for the following contributions we would like to thank you the respective authors cordially. Only by the variety of the descriptions of link the parallel port INTERFACE system of the FMS is von Nutzen. If you know a pin allocation or a link circuit not specified here yet, we would be pleased about a short description. Neither we nor the authors of the following contributions take over the adhesion for any damage to computers, INTERFACES or remote control or damages of any art.

I suggested Michael implementing a simpler possibility of using the own remote control as control device for the FMS than the adapters already suggested, which are based on a more or less complex conversion of the remote control signals to a Gameport genehmes signal or on opening the transmitter.

Basic idea is about to connect the transmitter as easily as possible with the PC.
If thus the own transmitter
1. in the PPM procedure operates (or to it to be adjusted can)
and
2. a so-called " teacher pupil socket " has
opposes (meanwhile) nothing more.

One needs only a parallel port plug (25pol Sub d, male, thus with pins), a plug, which fits into the L-Section (sharp edges) socket of the transmitter, approx. 2 meters two-vein line for connecting transmitter and PC (- rear side!), as well as a resistance and a breakdown diode.

The diagram looks as follows:

                        +---------+
   A )------------------| 680 Ohm |---------*--------------------( Pin 10
                        +---------+         |
                                            |
                                          -----
    Right-angle socket                       /                Parallel-
    on transmitter                          /\    ZPD 4,7     Port on
                                           /  \               PC
                                          ------
                                            |
                                            |
   B )--------------------------------------*--------------------( Pin 18

The ring of the breakdown diode must point to the resistance. The ports A and B are different thereby from remote control to remote control. With the seal " Terra Top " and the seal " Luna " of neuzehnhundertdunnemals are it in a " normal " 5poligen diode plug the following pins:

                2           opinion from the front on the plug, one sees
                o           thus the pins in the round
          5 o       o 4
                            (the plugs which I know, have those
         3 o         o 1     numbers stamped)

                -
              Shield (ground)

    A is with pin 1 to connect (Signal)
    B is with Pin 2 to connect (Ground)
    the shield is wired

Ingenious way is wired with these two remote controls still pin 3 and pin 5. If one connects these two pins in the diode plug with a cable link, then NF becomes (or digital)Teil switched on when putting the plug into the transmitter its, without the HF section is likewise supplied with voltage. In this way the lucky owner of such a transmitter does not need to meet precaution, in order to protect the HF section against harm by operation without antenna. Additionally the current consumption without HF section is drastically smaller.
If no such connection is wired in the own transmitter, it is advisable to quiet-add the HF section by pulling the quartz if with FMS to be practiced is.

Still two further transmitter were to me at the disposal: a Robbe/Futaba Skysport 4 of newer date (1997 bought) and a seal 4-Kanal-Anlage of 1995 does not know their name I. These two systems have in each case a 6poligen plug for the L-Section (sharp edges) operation. The allocation is as follows:

                3           Diagram shows the socket on the transmitter.
                o           
          4 o       o 2
                o           
          5 o   6   o 1     

                -
              Shield (ground)

	A is connected to Pin 4 (Signal)
    B is connected to the shield and to Pin 6 (Ground)
	cjg

(Wenx27s interested: With these two newer Robbe/Futaba systems pin 4 is the output at " transmitter ". At " Lehrer-transmitter " this signal at pin 3 must be fed. Thus one has then an inexpensive L-Section (sharp edges) cable for these transmitters.
With the TerraTop or Luna the plug is not a teacher pupil output, but the plug was used, in order " at the soil " without HF radiation the Servos to adjust or to control be able. For this purpose a cable was attached, which has a 3poligen " servo plug " at the other end, which was put into a special input of the recipient. But only besides...)

If the allocation of the L-Section (sharp edges) socket is not well-known, the bent user must inquire or by means of Oszi measure either the allocation with the manufacturer or with the model construction dealer of his confidence. The pin, at which against Ground a square wave signal with a period duration of approx. 1,5ms is to be seen, corresponds to port A.

Whom those the sizing of the " circuit " underlying calculations interest:
I assumed the transmitter with 8 nC-cells is operated. If these 8 cells are quite full-loaded, an operating voltage of any more than approx. 11 V does not place itself with good cells in transmitters (1.34 V per cell). After few minutes operation will then fall the voltage on approx. 9.6 V. After master ohm (U=R*I) leaves itself then in the most unfavorable case with 10 mA shunt current by the breakdown diode the resistance with (11V-4,7V)=R*0,01A - > R=630 ohm to calculate. The next higher standard value is 680 ohms. The shunt current will then adjust in the most unfavorable case (Akkus quite fully) to 9,2mA. The resistance must thus a performance of P=U*I - > P~58mW " verb-guess ", it do thus a normal 100mW type.
The sense of the breakdown diode is in the delimitation of the input voltage for the parallel port to a max. value, which does not harm it (the parallel port) guaranteed. Since those of parallel port generally operate with TTL levels, thus with values smaller 5 V, we are here with 4.7 V on the safe page.
This view applies if the signal at the output of the L-Section (sharp edges) socket a value of greater 5 V has. If the signal is smaller, the voltage-limiting influence of the breakdown diode disappears. In this case the sensitivity of the parallel port input is the critical point. With me accessible parallel port (two Multi IO cards and an Onboard interface on a ASUS Motherboard) a voltage increase of 0.9 V of zero-point was sufficient, in order to bring the test routines of Michael to responding. The probability that the signal at an L-Section (sharp edges) socket a so small level has is however relatively small, since thereby the noise margin falls into critical areas. One considers that in the case of doubt at least one HF transmitter in direct proximity with approx. 1 Watt performance radiates, and no disturbances into the L-Section (sharp edges) cable to be nevertheless one-coupled may (Graupner uses optical waveguide cables for the connection of the two transmitters recently for this reason?).
The area of the admissible operation for our adapter is situated thus between approx. 1 V and 11 V for the L-Section (sharp edges) output signal.
In order the polarity of this signal we need to make here fortunately no thoughts, that from us Michael in its ingenious program already removed ourselves.

This information isn't intended for someone who doesn't know which end of a soldering iron is hot! Beginners should enlist the help of someone more experienced with basic electronics. In other words, don't blame us if you blow up your transmitter or computer. cjg

Harald Sattler, June 1999

The days I got still another remote control into the fingers. A seal Starion, 4 channels, no expandabilities, no L-Section (sharp edges) socket: - ((
Since it concerned with this system however the remote control of my father and I want this summer with it on the meadow, so that he learns to fly its electrical sparrow, I thought, since must itself which make let...

Meant done, the housing opened, and see there, this system has a HF module, which can be removed without tool. At the patch cord could be determined at few expenditure (Oszi), on which pin the digital signal lies close, Ground was found also fast. The digital signal corresponds means acceptance marvelous, thus to 9 V signal amplitude. Fast the adapter plug for the parallel port equipped with resistance and breakdown diode, sufficiently for a long time, 2polige line between them, screen at pins 2 and 3 of a 5poligen of Wirewrap plug, soul of the line at pin 5, the summerhouse is finished.

The diagram in addition looks as follows:

                        +---------+
   A )------------------| 680 Ohm |---------*--------------------( Pin 10
                        +---------+         |
                                            |
                                          -----
    Patch cord                               /                Parallel-
    between Digital-                        /\    ZPD 4.7     Port to
    and HF-section in                      /  \               PC
    Transmitter                           ------
                                            |
                                            |
   B )--------------------------------------*--------------------( Pin 18

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

View into the opened, " on the back which is situated " transmitter:



    +-----------------------------------------------------------~
    | housings from the inside (here is " in front ")
    |                                 Patch cord to the HF section  
    |                               +---------+
    |   ----------------------------|o o o o o|-       (here on the right puts
    |   ----------------------------------------        normally that
    |    Digital circuit board       1 2 3 4 5          HF-section)
    |
    |
    ~
    ~

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

For the plug in the transmitter I have, as already written, a Wirewrap patch cord uses. These plugs consist of four-sharp-edged Messingstaebchen, approx. 0.8 mm thickly, which are welded into a plastic tape next to each other and are 2.54 mm in line in the screen line dimension. So a tape 5 staebchen pinched off, on approx. 12 mm shortened (the staebchen are originally approx. 20mm long, both under the plastic tape measured) and above the plastic tape the line soldered on. To the operation of the transmitter with FMS the cable can be led e.g. by the hole, where the normally that sits quartz. The HF section is anyway plugged off, there needs we thus no to think.

Now still fast, the adjustments for Portabdresse and INTERRUPTS determine and gehtx27s loosely.

To be expected as, no problems: -))

And still info.:
I possessed briefly a Hitec Flash 5 remote control. Those again has an L-Section (sharp edges) socket and can with the Robbe/Futaba Skysport 4 together as L-Section (sharp edges) combination be used (allocation of the pins in the plugs see above). The information to the operation as input device for FMS to the Skysport 4 applies to 1:1 to the steckerbelegung of the Flash 5.

Harald Sattler, July 1999

Here the wiring of the lead on use of a MPX Europe Sprint of transmitter. (should work with all MPX transmitters.) cjg

Note from Chuck Gadd: I built this interface, and it works perfectly on my Multiplex Cockpit MM transmitter.

Plan view on socket in the transmitter:

1 = Battery + 2 = + if switched on 3 = Battery - (ground) 4 = Signal 5 = if connected with 3, no TX radiation Note from Chuck Gadd: As shown in the above list, if you connect Pin 3 and Pin 5 together in your adapter, the transmitter RF section will be disabled. This results in EXTREMELY LONG battery life while flying the sim. I've left the TX on for 12+ hours on a single charge when using the sim.

thus:



The Graupner FM of 314 transmitters can be used also, however with a small specially circuit (then also as transmitter with MC 18/20/24). On the circuit board in the transmitter there is a plug-in connection (3 pin) in the center down. There a GR Servokabel is attached in such a way that the orange link shows to the left, if the open transmitter with the antenna away from one shows. The components can be soldered to 3.5 mm a stereoklinkenbuchsestereoklinkenbuchse stereoklinkenbuchse and the breakdown diode must into the Sub d plug.

Bernd Hagen, November 1999

Link of the remote control FM-SS PROFESSIONAL 7/14 to the parallel port of the PC's for operation with the FMS:

Material:

• 1x restatus 750 OHMS > = 1/8 Watt
• 1x breakdown diode 4.7 V > = 1/8 Watt
• 1x plug 25 polig (male) for link to the parallel port
• 1x circuit board plug 5polig (female). In order to get the correct plug, I my HF module with the electronics loading took. That seems to be a standardized measure.
• approx. 2.5 millimeters contact bush distance.
• 1x 2 poliges cable approx. 2-3m long
• various: (soldering iron/tin ISO tape...)

The FM-SS PROFESSIONAL 7/14 unfortunately neither a link for a teacher/pupil cable still another possesses link to " transmission lots tests ". In the manual it is that the HF module is " of the plug-in type ". (if I quite remember myself, could acquire one for this remote control of HF modules for different frequency bands). Now, at least my module is not only " plug-in ", but fastens additionally with 2 screws. Well, easy Unschaerfen...

As it's built:
Open rear remote control cover (meant is here the entire rear cover, not in into this let in black plastic lids.)
The HF module is centrically on the remote control circuit board. HF module remove.
On the circuit board now a five-pin contact strip (male) should become visible. (to meaning see fig. 2). Circuit board plugs according to diagram 1 and fig. 2 to the cable solder on and attach.
Note! the distance to the remote control cover is quite small. Therefore the upper contact kontaktpinne at the plug bend and the whole well strip.
(at least with me) in the place of the connection in the cover piece of plexiglass is let in, with to open exactly or close could one however a short-circuit produce....(na it knows) the cable leaves itself quite good by the plastic lid opening of the Cover lead out.
Since the connection described above is somewhat wobbly, I short hand the led out cable for the discharge of the patch cord to the upper stretcher handle of the remote control fastened. Covers close: -).
The actual " circuit " I after diagram 1 in the parallel plug accommodated.
finished.
Two words still: This remote control is equipped with a field strength measuring instrument. Since to removing HF module nothing more is transmitted, the display should remain being in the " computer operation " on zero. The described circuit functions even still if the battery test is already for a long time in the red area.

Why a sizing modification of the restatus?
My transmitter is equipped with 9 nicad cells. In particular therefore it is advisable to increase the restatus of that suggested INTERFACE. In order to one switch current (in the worst case) of < 10 mA to come, I a restatus of approx. 733 ohms calculated. The next standard value is to 1/8 Watt with 750 ohms, is sufficient. (restatus and breakdown diode are here rather only meant the remote control or the transmitter for protecting in the case of a false link. With the small price of perhaps 2DM I would not save here however really)
I saw on the circuit board with the Anschlusstelle Akku/Fernsteuerungsplatine, which the transmitter can be operated probably with normal batteries. Perhaps in this case one could use larger restatus for safety reasons still another...

The diagram 1 looks as follows:


                        +---------+
   5 )------------------| 750 Ohm |---------*--------------------( Pin 10
                        +---------+         |
                                            |
                                          -----
    HF-Board                                 /                Parallel
    in the transmitter                      /\    ZPD 4.7     Port on
                                           /  \               PC
                                          ------
                                            |
                                            |
   2 )--------------------------------------*--------------------( Pin 18



Fig. 2:  Remote control from the rear
                           ------


                     |
                     |   --- Antenna
                     |
      -------------------------------
      |                             |
      |                             |
      |        Hf-Module-Link       |
      |            ooooo            |
      |            12345            |
      | --------------------------- |
      | |   various adjusters     | | over the adjusters        
      | --------------------------- | normally the black
      | |          Battery           | | Plastic covers
      -------------------------------
 

Assertion HF module link:
(allocation only by " fairs in operation without HF module " determines)

• 1: (no direct passage to the antenna)
• 2: Akku minus
• 3: (seems to have no direct passage to the Akku, in operation however about like 4)
• 4: Akku plus (max. approx. 9x1,34 V=12,06 V)
• 5: Switching impulse (negative i.e. has depending upon status of the information of signal passage to 2 or no passage)

Michael bad, November 1999

there the transmitter no teacher pupils socket had (mine anyhow not), remains nothing different one to open than the transmitter in order to make a connection to the printer port PC.

The output stage of the control module cannot be connected unfortunately directly with the printer port. It is not in a the position to produce the necessary TTL Low level. Thus an adaptor stage must be inserted.

1. Cable connections between control module and HF module take off, in order to protect and reduce by the current consumption the HF output stage against harm by the operation without antenna.

2. PPM output signal (point A in the connection diagram) and Ground on the control module look up. With my transmitter the output signal is led across the transparent of the four braids (black, red violet, transparency) of the cable connection already mentioned. Check with uncertainty best with an oscilloscope.

3. Npn transistor (BC548 o.ae.) to point attach A (see connection diagram). The output is led out easily as open Collector and connected with / ACK input (pin 10) PC of the printer of port. Ground is to be connected with pin 18 of the printer of port. As working resistance the internal Pullup resistance of the printer of port serves. Thus an adjustment in level is unnecessary.

Connection diagram:

Since the hardware of the parallel interface vary greatly from PC to PC, problems with the parallel port interface are not rare. As an alternative, FMS also supports a serial inteface. To connect the transmitter to the serial port, the following circuit is needed: cjg

error detection only with Simualtor as almost not possibly heraustellte, we attached ourselves a small test routine there to the FMS: INTTEST.EXE.

If the test routine under Windows is to be started, then this must occur in the frame mode, so that there are no disturbances by the operating system. After starting the test routine this tests the address of the I/O area. The address must be input thereby with prominent dollar character ($), so that you as hexadecimal number one detects. The program tests the INTERFACE in mehrern steps and outputs the respective assistance directly on the display.