YS-S4 Multi-rotor Autopilot User Manual V1.4
21
Step
6
Click
"Save
Alignment"
the
dialog
box,
and
click
"OK".
Step
7
Now
the
GCS
software
will
automatically
switch
to
the
“Control”
interface
screen
and
after
a
period
of
calculation
will
display
two
circles,
a
BLUE
one
and
a
RED
one.
The
YS
‐
S4
will
enter
the
magnetic
recording
and
the
LED
will
now
flash
GREEN
.
Calibration
will
be
completed
seconds
later
when
the
GREEN
flash
turns
OFF.
Excellent
OK
Failure
The
circles
are
shown
in
the
picture.
If
the
circles
are
more
or
less
round,
this
means
the
Calibration
has
been
successful.
If
not,
then
you
need
to
do
the
calibration
again.
IMPORTANT:
There
is
no
need
to
do
the
Compass
calibration
every
time
you
fly
or
upgrade
the
firmware
once
your
flight
controller
component
installation
and
compass
calibration
has
been
completed,
but
it
should
be
done
when
components
are
changed
or
if
the
GPS
is
removed.
7.2
Motor
Arming
For
safety
reasons,
the
S4
locks
the
motors
on
landing.
They
can
only
be
re
‐
armed
to
allow
them
to
rotate
and
work
after
carrying
out
the
“arming”
procedure.
IMPORTANT:
Motor
arming
will
fail
if
the
GPS
module
is
not
connected.
Enable
the
“Combined
‐
Stick
‐
Command”
(CSC)
for
motor
arming
as
shown
below:
To
arm,
push
the
left
‐
hand
stick
to
the
far
left
and
extreme
bottom,
the
right
stick
to
the
far
right
and
to
the
bottom.
This
is
for
Japanese
and
American
convention
(mode
1
and
mode
2)
and
is
called
/\
type.
For
Chinese
and
European
operation
(Mode
3
and
Mode
4),
you
need
to
apply
the
\/
type
to
arm
the
motors.
