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Operating Instructions for RX-7-DR M-LINK /
RX-9-DR M-LINK 2.4 GHz receivers
MULTIPLEX Modellsport GmbH & Co.KG • Westliche Gewerbestraße 1 • D-75015 Bretten (Gölshausen) • www.multiplex-rc.de Page 4/6
Ins
tr
uc
tions
for
R
X
-7
/9-
D
R
M-
LIN
K
2.
4 G
H
z r
e
ce
iv
er
s # 985 531
9 (
10-
02-
24/M
IW
A
) •
E
rr
o
rs
and om
is
si
ons
ex
cepted! •
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MU
LT
IP
LE
X
Hold the SET button pressed in for at least ten seconds (as a
guide, the LED goes out when you press the button, comes on
again after two seconds, then off again after ten seconds).
When the RESET has been carried out, the LED displays the
confirmation signal (LED code 5
Î
8.1
), and the receiver
switches to binding mode.
!
Note:
it is not possible to carry out a RESET if the receiver is
in binding mode (LED flashing at high frequency).
8.7 Overview of the factory default settings and
variable set-up values
Parameter
Default setting Set-up value
variable using
MULTImate*
and
RX DataManager*
Low voltage
(error counter)
4.5 V
Yes
HOLD period
0.75 seconds
Yes
FAIL-SAFE period
16 seconds
Yes
FAIL-SAFE
Off
Can be activated
channel by channel
Receiver name
Internal ID
Max. 12 characters
Address for receiver
battery voltage
0
Yes
Address for
connection quality
1 Yes
*Refer to Chapter (
Î
11.
) here.
8.8 Error counter
The receiver features two error counters: for low voltage and
signal errors.
The receiver LED indicates the sum of the seconds during which
errors were detected.
If errors are indicated, they can be saved (stored) after the
landing using the SET button (
Î
8.2
), and read out again later
(
Î
11.
).
1.
Operating voltage errors
Examples: flat or faulty battery, inadequate cable cross-
section, etc.
The error count contains all voltage collapses below the
threshold of 4.5 V (value can be changed using the
MULTI-
mate
or
RX DataManager
Î
11.
).
2.
Signal errors
The count contains instances of interference to the M-LINK
signal packet. For example, this could indicate problems in
the power supply, a defective aerial, etc.
Signal errors are recorded in virtually every flight. In most
cases the pilot does not notice them, but they are still picked
up by the extremely sensitive error counter.
After a few flights, and regular analysis of the error counter, you
will gain the experience required to render the error counter
genuinely helpful, enabling you to detect changes in good time,
and to locate indications of possible causes of interference.
!
Protracted voltage collapses below 3.5 V cause the receiver
to re-boot. If this occurs, the values for both error counters are
lost permanently.
!
If you press the SET button for the purpose of saving the
error count, the stored information is retained until the next time
you save the error count.
9.
T
ELEMETRY
/ F
EEDBACK
C
APABILITY
The telemetry-capable
RX-7-DR M-LINK
and
RX-9-DR M-LINK
2.4 GHz receivers offer a means of transmitting data from the
model back to the transmitter.
When these receivers are employed, the telemetric values for
“receiver battery voltage” and “connection quality” are transmitted
directly, i.e. they require no additional external sensors.
The receivers can also be used in conjunction with up to sixteen
external M-LINK sensors, which are connected to the SENSOR
socket. In this way a very wide variety of telemetry data can be
“sent back” to the pilot.
!
Note:
The possible methods of indicating telemetry data by visual
and / or audible means vary according to the M-LINK trans-
mitter or RF module in use.
Examples of external M-LINK sensors are as follows:
x
Voltage
sensor
(
# 8 5400
).
x
Temperature
sensor
(
# 8 5402
).
x
Current
sensor:
Max. 100 A (
# 8 5401
) or max. 35 / 60 A (
# 8 5403
).
x
Rev count sensor:
Optical (
# 8 5414
) or magnetic (
# 8 5415
).
x
Vario / altitude sensor (
# 8 5416
).
For more information on connecting and operating the various
sensor types and their features (measurement range, addres-
sing, warning threshold settings, display facilities for minimum,
average or maximum values, in some cases activation of a
second measurement channel, ...) please refer to the instructions
supplied with the sensors and / or the
MULTImate
.
10. T
WO
-R
ECEIVER
M
ODE
MULTIPLEX
RX-7/9-DR M-LINK
receivers are what are known
as “dual receivers”, (“
DR
”): each receiver case contains two
complete receiving circuits operating in parallel (“receiver diver-
sity”). It is also possible to connect
two
receivers together using
the Diversity lead (
# 8 5070
). In this configuration a total of four
receiving circuits is operating in parallel:
All four receiving circuits installed in the two receiver cases pick
up and assess the signals (“quadruple diversity”). In this section
we refer to this type of diversity as “two-receiver mode”.
Two-receiver mode is possible with various MULTIPLEX M-LINK
receivers starting with the
RX-7-DR M-LINK
. You can also connect
different M-LINK receiver types together, provided that both are
capable of two-receiver operation (e.g. 1 x
RX-16-DR pro M-LINK
and 1 x
RX-7-DR M-LINK
).
The different orientation of all four receiver aerials provides a
further improvement in the reception performance, since this
arrangement minimises the directional aerial effect. This means
that one receiver aerial always has a good “view” of the trans-
mitter regardless of the model’s attitude. Two-receiver mode
therefore provides an additional safety margin. Two-receiver
mode is particularly recommended for use in large-scale model
aircraft.
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