RX 12 DS IPD receiver
modelltechnik gmbh • Neuer Weg 15 • D-75223 Niefern
RX 12 DS IPD # 82 5598 (01-05
-
16)
to a maximum continuous current of about 400 mA per
servo if 12 servos are used. The current which a servo
actually draws in practice varies according to the servo
type (analogue amplifier, digital servo, rated output
power, ...) and to the actual model application (size and
weight of control surfaces, airspeed, gyro installed, ...).
Caution:
stiff or mechanically obstructed linkages (e.g.
retract servo) can increase the current substantially.
6. D
EFAULT
S
TATE
: S
TAND
-
BY
It is not possible to devise a fail-safe position which is really
suitable for every model and every situation. For this reason
IPD receivers in their default state switch to stand-by mode if
no valid signals are picked up for a period longer than 0.5
sec. Stand-by means this: the receiver does not pass any
signals to the servo (
see also IPD glossary
). As soon as the
receiver detects “good” signals again, it resumes working
normally.
Once you have programmed your chosen fail-safe positions
into the receiver for the first time, it is not possible to set it
back to stand-by mode. However, the fail-safe positions can
be changed at any time.
7. P
ROGRAMMING
/C
HANGING
F
AIL
-S
AFE
-P
OSITIONEN
You are free to choose the positions which the servos take up
in the case of interference, or if the signal fails completely.
There are two methods of programming these settings:
1. Using the programming plug supplied
2. Using the fail-safe programming lead
If you want to change the programming,
the receiver must be switched off briefly beforehand.
1. Programming using the programming plug
supplied
a) Set the transmitter controls for the critical functions
(throttle, retracts ...) to non-hazardous positions, then
switch the transmitter on, followed by the receiving
system in the model.
b) Set the desired fail-safe positions for all functions using
the transmitter controls.
c) Insert the programming plug in socket
D for a moment (1 second is sufficient),
then withdraw it again.
This action stores the fail-safe positions
permanently in the receiver.
d)
!
!
Check the programmed settings
(
è
3.)
2. Programming using the programming lead
The programming lead
(# 8 5117
with UNI connector,
# 8
5198
with MPX connector) is available as an accessory, and
should be connected to socket D. The settings are
programmed by pressing the button. The programming lead
can be left in the model if you wish to carry out tests with the
fail-safe settings.
3. Checking the programmed settings
Switch the transmitter on again, and move the controls to
positions which do not correspond to the fail-safe settings.
Now switch the transmitter off. After a delay of 0.5 seconds
the servos should run to the positions you have just
programmed.
IPD glossary
Programmable fail-safe
If the receiver picks up no valid signals, the servos move to a fi-
xed programmable setting. This provides a measure of safety
(e.g. motor stopped) if massive interference should occur. The
fail-safe also allows you to run the servos to safe positions if you
suffer an “out-landing” with the model.
Hold mode
If invalid signals are picked up, the receiver passes on to the ser-
vos the last valid signals it received. It continues to do this until
it picks up “good” signals again, but only for a period of up to
0.5 seconds. This suppresses brief interference, or reduces its ef-
fect. If no valid signals arrive for a period longer than 0.5 sec, the
receiver reverts to
è
fail-safe mode (or
è
stand-by mode, if fail-
safe settings have not yet been programmed).
Intelligent
Every received signal is checked!
Only permissible signals are passed on to the servos. Invalid sig-
nals are ignored by the IPD receiver, which replaces them with
the previously received valid signal (
è
HOLD mode).
Signal strength is monitored!
The receiver assesses the signal constantly, and automatically
adjusts its processing according to the momentary signal
strength (field strength). Powerful signals are immediately
passed on to the servos unchanged. However, the weaker the
received signal becomes, the more the receiver “processes”
them, i.e. the IPD receiver calculates the intended servo position
from several groups of signals. This process greatly reduces the
effect of any interference, but at the same time alerts the pilot to
a potential problem (unlike a PCM system). In effect the pilot re-
ceives a warning, and is able to take appropriate action (e.g.
change direction of flight, set transmitter aerial vertical).
If total signal failure occurs, the receiver supplies a “substitute”
signal!
If no valid signals are picked up for more than 0.5 seconds, the
IPD receiver passes the programmed fail-safe positions to the
servos.
IPD = I
ntelligent-
P
ulse-
D
ecoding
The IPD receiver incorporates a micro-processor which makes it
possible to assess (decode) the control signals from the radio
control transmitter intelligently.
Compatibility
You can exploit the advantages of IPD with
any
transmitter,
provided that it utilises the most common method of transmis-
sion (FM PPM) and transmits 2 to 9 channels.
The receiver automatically detects the 12 channels of the PROFI
mc 4000 transmitter. The MULTIPLEX Customer Service dept.
can also modify the RX 12 DS to suit the 12-channel (24-
channel) format of the GRAUPNER mc-24.
Note: IPD receivers must always be used with MULTIPLEX crys-
tals. The transmitter must be fitted with a genuine crystal sup-
plied by the transmitter manufacturer.
Stand-by = Default state
If no valid signals are picked up for a period longer than 0.5 sec,
and you have not yet programmed the fail-safe settings
, the
receiver simply switches off the servo signals. For safety reasons
this is the mode in which the receiver is supplied. This is because
the vast range of possible applications makes it impossible to
program a fail-safe setting which is equally suitable for all cases.
In stand-by mode, servos with
standard electronics
become
“soft”, i.e. they can be rotated to any position by hand. In this
mode servos with
mc/V2 electronics
move to their fail-safe po-
sition, if this has been programmed.
