Multiplex RX-5 SYNTH IPD CAR Instructions page 10

Note:
The signal output to the servo outputs remains switched off
during the RF channel search process, i.e. the servos do not
move, 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
analyses 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 sig-
nals for limit values: pulse widths within the range 860 µsec
and 2350 µsec are permissible. Most radio control transmit-
ters 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 pe-
riod). This suppresses interference, or at least reduces its ef-
fects.
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 programmable
setting (FAIL-SAFE position
trol 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 reduces the effect of interfer-
ence, but the pilot remains aware of the problem (unlike with
PCM). He receives a warning, and is able to react appropri-
ately.
5. IPD is compatible IPD works on the same basis as the cur-
rent FM-PPM transmission pro-cess. IPD receivers, with all
their advantages, can therefore be used with most RC sys-
tems.
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:
In the interests of safety we recommend that FAIL-SAFE should
always be activated, and the FAIL-SAFE settings should be
selected so as to bring the model to a non-critical situation (e.g.
motor idle / brake on, electric motor OFF / brake on, steering
neutral).
MULTIPLEX Modellsport GmbH & Co.KG • Neuer Weg 2 • D-75223 Niefern-Öschelbronn • www.multiplex-rc.de
Operating Instructions
RX-5 SYNTH IPD CAR receiver – Software V 1.1x
P D )
ULSE ECODING
13. ), e.g. motor to idle, con-
Sequence
1. Switch on the transmitter, then the receiver. The LED
flashes:
1,6 sec
LED Code 3
2. Move all the transmitter sticks and other controls to the de-
sired FAIL-SAFE positions (e.g. motor idle, control surfaces
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:
If you hold the button pressed in for too long (> 2 sec. - until
the LED comes on), the IPD filter is switched off (
In 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:
•
The FAIL-SAFE settings are only stored if the IPD filter is
active, and if no errors are displayed:
1,6 sec
LED Code 3
•
If you change the transmission mode (e.g. with the PROFI
CAR by changing the mode PPM 7 HRS-2, HRS-3 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 ( 12.4 ).
•
The maximum FAIL-SAFE duration is limited to 15 seconds.
After this the servo signal is switched off ⇒ the servos be-
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.
14. S
WITCHING OFF THE
The IPD filter ( 12. ) can be switched off if necessary. In this
mode the receiver operates like a conventional FM/PPM unit, i.e.
the signals picked up are passed directly to the servos (etc.).
This can be useful, for example, to locate sources of problems to
the receiver caused by the power system, or the arrangement of
the receiving system components. The filter should always be
switched off for range-checking, so that it does not filter out any
interference (undesirable in this case). Changes can then be
made as required.
14. ).
13. )
IPD
FILTER
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