- 5 -
movement, and continues to move along that trajectory. When the position is confirmed, or
changed, the camera makes the appropriate adjustment to the trajectory and then predicts the
next position.
The
PMS
routine also predicts when to expect a position update, based on the previous
frequency of positional data packets. If a new position does not arrive within the predicted
window the
PMS
predicts further ahead to continue a smooth move even if the data packet is
missing or corrupted.
The
PMS
routine achieves a far more natural movement of the camera as it tends to follow the
artist’s actual move in real time, not wait at the artist’s previous position until moving to the
next position, when it would always be behind the action.
DMX Settings
The camera uses 8 DMX channels for full DMX control;
•
Ch1 (Base)
-
Pan position coarse (8bits)
•
Ch2
-
Pan position fine (8bits)
•
Ch3
-
Tilt position coarse (8bits)
•
Ch4
-
Tilt position fine (8bits)
•
Ch5
-
Zoom position coarse (8bits)
•
Ch6
-
Zoom position fine (8bits)
•
Ch7
-
Focus (8bits)
•
Ch8
-
Iris (8bits)
The factory HOME position is camera forwards and horizontal.
HOME position is not required for
Camball4 VR
because
absolute encoders are fitted to the
shafts.
The DMX Base address can be cycled
Up
or
Down
to set the Base Address. When the desired
Base Address is shown
– push the ‘Set’ button.
Free-D & Mstar control
When in
Free-D
or
Mstar
mode, the
CamBall4
outputs continuous metadata in
Free-D
(D1
format) or
Mstar
format. A
Free-D
cable is supplied with the camera. The metadata contains
24bit position data for Cam ID, Pan, Tilt, Zoom & Focus, plus genlock status. (Internally the
camera only uses 16bits). The same
Free-D
data format is used as a control input. Free-D
output can be in
Angular
or
RAW
format. The RAW format is the absolute 16bit position.
The angular output is calculated from this so is slightly less accurate. For more information
about
Free-D
protocols see separate documents.
The type of Free-D metadata can be changed from the
Multi Function Controller
. This can
be Angular or RAW.
When no genlock input is present the camera sends the metadata at either 50Hz or 60Hz,
depending on the selected camera output standard. It is timed with the video frames.