Chapter 5
5.3 Installation of the TRACKPACK Controller (discontinued)
system are also using infrared signals for controlling their equipment (e.g. if IR-controlled
shutter glasses are used). The goal is to reduce or eliminate interference. The TRACK-
PACK tracking system follows the external synchronization signal and chooses time slots
when it is safe to emit infrared radiation without causing interference. The effect is, for ex-
ample, that active shutter glasses are not flickering but offer a stable picture for the user.
Z
The external sync input is not internally terminated.
When synchronizing with a video input, a tee-connector with an exter-
nal 75Ω terminating resistor should be used if the signal line ends at
the controller.
When using a TTL-signal you should not use a terminating resistor.
However, you should use a shielded cable for the synchronization with
a TTL-signal.
Be aware of the following specialty of the TrackPack system:
The TRACKPACK cameras get power supply and sync via the RJ45
cable!
Therefore, the status of the synchronization is indicated with two LEDs (orange and green)
located on the synccard of the controller. Depending on the operating condition of the
ART tracking system the LEDs are triggered respectively. Table 5.2 shows how the LEDs
are triggered according to the type of synchronization.
two LEDs (on each port of the camera network card)
↓ ↓
orange green
↓ ↓ ↓ ↓
ON OFF ON OFF
↓ ↓ ↓ ↓ ↓
flashing
permanently
lit
measurement
inactive
controller
switched ON
controller
switched OFF
↓ ↓
master (sync
source)
slave (sync
drain)
Status
Table 5.2: Description of the LEDs on the back of the TRACKPACK Controller
65
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