Appendix A: Camera control protocol
125
C
omman
d
s:
N
o
tation
of the
general syn
tax:
y
Al
l
sepa
rat
e
en
ti
ti
es i
n
a
messa
ge ar
e r
e
pr
es
ented be
tween curly
brackets, e.g.
{CR
C
}
y
Literal strings
are be
twe
e
n quo
tes, e.g.
'P
'
y
Logical
entities are neither betw
ee
n bracket
s
no
r quote
s, e.g.
Mi
c.-
No.
(micropho
n
e number)
y
A l
o
g
ic
a
l en
ti
ty
wi
ll
a
lso
co
nta
in
a
nu
mb
er
betwee
n brackets.
This
number states how
many charact
e
rs the
en
ti
ty
ex
ist
s of, e.g.
(4
)
y
If the subtext
1+
is attached to the
entity
between curl
y b
rack
e
ts,
thi
s m
e
ans t
h
at
one
or m
o
re o
ccu
rrenc
e
s
of
thi
s en
ti
ty m
a
y
occu
r
General s
y
ntax
General m
e
aning
E
xamp
les
{'%'}{
'1'}{
'R
'}
{'00'}
{CR
C(4)
}
Th
e
fi
rst mic
rophon
e
is
acti
vated.
%1R0
053
Th
e
first mic
rophon
e
is a
ctivated.
Th
e
camera
control i
s
acti
va
ted.
{'%
'}
{'P'}{
M
ic
.-
No.(4)
}{
CRC(
4)}
The chai
rman un
it is
ac
tivated.
%P000
101
11
The chai
rman un
it is
ac
tivated and
i
t
has
th
e
mi
crophone numb
er
'000
1'.
{'%
'}
{'p'}{
M
ic
.-
No.(4)
}{
CRC(
4)}
Th
e chai
rman un
it is
dea
ctivated.
%p000
101
3
1
The chai
rman un
it '0001
' i
s deacti
va
ted.
{'%
'}
{'M'}{
M
ic
.-
No.(4)
}{
CRC(
4)}
A delegate uni
t
is
acti
va
ted.
%M00
0301
10
A delegate uni
t
is
acti
va
ted
a
n
d it has
the
mi
crophone numb
er
'000
3'.
{'%
'}
{'m'}{
M
ic
.-
No.(4)
}{
CRC(
4)}
A delegate uni
t
is
deact
iv
a
ted.
%m00
0301
30
Th
e delegate un
it
'00
03' is
dea
ctivated.
{'%'}{
'1'}{
'r
'}
{'00'}
{CR
C(4)
}
All acti
ve
mic
rophon
e
s are deac
tivated and
the
cam
e
ra
co
ntrol
s
h
ou
ld
reset
its
e
lf
to
a
neu
tra
l
sta
rt
ing
p
o
si
ti
on.
%1
r00
0052
Th
e
camera
control should
reset
it
self
to
i
ts
sta
rti
ng position.
{'%'}{
'S'}{
M
ic.
-N
o
.(
4)}
1+
{CRC
(4)
}
At
a t
ime in
terval
of a
pprox
.
5 seconds,
a
syn
chroni
z
at
ion
message is sent
to
the c
a
mera
con
trol.
Th
e m
e
ss
ag
e c
o
nt
a
ins
a
ll
the
n
u
m
b
e
rs
of
the
acti
ve m
ic
ro
p
hon
e
s
or
t
h
e
nu
mb
er
0 to
s
ti
p
ul
ate
that
there
are no microphon
e
s a
ctive.
%S00
0301
16
Sy
nchroni
z
a
tion check while
only the delegate un
it
wit
h
the mic
rophon
e
numb
er
'000
3' i
s
acti
ve.
%S0
0020
00300
0402
9C
S
y
n
chro
n
iz
at
io
n
che
ck
w
h
il
e
th
e d
e
le
ga
te
u
n
it
s
'0002'
, '0003
' an
d '0004' are
a
ctive.
{'%'}
{'S'}{
0
(4
)}{
CRC(
4)
}
%S00
0001
13
No mi
crophones are
a
ctive.
{'
%'
}{'V'}
{'000
0'}{C
RC(4
)}
All acti
ve
mic
rophon
e
s are deac
tivated
si
mu
lta
n
eou
sl
y
.
%V00
0001
16
Al
l acti
ve
m
ic
ro
p
hon
e
s are deact
iv
a
ted
si
mu
lta
n
eou
sl
y
.
