Blackmagicdesign Design 3G-SDI Arduino Shield, Installation And Operation Manual, Page: 187 / 253

185 Studio Camera Control Protocol
0: assign value
The supplied values are assigned to the specified parameter. Each element
will be clamped according to its valid range.
A void parameter may only be “assigned” an empty list of boolean type.
This operation will trigger the action associated with that parameter.
A boolean value may be assigned the value zero for false, and any other
value for true.
1: offset / toggle value
Each value specifies signed offsets of the same type to be added to the
current parameter values.The resulting parameter value will be clamped
according to their valid range.
It is not valid to apply an offset to a void value.
Applying any offset other than zero to a boolean value will invert that value.
Operation types 2 through 127 are reserved.
Operation types 128 through 255 are available for device specific
purposes.
Data (void)
The data field is 0 or more bytes as determined by the data type and
number of elements.
The category, parameter, data type and operation type partition a 24 bit operation space.
Group ID Parameter Type Index Min Max Interpretation
Lens
0
.0 Focus fixed16 – 0.0 1.0 0.0=near, 1.0=far
.1
Instantaneous
autofocus
void – – –
trigger instantaneous
autofocus
.2 Aperture (f-stop) fixed16 – -1.0 16.0
Aperture Value
(where fnumber =
sqrt(2^AV))
.3
Aperture
(normalised)
fixed16 – 0.0 1.0 0.0=smallest, 1.0=largest
.4 Aperture (ordinal) int16 – 0 n
Steps through available
aperture values from
minimum (0) to
maximum (n)
.5
Instantaneous
auto aperture
void – – –
trigger instantaneous
auto aperture
.6
Optical image
stabilisation
boolean – – –
true=enabled,
false=disabled
.7
Set absolute
zoom (mm)
int16 – 0 max
Move to specified focal
length in mm, from
minimum (0) to
maximum (max)
.8
Set absolute
zoom (normalised)
fixed16 – 0.0 1.0
Move to specified
normalised focal length:
0.0=wide, 1.0=tele