User's Manual

116
Program description: Fail-Safe
FAIL SAFE
Pos
hold
123
4
5
6
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 fi eld 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 … 6 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 ef of the left or right-hand
four-way button to select the desired servo socket 1 to 6
(
z), then press the central SET button of the right-hand
four-way button to switch between “hold” ( ) and “posi-
tion” ( ) mode:
FAIL SAFE
Pos
123
4
5
6
STO
hold
Delay 0.25s
Now select the “Delay” option at bottom left of the
screen using the arrow buttons ef of the left or right-
hand four-way button …
FAIL SAFE
Pos
123
4
5
6
STO
hold
Delay 0.25s
… press the central SET button of the right-hand four-
w
ay button, 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 cd or ef
of the right-hand four-way button (CLEAR) resets the
highlighted fi eld to the default value of 0.75 s.
Now use the arrow buttons ef of the left or right-hand
four-way button to select the STO fi eld at bottom right
of the screen; SIMULTANEOUSLY move the servos for
which you have selected Position mode to the desired
positions using the associated transmitter controls.
A press of the central SET button of the right-hand four-
w
ay button 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 briefl y
displaying:
FAIL SAFE
Pos
123
4
5
6
STO
Position
stored
hold
Delay 0.25s
Caution:
W
e strongly recommend that you make use of the
safety potential of this option by at least setting the
throttle position (glow-powered models) to idle, or
the electric motor to stop, if a fail-safe event should
be triggered. Model helicopters should be pro-
grammed to “hold”. This simple precaution ensures
that the model is much less likely to cause havoc
and cause property damage or personal injury.
Fail-Safe
33112_mx12_HoTT_2_GB.indd Abs40:11633112_mx12_HoTT_2_GB.indd Abs40:116 06.06.2011 19:39:4206.06.2011 19:39:42