Multiplex RX-7 SYNTH IPD Instructions D'utilisation page 10

12. IPD (I P
NTELLIGENT
The RX-7 SYNTH IPD and RX-7 SYNTH DS IPD receivers feature 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 signals 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 period). 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 13. ), e.g. motor to idle, control surfaces to
neutral.
4. IPD monitors reception quality
The signal analysis process is automatically adjusted to suit the cur-
rent 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 interference, but the pilot
remains aware of the problem (unlike with PCM). He receives a warn-
ing, and is able to react appropriately.
5. IPD is compatible
IPD works on the same basis as the current FM/PPM transmission
pro-cess. 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:
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 / electric
motor OFF, control surfaces neutral, airbrakes extended, aero-tow
release open, ...).
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 desired 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!
MULTIPLEX Modellsport GmbH & Co.KG • Neuer Weg 2 • D-75223 Niefern-Öschelbronn • www.multiplex-rc.de
Operating Instructions Receiver
RX-7 SYNTH / RX-7 SYNTH DS IPD — Software V 1.1x
D )
ULSE ECODING
14. ).
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. by changing from PPM 6
PPM 7, PPM 7 PPM 9), you must re-set the FAIL-SAFE positions!
(see also 20. )
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
tric 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 ser-
vos) 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 sys-
tem, 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.
Sequence
1. Switch the transmitter on, then switch the receiver on. The LED
flashes:
1,6 sec
LED Code 3
2. Press the button (the LED goes out), and hold it pressed in until the
LED comes on again (after about 2 seconds).
The LED then flashes as follows:
1,6 sec
LED Code 4
You can re-activate the IPD filter by either of the following methods:
Switch the receiver off, then on again
or
Hold the button pressed in again for > 2 seconds (see above)
! Note:
In the interests of safety the IPD filter should only be switched off for
range checks or other experimental purposes. Normal operations should
always be carried out with the IPD filter activated.
13.4 ).
the servos become "soft", an elec-
IPD
FILTER
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