Pike
Technical
Manual
V5.2.3
187
Controlling image capture
Controlling
image
capture
ISO_Enable / free-run
Setting
the
MSB
(bit
0)
in
the
614h
register
(ISO_ENA)
puts
the
camera
into
ISO_Enable
mode
or
Continuous_Shot
(free-run).
The
camera
captures
an
infinite
series
of
images.
This
operation
can
be
quit
by
deleting
the
0
bit.
Asynchronous broadcast
The
camera
accepts
asynchronous
broadcasts.
This
involves
asynchronous
write
requests
that
use
node
number
63
as
the
target
node
with
no
acknowledge.
This
makes
it
possible
for
all
cameras
on
a
bus
to
be
triggered
by
software
simultaneously
-
e.g.
by
broadcasting
a
one-shot.
All
cameras
receive
the
one-
shot
command
in
the
same
IEEE1394
bus
cycle.
This
creates
uncertainty
for
all
cameras
in
the
range
of
125
µs.
Inter-camera
latency
is
described
in
188.
The
following
screenshot
shows
an
example
of
broadcast
commands
sent
with
the
Firedemo
example
of
FirePackage:
•
Line
1
shows
the
broadcast
command,
which
stops
all
cameras
connected
to
the
same
IEEE1394
bus.
It
is
generated
by
holding
the
<shift>
key
down
while
clicking
on
<Write>.
•
Line
2
generates
a
broadcast
one_shot
in
the
same
way,
which
forces
all
connected
cameras
to
simultaneously
grab
one
image.
Figure 82: Broadcast one-shot