Multiplex RX-5-SYNTH IPD CAR Instructions page 10

4. The receiver must now be switched OFF, then ON again
( 10.); it will now be operating on the set RF channel
The receiver stores the set RF channel permanently until either
you set a new RF channel, or RESET the receiver to the factory
default settings ( 15.).
! Note: signal OFF during RF channel search
The signal output to the servo outputs remains switched OFF
during the RF channel search process, i.e. the servos do not
move and are "soft", and (modern) electronic speed controllers
stay OFF, because the signal is absent. Nevertheless, it makes
sense to secure the model and keep well clear of hazardous
parts.
12. IPD (I
NTELLIGENT
The RX-5 SYNTH IPD CAR receiver features an IPD decoder;
the abbreviation IPD stands for Intelligent Pulse Decoding. The
"intelligence" takes the form of a micro-processor which ana-
lyses the signals picked up from the transmitter, processes them
(where necessary) and then passes them on to the servos. The
received signals are not simply passed on directly to the servos,
as with conventional FM/PPM receivers, but are checked for
interference and validity.
The advantages of IPD technology:
1. Only permissible signals "get through"
IPD checks the signals for limit values: pulse widths within
the range 860 µsec and 2.350 µsec are permissible. Most
radio control transmitters work within these limits, including
other makes of equipment.
2. "Invalid" signals are substituted (HOLD)
If an invalid signal is picked up, the receiver continues to
pass on the last received valid signal until a "good" signal is
received again (HOLD period). This suppresses interference,
or at least reduces its effects.
3. "Safety setting" in the case of total failure (FAIL-SAFE)
If no valid signal is picked up beyond the HOLD period (0.5
sec.) the IPD receiver moves the servos to a freely pro-
grammable setting (FAIL-SAFE position
to idle, control surfaces to neutral.
4. IPD monitors reception quality
The signal analysis process is automatically adjusted to suit
the current reception quality (field strength). Powerful signals
are passed on to the servos unchanged, but weak received
signals are "processed". The nominal servo positions are
then calculated from the last "good" signals. This greatly re-
duces the effect of interference, but the pilot remains aware
of the problem (unlike with PCM). He receives a warning,
and is able to react appropriately.
5. IPD is compatible
IPD works on the same basis as the current FM-PPM trans-
mission process. IPD receivers, with all their advantages,
can therefore be used with most RC systems.
13. A FAIL-SAFE
CTIVATING
The effect of the FAIL-SAFE settings is that the servos (etc.)
take up a pre-defined position, previously stored in the receiver,
if interference occurs.
If FAIL-SAFE has not been activated (factory default state, or
after a RESET ( 15.), the signal is switched off after the HOLD
period (0.5 sec.). This means that the servos become "soft" and
remain in their last commanded position under no load (this may
equate to full-throttle!) until a valid signal is picked up again.
! Note: always activate FAIL-SAFE
In the interests of safety we recommend that FAIL-SAFE should
always be activated, and the FAIL-SAFE settings should be se-
lected so as to bring the model to a non-critical situation (e.g. mo-
MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten (Gölshausen) • www.multiplex-rc.de
Operating Instructions
RX-5 SYNTH IPD CAR receiver – Software V 1.2x
P D
ULSE ECODING
13.), e.g. motor
tor idle/brake on, electric motor OFF/brake on, steering neutral).
Sequence:
1. Switch ON the transmitter, then the receiver. The LED
flashes:
LED Code 3
2. Move all the transmitter sticks and other controls to the
desired FAIL-SAFE positions (e.g. motor idle, directional
control neutral)
3. Press the button briefly (approx. 0.5 seconds); the LED goes
out
FAIL-SAFE is now active, and the FAIL-SAFE settings are
stored
)
! Note: do not hold the button pressed in for too long
If you hold the button pressed in for too long (> 2 sec. - until
the LED comes on), the IPD filter is switched off (
this case FAIL-SAFE is not activated, and the FAIL-SAFE
settings are not stored!
4. Testing the FAIL-SAFE settings
Move the sticks to positions other than the FAIL-SAFE
settings, then switch OFF the transmitter. The servos should
now move to the FAIL-SAFE settings previously stored, once
the HOLD period (0.5 sec.) has elapsed
! Notes: tips and information relating to FAIL-SAFE
The FAIL-SAFE settings are only stored if the IPD filter is
active, and if no errors are displayed:
LED Code 3
If you change the transmission mode (e.g. with the PROFI
CAR by changing the mode PPM 7
HRS-2), you must re-set the FAIL-SAFE positions! (
The FAIL-SAFE settings must always be checked and
brought up to date if, for example, you install the receiver in a
new model, or make an accidental mistake in programming
the receiver (
The maximum FAIL-SAFE duration is limited to 15 seconds.
After this the servo signal is switched off
come "soft", an electric motor speed controller switches off
the motor in the absence of a signal. This eliminates the
danger of jammed mechanical linkages stalling the servos
(e.g. after a collision), which would usually wreck them
If FAIL-SAFE has not been activated, servos with their own
HOLD or FAIL-SAFE function (e.g. MULTIPLEX mc and
mc/V2 series digital servos) do not become "soft" after the
HOLD period has elapsed
1,6 sec
1,6 sec
13.4)
14.). In
HRS-2, HRS-3
13.)
the servos be-
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