Appendix B
B.2 Output of Measurement Data via Ethernet
Identifier Type of data enable/disable in
fr frame counter always enabled
ts timestamp Settings → Output (’ts’)
6dcal additional informations Settings → Output (’6dcal’)
6d/6di standard bodies (6DOF) Settings → Output (’6d / 6di’)
3d additional markers (3DOF) Settings → Output (’3d’)
6df/6df2 Flysticks (6DOF + buttons) Settings → Output (’6df / 6df2’)
6dmt Measurement Tools (6DOF + tip trafo) Settings → Output (’6dmt’)
6dmtr Measurement Tool references (6DOF) Settings → Output (’6dmtr ’)
6dmt2 Measurement Tool with sphere tip (6DOF + tip trafo
+ sphere radius)
Settings → Output (’6dmt2’)
gl/glcal Fingertracking hands (6DOF + fingers) Settings → Output (’gl / glcal’)
B.2.1 Frame Counter
Identifier fr.
This line is always the first one. It carries a frame counter (counting with synchronization
frequency).
Example:
fr 21753
B.2.2 Timestamp
Identifier ts.
A timestamp can be added to each datagram. It shows the time at the measurement of
this frame, i.e. the time when the infrared flash of the cameras is fired. The timestamp
uses the internal clock of the controller, giving back the seconds (with an accuracy of 1µs)
since 00:00 UTC
1
(midnight). This implies that the timestamp value is reset to zero when
passing midnight (UTC)!
i
The timestamp typically shows an accuracy of better than ∆t
err
∼
±0.01ms with a Synccard2 (used in ARTTRACK systems). With a Sync-
cardTP (used in TRACKPACK systems) one can only expect an accu-
racy of ∆t
err
∼ ±0.5ms.
Example:
ts 39596.024831
B.2.3 Standard 6DOF Bodies
Identifier 6d.
Measurement data of all tracked standard 6DOF bodies (i.e. all 6DOF bodies except
1
Coordinated Universal Time = Greenwich Mean Time
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