Техническая Спецификация для Graupner Hendheld RC 2.4 GHz No. of channels: 8 33116

136 Program description: Fail-Safe

FAIL SAFE

Pos

hold

1 2 3 4 5 6 7 8

Delay  0.25s

STO

The inherently higher operational security of the HoTT 
system compared with classic PPM technology is due 
to the ability of the HoTT receiver’s integral micro-proc-
essor to process the signals from “its” transmitter ex-
clusively, and also to process any “dirty” control signals 
which it picks up. The receiver constantly stores the 
latest valid signals, and invalid signals are automatically 
replaced by the stored signals - but only if the control 
signal is seriously inaccurate or even damaged, e. g. due 
to interference from an outside source. This process is 
dependent upon various settings which are described 
later in this section. For example, the receiver sup-
presses brief interference such as field strength “holes” 
and similar effects which would otherwise result in the 
familiar “glitches”. When this happens, the red LED on 
the receiver lights up.
If you have not yet programmed any Fail-Safe settings 
in the currently active model memory, the following 
warning display will appear in the basic display for a few 
seconds when you switch the transmitter on:

fail safe

setup

t.b.d

Programming
The “Fail-Safe” function determines the receiver’s beha-
viour when interference occurs in the transmission from 

transmitter to receiver. The receiver outputs 1 … 8 can 
optionally …

maintain (“hold”) their current position:

1. 

If interference should occur, all servos programmed 
to “hold” mode remain at the position last assessed 
by the receiver as correct until such time as a new, 
correct control signal arrives at the receiver, or
move to a user-selectable position (“Pos”) if interfer-

2. 

ence occurs, after a “delay” time has elapsed.

Use the arrow buttons  of the left or right-hand 
touch-key to select the desired servo socket 1 to 8 (



), 

then touch the central 

 button of the right-hand 

touch-key to switch between “hold” ( ) and “position” ( )  
mode:

FAIL SAFE

Pos

1 2 3 4 5 6 7 8

STO

hold

Delay  0.25s

Now select the “Delay” option at bottom left of the 
screen using the arrow buttons  of the left or right-
hand touch-key …

FAIL SAFE

Pos

1 2 3 4 5 6 7 8

STO

hold

Delay  0.25s

… touch the central 

 button of the right-hand touch-

key, and use its arrow buttons to select your preferred 
delay period from the four on offer (0.25 s, 0.5 s, 0.75 s 

and 1 s).
Simultaneously pressing the arrow buttons  or  
of the right-hand touch-key (

CLEAR) resets the high-

lighted field to the default value of 0.75 s.
Now use the arrow buttons  of the left or right-hand 
touch-key to select the 

STO field at bottom right of the 

screen; SIMULTANEOUSLY move the servos for which 
you have selected Position mode to the desired posi-
tions using the associated transmitter controls.
A touch of the central 

 button of the right-hand 

touch-key stores these positions in the receiver as the 
Fail-Safe settings, so that it can revert to these if interfer-
ence should strike.
The transmitter informs you of the stored data by briefly 
displaying:

FAIL SAFE

Pos

1 2 3 4 5 6 7 8

STO

Position

stored

hold

Delay  0.25s