User's Manual

Document MV0319P.N
© Xsens Technologies B.V.
MVN User Manual
142
23.3 Sync Out
Sync Out is the command that enables the Xsens system to send a trigger pulse for synchronization
purposes. A control signal is sent via the Awinda/Sync Station, from MVN Studio to the third party
hardware.
Sync Type
Description
Start Recording
Upon clicking the record button in MVN Studio, the Awinda Station starts the
recording and consequently sends a start recording trigger to the third party
system.
Stop Recording
Upon clicking the record button in MVN Studio, the Awinda Station stops
recording and sends a stop recording trigger to the third party system.
Go to Operational
The default polarity of the output line is always low. However, for input
triggers that assume high polarity, the polarity of the line must be set high
beforehand. This becomes possible, using 'Go to operational'. When ‘Go to
Operational’ is selected on the same line as the assumed high polarity, the
polarity is changed to high, preparing the system for sync.
Interval Transition
Measurement
A frame / or interval transition at the Station can be used to give a signal to
the external system, indicating the end of the strap-down integration interval
over which data is calculated. Selecting this option, the frame transition is
sent from the moment that “Start Measuring” is selected.
Interval Transition
Recording
See Frame transition Measurement
Selecting this option, the frame transition is sent from the moment that a
recording is started. This is a very useful option to implement, to ensure that
during a recording, the clocks of the synchronized systems are known,
ensuring that any drift can be compensated for.
A number of parameters can be set for each action:
Parameter
Description
Sync Line
The sync line to activate.
Pulse Polarity
Positive pulse (where the polarity is initially low [0V] and goes high [3.3V]).
Negative pulse (where polarity is initially high [3.3V] and goes low [0V]).
Trigger Once
It is not advised to select Trigger once, if more than one recording using
synchronization of multiple systems will be made.
Skip First
Number of initial sync pulses to skip. This command is useful if a well-defined
delay is expected between the Xsens and the third party system. It may also
be needed if the third party, like the Xsens system uses the same pulse
properties to trigger different actions. See description provided above for
Sync In.
Skip Factor
Number of sync pulses, between the sync pulses delivered, to skip. See
Sync In Table description.
Pulse Width
Some systems wait for a signal of a minimum pulse width before generating
the desired synchronization action. The Awinda / Sync Station can send a
pulse with a duration of up to 99ms to a third party system. It is not
recommended to send a signal longer than a frame width.
Specify 0 ms to generate an infinite pulse width.