volts to be on the safe side.
This consideration is applied to the case that the signal in the exit of the buddy-socket has a value of greater than 5 volts. If the signal is smaller, the voltage-limiting influence of the zener-diode disappears. In this case the sensitivity of the Parallel port input is the critical point. With the Parallel ports accessible to me (two Multi-IO-Karten and an Onboard-interface on an ASUS Motherboard) a voltage swing of 0,9 volts above zero has been sufficient to make the test programs of Michael work. However, the probability that the signal in a buddy-socket being so low level is relatively small, because with it the sturgeon voltage distance falls in critical areas. One considers at least one HF-transmitter in direct nearness with, that in the doubtful case approx. 1 watt of radiated power, and, nevertheless, no disturbances in the buddy-cable einekoppelt may become (is this why Graupner recently used optical fibre cable for the connection of both transmitters?).
The area of the permissible operation for our adapter lies between approx. 1 volt and 11 volts for the buddy-output signal.
As to the polarity of this signal we need to do not have to bother, this has already taken been taken into account for us by Michael in his brilliant program.

To whom this whole description means nothing or who does not know which part is the hot end in a soldering iron, he can let help in the building (and if necessary in the initial start-up) the circuit of somebody who knows electronics.

Needless to say that I can take no guarantee for the fact that the described circuit will work with every combination from remote control transmitter and PC. Simmilarly I cannot guarantee that, nothing gets broken. After Adam Riese can actually with neat construction (no short circuits, no connections exchanged) nothing pass, after Murphy again just EVERYTHING will happen and Murphy has got nothing, luckily, evidently from my attempts). Everone must realize that the described way of the connection of his remote control transmitter with the PC is not as original design and is not covered by any guarantee. Who does not want to take this risk, should make way on one of the circuits stated by Michael.

Harald Sattler, June, 1999

Supplement for the transmitter Robbe Starion and Hitec Flash 5
I have just received another remote control in my hand. A Robbe Starion, 4 channels, no extension possibilities, no buddy-socket:-((
However, this is my fathers the remote control and I want with him to learn to fly his electric sparrow this summer, I thought, there must be a way...

Done thinking, with the case opened, I see, this enclosure has a HF-module which can be removed without tools. The connecting pins can be easily checked (oscilliscope) on which Pin the digital signal lies, ground pins were also found quickly. The digital signal surprisingly corresponds to my needs, also 9 V of signal amplitude. I quickly equip the adapter plug for the Parallel port with resistance and zener-diode, a long enough, 2-pole cable in between, screen in Pins 2 and 3 of a 5-pole Wirewrap-plug, core of the cable in Pin 5, there is is done.

The diagram in addition looks as follows:

   A )------------------| 680 Ohm |---------*--------------------( Pin 10
                        +---------+         |
    Connector                                /                Parallel-
    between Digital                         /\    ZPD 4v7     Port on
    and HF-part in                         /  \               PC
    transmitter                           ------
   B )--------------------------------------*--------------------( Pin 18

The ring of the zener diode must point to the resistance.

Look in the opened, transmitter lying on its back :

    | housing from inside ("front")
    |                               connection pins to the HF-part
    |                               +---------+
    |   ----------------------------|o o o o o|-       (here on the right is
    |   ----------------------------------------        usually
    |    Digital board               1 2 3 4 5          HF-parts)

    A to Pin 5
    B to Pin 2 and / or Pin 3 (are connected on the board anyway)

To the plug in the transmitter I have now applied a Wirewrap-connection. These plugs consist of square pins, approx. 0.8 mms thick which are mounted side by side into a plastic header and are lined up 2.54 mm appart. From the board 5 pins are nipped off shortened to approx. 12 mm (the pins are approx. 20 mm long originally, both measured from under the plastic header) and the cable is soldered above the plastic header. The cable can be led for the operation of the transmitter with FMS e.g., by the hole where at the crystal usually sits. The HF-part is disconnected anyway, so we do not need to consider disabling this.

Now quickly fix the settings for the Port address and Interrupt and off we go.

No problems:-))

And still more information:
I briefly had a Hitec Flash 5 remote control. This has a buddy-socket again and can be connected with the Robbe / Futaba Skysport 4 as a buddy-combination (for allocation of the Pins in the plugs see above). The information to the operation as an input device for FMS to the Skysport 4 applies 1:1 to the plug allocation the Flash 5.

Harald Sattler, July, 1999

Supplement for the transmitters Europe MPX sprint and Graupner FM 314
Here is the arrangement of the connecting lead by use of Europe MPX sprint transmitter. (Would have to function with all MPX transmitters.)

Top view on socket in the transmitter:
1 = battery +
2 = + if turned on
3 = battery -
4 = signal
5 = if connected to 3, no HF radiation

Graupner FM 314 transmitters can also be used, but with a small extra circuit (Then also as a pupil's transmitter with MC 18/20/24). On the board in the transmitter there is a connector (3 Pins) in the middle below. There a GR-Servo cable is attached so that the orange connection points to the left with the open transmitter and the aerial pointing away. The lead can be made with components soldered to a 3.5mm stereo jack socket and with the zener diode in the Sub-D-plug.

Bernd Hagen, November, 1999

Supplement for the transmitter FM-SS PROFESSIONAL 7/14
Connection of the remote control FM-SS PROFESSIONAL 7/14 in the Parallel port of the PC's for the operation with FMS:

Material: Unfortunately, FM-SS PROFESSIONAL 7/14 possesses neither a connection for a buddy cable nor a connection to the " Sendelosen testing ". In the manual I found where the HF-module connection is. (If I remember correctly, one could acquire for this remote control HF-modules for different frequency bands). Now, I see my module is fastened not only by the connection, but in addition with 2 screws.

This is how I have built it:
Open the rear remote control lid (not just the inset black plastic lid.)
The module HF is in the middle of the remote control board. Remove the HF module.
Now on the board a 5-pole connector (male) should become visible. (see picture 2). See diagram 1 and picture 2. Solder the two wire cable to the appropriate pins.
Take care the distance to the remote control lid is rather small. Therefore bend the high contact pin in the plug and whole well insulated.
At the connection, a Perspex piece is fitted (at least with me) just here of the connection in the lid, with could open or close, however, one could produce a short circuit.... (You know) the cable can be taken out easily via the plastic lids oprning of the lid.
Because the connection described above is a little insecure I have taken the cable for the Steckverbindung via the upper carrying handle of the remote control. Close lids:-).
Have accommodated the "circuit" in diagram 1 within the parallel plug.
Two words more: this remote control has a field strength meter. Because with the HF-module removed nothing more is sent, the announcement should stop in the "computer entreprise" on zero. The described circuit functions still if the battery test stands for a long time in the red area.

Why a Revision of the Resistance Values?
My transmitter is fitted out with 9 NC cells. Particularly therefore it is advisable to increase the resistance of the suggested interface. To come to a safe current of < 10 mA, I have calculated a resistance of approx. 733 ohms. The next standard value is 750 ohms, 1/8 watt is sufficient. (resistance and zener-diode are meant here only of protecting the remote control or the transmitter in case of a false connection. However, here with the low price of perhaps 2 DM I would not really avoid using)
I have seen on the board with the Anschlusstelle battery / fernsteuerungsplatine which can be used the transmitter probably also with normal batteries. In this case one could use perhaps for security reasons still a bigger resistor...

 The diagram 1 looks as follows:

   5 )------------------| 750 Ohm |---------*--------------------( Pin 10
                        +---------+         |
    HF-connection-pin                        /                Parallel
    in the transmitter                      /\    ZD 4v7      Port on
                                           /  \               PC
   2 )--------------------------------------*--------------------( Pin 18

Picture 2: remote control from the back

                     |   --- aerial
      |                             |
      |                             |
      |     Hf-Modul-Anschluss      |
      |            ooooo            |
      |            12345            |
      | --------------------------- |
      | | various adjusters       | | about the adjusters sits
      | --------------------------- | usually black
      | |        battery          | | plastic lid

Explanation of the HF-Modul-Anschluss:
(Allocation investigates only by " Fairs in the operation without HF-module ")

Michael Boese, November, 1999

Supplement for the transmitter " microprop proportionally 4/6 " of the firm of fire-electronics
Because the transmitter of no buddy socket (mine, not, anyhow), there is no option but to open the transmitter to enable a connection with the printer Port of the PC.

Unfortunately, the output stage of the control module can not be connected directly with the printer Port. It is not able to produce the required Low-level TTL signal. An adaptation step must be interposed .

1. Cable connections go between control module and HF-module to protect the HF-output stage from damage by the operation without aerial and to reduce the power consumption.

2. We need to find the PPM-output signal (point A look at the circuit diagram) and ground in the control module. On my transmitter the output signal about transparent of four leads (black, red, purple, transparent) of the already mentioned cable connection. In order to be sure it is best to measure again with an oscilloscope.

3. Connect an Npn-transistor (BC548 e.g.) to point A (see circuit diagram). The exit is simply taken out as an open-Collector and is connected with the /ACK input (Pin 10) of the PC printer port. Ground is connected with Pin 18 of the printer port. As a load resistance the internal Pullup resistance of the printer Ports is enough so a level adaptation is thereby unnecessary.

Circuit diagram:
Note: the pin at the outlet side transistor step inverts the PPM-signal. However, this has no effect on the operation, because the control information is contained in the timing of the impulses. Therefore it is unimportant whether the time of the rising or falling flanks is measured.

I answer other questions gladly under my email address:

Hans Jürgen Miks, December, 1999

Supplement for the Robbe Promars transmitter
5pole DIN socket seen from the transmitter inside; back view; looking at the end of the cable):

The rectangle PPM signal has a Peak/Peak value of 1.72 V measured to ground.
Remember to disable the HF stage when using with FMS!

Markus Lützenburger, January, 2000

Supplement for the transmitter Futaba-F14

Johann Aichinger, March, 2000

Supplement for the transmitter " HITEC FLASH 4 "
Because the transmitter has neither a buddy socket nor a removable HF-part (mine, not, anyhow), I have opened the transmitter and have searched for the necessary signal with an oscilloscope. It is present as a TTL-signal in a SMD-construction unit with the designation "SY". There I dared to have created a link with a BC 547 an Open-Collector exit.
So the SMD-construction unit is to be found:
Open the transmitter and disconnect the battery compartment cable. In the lower board border 2 rows are found to 20 Pins on top of each other belonging which to the LCD-display (board border) and to the MicroController (about that point, 40-pin). Search from the left counted for the Pins 5 and 6. Approx. 10 mms about this Pins there lies the SMD-construction unit "SY". I have taken the signal according to the following sketch and boarded. Do not forget, remove the crystal!

Stefan Runkel, April, 2000

Supplement for the transmitter " Graupner MC-15 "
The connection with the MC-15 of Graupner is achieved simply and is described as follows.

If one opens the housing and turns round, one sees above the HF-module a small board which contains a multiplicity of pin headers. In both middle connections of the lower socket on the right side (my sketch hopefully helps here!) I have measured the signal and have soldered directly (with 1 meter of cable) to the Parallel port plug (Pins 10 and 18).
Because the level is OK (tested with a Scope), I needed no other level adaptation (Zener diode or similar). If one wants to do it more elegantly, one can also insert a small jack socket (like the pupil's socket) in one of the recesses in the housing.
In operation I have not pulled the crystal to bump off the transmitter, .

If you have questions email:

Markus Plöger, June, 2000

Supplement for the transmitter " Graupner JR FM6014 / PCM18 "
My control GRAUPNER JR FM6014 / PCM18 is not equipped with a buddy-socket. However I quickly found the Pin with the PPM signal. Remove the HF-module. In the picture on the right represented the ground are (brown the Signalpin with 9 V and on the left. I had to reduce the resistance value to 520 ohms, so that it functions reliably.

Stefan Reif, July, 2000

Connection of a remote control to the serial interface
Because the hardware of the parallel interface of PC varies to PC strongly, problems with the Parallel port are often an obstacle. As an alternative FMS also supports a serial interface. Between a remote control and the serial interface one needs to use the following circuit.

Operation of FMS
Keyboard allocation
I Flight initialize (runway)
W Winch launch
R Hand launch
G Increase Throttle
V Full Throttle
B Decrease Throttle
H Zero Throttle
A Display (speed, height)
C Chase mode
+ Zoom to the aeroplane
- Zoom out
Z Automatic zoom
P Pause
U Aeroplane indestructibly
Pilot position:
8 Move towards the aeroplane
2 Move away from the aeroplane
6 Move to the right of the aeroplane
4 Move to the left of the aeroplane
9 Move upwards
3 Move downwards
F12 Hide / show the menu
ESC Finish

Information on FMS
FMS is definitely free, and may be copied arbitrarily often (however, only free of charge) and be transmitted. There is forbidden, however, every sort of the commercial sale or use without our written consent. Modifications in the program, as well as the passing on of the program in incomplete form are forbidden. For losses all sorts which are caused by the program or by an interface, we accept no liability.

The newest version of FMS can be found on the Internet of the following address :
Our email address:
If FMS should not work, you can reach us at the addresses named at the top. Before you email us, you should as far as possible check on our homepage whether there is not already a newer version of FMS or already information on the problem. Unfortunately, we can not any more reply to every mail because our time is limited.

The authors Michael and Roman Möller wish you a lot of enjoyment flying with FMS

Copyright © 1999-2001 Michael and Roman Möller