Graupner Hendheld RC 2.4 GHz No. of channels: 12 33124 Data Sheet

218 Detail program description - Control adjust

A HoTT receiver confi gured as SUMO permanently 
generates a so-called sum signal from the control 
signals of all of its control channels and provides this 
by default to the accompanying GR-24 receiver at 
servo connection 8.
On receivers whose display shows "SUMO" at the 
top right, an additional two-digit number appears ...

… the active fi eld changes after confi rmation of 
"SUMO" by briefl y pressing the central 

 key 

of the right touch pad for the channel selection. 
With this selection you specify the highest of the 
transmitter channels contained in the SUMO signal:

You can confi rm the default by pressing the 

 key 

of the right touch pad again or by selecting one of 
the other channels between 04 and 06 with the arrow 
keys and confi rming with 

. 

The receiver outputs are controlled successively in a 
cycle of 20 ms (30 ms with the receiver GR-24, Order 
No. 33512,), even if 10 ms is set in the "PERIOD" line 
of the the "RX SERVO" display page.
Primarily intended for the "Satellite mode" of two 
HoTT receivers, as described in the following, the 
generated sum signal defi ned by the receiver as 
SUMO can be used for the control of fl ight simulators; 
this is also the case for the control of fl yable systems, 
insofar as they have the corresponding input or the 
adapter cable with Order No. 33310. 
In …

  Satellite  mode 
… two HoTT receivers are connected to one another 
through a three-wire connecting cable (Order No. 
33700.1 (300 mm) or 33700.2 (100 mm)) at receiver-
type-specifi c servo connections. Receivers of the 
type GR-16 and GR-24, for example, are to be 
connected with one another at servo output 8. More 
detailed information can be found on the internet at 
www.graupner.de.
Through this connection, all channels of the HoTT 
receiver which was confi gured as SUMO and 
identifi ed as a satellite receiver are transmitted to the 
second HoTT receiver, the main receiver, which is to 
be programmed as ...
SUMI (sum signal IN)

 Therefore, the signal always goes toward SUMI:

The receiver defi ned 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 SUMO satellite 
receiver has a failure of receipt, the servos connected 
to this receiver assume the fail-safe positions 
programmed in the satellite receiver completely 
independently of the main receiver.
On the other hand, if a failure of receipt takes place 
with two receivers simultaneously, the receiver 
software current at the time of the printing of 
this manual falls back on the fail-safe settings of 
SUMO. In the individual case, however, interactions 
cannot be ruled out, which is why we urgently 
recommend performing an appropriate test 
BEFORE commissioning 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 receiving 
or as a result of nozzles, carbon fi ber material or 
the like, there is the danger that the receipt signal 
is weakened due to the fl ight position, so that 
interruptions of the range must be taken into account.
Therefore, make sure to connect the most important 
control functions to the main receiver programmed 
as SUMI, so that, in the event of a failure, the model