Power Supply; Receiver Connections - Multiplex RX-7 SYNTH DS M-PCM/PPMcompact Bedienungsanleitung

6. T M-PCM T
HE
Like all analogue systems, PPM contains a degree of background
noise which becomes more significant with increasing range. The
result is that servos start to jitter even when the distance between
model and transmitter is only moderate. The MULTIPLEX IPD
system reduces servo jitter, but at the cost of resolution and
response speed. In practice, the receiver's inherent noise level
restricts resolutions to around 500 increments (steps).
MULTIPLEX-PCM (M-PCM) is a digital transmission system. It
uses a newly developed encoding process to transmit twelve fast,
equal-value servo channels with a resolution of 3872 steps (12-
bit). The background noise has no influence on the accuracy of
the servo signals right up to the effective limits of range.
Resolution, centring precision and therefore accuracy of control
remain at a constant high level right to the range limit, whereas
these parameters steadily deteriorate towards the range limit with
PPM and / or IPD. However, at the range limit reception fails more
abruptly and with considerably less warning than with PPM. Digital
encoding mean that both Hold mode and Fail-Safe operate much
more accurately and reliably than is possible with PPM and IPD.
In the M-PCM system the twelve servo channels are divided into
three groups of four servos (servo channels 1 ... 4, 5 ... 8, 9 ...
12). Signals are fed to the servos in each group virtually simul-
taneously, and for this reason they run more synchronously than
would be possible with PPM.
! Tip: wherever possible assign associated servos to one
group (see transmitter operating instructions).
7. P S
OWER UPPLY
These receivers work safely with four-cell, five-cell and six-cell
NiXX or 2S LiPo / 2S LiIo receiver batteries, corresponding to a
voltage of 4.0 to 9.0 V.
! Note: if you wish to use a five-cell (six-cell) NiXX battery,
please check that all the servos and other components
(especially gyros) are approved by the manufacturer for use with
operating voltages of up to 7.5 V (9.0 V). If you wish to use a 2S
LiPo (2S LiIo) battery, please check that all the servos and other
components (especially gyros) are approved by the manu-
facturer for use with operating voltages of up to 8.4 V (8.2 V).
! Note: ensure that power supplies are in good condition
If the radio control system is to operate reliably, a receiver bat-
tery in good condition and of adequate capacity for the particular
application is absolutely essential:
Use high-quality receiver batteries of adequate capacity ex-
clusively, and take the trouble to condition, charge and
maintain them properly.
Ensure that cables are of adequate cross-section. Battery
leads should be as short as possible. Keep the number of
plug-in connections to a minimum.
Use only high-quality switch harnesses.
Brief collapses in battery voltage lasting a few milliseconds
have no adverse effect on the receiver, whereas longer
voltage collapses to below 4.0 V can cause malfunctions.
The cause may be a faulty or almost flat receiver battery, a
pack of insufficient capacity, cables of inadequate cross-
section, poor connectors or an overloaded or defective BEC
system.
8. R C
ECEIVER ONNECTIONS
These receivers utilise the UNI connector system, which is com-
patible with the connectors used by most radio control equip-
ment manufacturers (e.g. HiTEC, robbe/Futaba, Graupner/JR).
The receiver sockets are marked as follows:
MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten (Gölshausen) • www.multiplex-rc.de
Operating Instructions RX-7-SYNTH M-PCM /
RX-7/9/12-SYNTH DS M-PCM / RX-9-SYNTH DS M-PCM compact receivers
S
RANSMISSION YSTEM
1, 2, 3 ... 7 Servo sockets, channels 1, 2, 3 ... 7
(... 9 or 12) (... 9 or 12).
Receiver battery socket.
Two sockets are present on the RX-7-SYNTH
B
DS M-PCM for enhanced security: double the
cable cross-section and twice the number of
contacts.
Receiver battery socket on the RX-9-SYNTH
DS M-PCM compact.
B/D
Socket for Diagnosis (closed loop), PC or
Diversity lead, or the MULTImate. Alternatively:
supplementary parallel power supply connector.
Receiver battery socket utilising MULTIPLEX
BATT
M6 high-current connector.
! When connecting the receiver battery, servos, speed
controllers etc. please take care to maintain correct
polarity. This applies in particular to the pin assignment
of different makes of equipment:
! Note the correct polarity of the M6 connector system
(+ / -) with the RX-9/12-SYNTH DS M-PCM!
! Don't insert connectors the wrong way round!
9. F U , F
IRST SE UNCTIONS
9.1 Setting the RF channel / first use
M-PCM receivers are fitted with a modern frequency syn-
thesizer, i.e. plug-in crystals are no longer necessary. The first
time you use the receiver (and also whenever you wish to
change the channel) you will need to carry out an RF channel
search (frequency scan) in order to set the receiver to the
transmitter's RF channel. During this process no signals are sent
to the servos; they can safely be left connected to the receiver.
Setting the desired RF channel:
1. Extend the transmitter aerial to full length, and keep it at
least three metres away from any other transmitter. Switch
the transmitter on, and set its transmission mode to M-PCM
(not PPM!).
2. Locate the SET button on the top of the receiver, and hold it
pressed in with a pointed object; at the same time connect
the receiver battery to the receiver, or turn the system ON
using the switch harness.
3. Now release the SET button: the receiver's (STATUS) LED
flashes at a high rate (LED code 2,
the receiver is searching for the most powerful RF channel.
! Note: the first time you use the receiver the RF channel
search will start even if you do not press the SET button, as
no RF channel is set (factory default setting).
4. If the receiver picks up an error-free M-PCM signal, the
(STATUS) LED lights up continuously (LED code 1,
Now move any transmitter stick four times to the same end-
point. The (STATUS) LED will switch OFF / ON in time with
the stick movement.
This procedure allows you to check that the receiver has
stored the correct RF channel and transmitter.
5. After this the (STATUS) LED flashes to confirm it has stored
the channel:
2 x briefly, followed by a pause (LED code 5,
6. Disconnect the battery, or move the switch to OFF.
7. Switch the receiver ON again, and it is ready for use. The
receiver's (STATUS) LED flashes slowly and evenly (LED
Code 3, 9.3) if it is picking up an M-PCM signal. If not, it
lights up constantly.
9.3) to indicate that
9.3).
9.3).
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