User manual
250
Program description - Telemetry
Satellite mode
… two HoTT receivers are connected to one an-
other through a three-wire connecting cable (or-
der no. 33700.1 (300 mm) or 33700.2 (100 mm))
at receiver-type-specific servo connections. Type
GR-16 and GR-24 receivers, for example, are to
be connected with one another at servo output 6
respectively 8. More detailed information can be
found on the Internet at www.graupner.de.
All the channels of the HoTT receiver configured
as SUMO (or the channels selected in the “CH
OUT TYPE” line) and designated satellite receiver,
are passed constantly to the second HoTT receiv-
er via this connection; this is the primary receiver,
which is designated …
• SUMI (sum signal IN)
… the designation for the main receiver. Therefore,
the signal always goes toward SUMI:
RX SERVO TEST
ALL–MIN : 1000µsec
ALL–MAX : 2000µsec
ALARM VOLT : 3.8V
ALARM TEMP–:–10°C
ALARM TEMP+: 55°C
TEST : START
CH OUT TYPE:SUMI
The receiver defined as SUMI, however, only uses
the sum signal coming from SUMO in the event of
a failure of receipt if at least one channel in SUMI
is programmed to fail-safe.
If the receiver programmed as the SUMO satellite
receiver has a reception outage, the servos con-
nected to this receiver assume the fail-safe po-
sitions which were programmed into the satellite
receiver, completely independent of the main re-
ceiver.
On the other hand, if two receivers have a recep-
tion outage simultaneously, the fail-safe settings in
the current receiver software at the time this man-
ual went to revision (in principle, the SUMO’s fail-
safe settings) become effective. In the individu-
al case, however, interactions cannot be ruled out,
which is why we urgently recommend perform-
ing an appropriate test BEFORE commission-
ing a model.
This receiver combination is recommended if, for
example, one of the two receivers is installed in
the model at an unfavorable position for recei ving
or as a result of nozzles, carbon fiber material or
the like, there is the danger that the receipt sig-
nal is weakened due to the flight position, so that
interruptions of the range must be taken into ac-
count.
Therefore, make sure to connect the most impor-
tant control functions to the main receiver pro-
grammed as SUMI, so that, in the event of a fail-
ure, the model remains controllable when the
SUMO satellite receiver no longer receives a sig-
nal.
Telemetry data, such as the voltage of the on-
board electricity supply, on the other hand, is only
sent to the transmitter by the satellite receiver con-
figured as SUMO. For this reason telemetry sen-
sors must be connected to the satellite receiver
(SUMO), and this receiver must also be defined as
such in the “TEL.RCV.” line of the »Telemetry«
menu (Bind 1 … 2); see “Important notes” on page
240. Each receiver should be connected with its
own supply line from the common voltage supply.
With receivers with a high current load, it may
even be beneficial to connect them with two sup-
ply lines to the same current supply. .
On the other hand, if
each of the two receivers
should be supplied from
its own voltage source,
the center cable must be
removed from one of the
two plugs of the satellite
red
1
2
3
cable; see figure.
If you would like to carry out additional program-
ming, such as fail-safe settings, disconnect the
three-pole satellite connection between the two re-
ceivers and switch on only the relevant receiver. It
may be necessary to also change the connection
sequence.
• SUMD (digital sum signal)
A HoTT receiver configured as SUMD, as de-
scribed above, constantly generates a digital sum
signal from the control signals of a (user-defined)
number of its control channels, and makes this
available at the following receiver outputs (receiv-
ers supplied in the sets as standard):
GR-16 at servo socket 6
GR-24 at servo socket 8
At the time these instructions were revised this
type of signal is exploited by a few of the latest
electronic developments in the fields of flybarless
systems, high-capacity power supply systems, etc.
However, if you wish to use this facility it is es-
sential to read and observe the set-up notes
supplied with the device connected to the re-
ceiver, otherwise there is a risk that your mod-
el will be uncontrollable.
RX SERVO TEST
ALL–MIN : 1000µsec
ALL–MAX : 2000µsec
ALARM VOLT : 3.8V
ALARM TEMP–:–10°C
ALARM TEMP+: 55°C
TEST : START
CH OUT TYPE:SUMDHD12
When you confirm “SUMD” by briefly pressing
the central SET button of the right-hand four-way
button, the active Value field moves to the right,
where you can select one of three possible receiv-
er responses in the case of reception failure (Fail-
Safe):