Owner's manual

Vinten Broadcast Ltd
free-d™ Installation Manual V1.4.4
Page 33 of 46
The DSP status is a signed 8-bit number which when negative indicates an
error condition as follows:
-1 Too few valid targets visible to compute camera position.
-2 Iteration failed to converge.
-3 A DSP reset occurred.
-4 Internal DSP error.
A zero or positive value of DSP status indicates the number of iterations which
were required to compute the camera's position.
A.3.4 Type D3 - control parameters
The D3 message is used for transferring the control parameters. It may be
sent to the free-d™ unit in order to set their values, or requested from the free-d™
unit in order to interrogate the current values. Operation of switch S4 saves
the current values to EEPROM, which become the default values following a
subsequent processor reset.
The message contains 13 bytes as follows:
<D3> Message type
<CA> Camera ID
<SN> Studio ID
<SM> Smoothing value
<HI> Maximum asymmetry
<HO> Half box width
<BT> Black video threshold
<WT> White video threshold
<BC> Black video clip level
<WC> White video clip level
<MB> Maximum number of >black pixels between boxes
<MW> Minimum number of >white pixels in inner box
<CK> Checksum
The ‘studio ID’ is in the range 0 to 255 and determines which database of
target positions (stored in the on-board EEPROM) is used.
The ‘smoothing value’ is in the range 0 to 255, corresponding to settings of
smoothing between 0.000 and 0.996.
The ‘maximum asymmetry’ is in the range 0 to 255, in units of 1/128 pixels.
This sets a limit on the difference between the centre position of a target as
measured by the hardware and its position as estimated as the mid-point
between opposite edges.