Blackmagic Studio Camera Manual Del Usuario página 28

Developer Information
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128: signed 5.11 fixed point
Data elements are signed 16 bit integers representing a real number with
5 bits for the integer component and 11 bits for the fractional component.
The fixed point representation is equal to the real value multiplied by 2^11.
The representable range is from -16.0 to 15.9995 (15 + 2047/2048).
Data types 129 through 255 are available for device specific purposes.
Operation type (uint8)
The operation type specifies what action to perform on the specified
parameter. Currently defined values are:
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.