User's Manual

Document MV0319P.N
© Xsens Technologies B.V.
MVN User Manual
144
frames since data received in a given frame is measured in the previous one. Therefore, delaying the
recording in this way ensures that data is not recorded prior to the external trigger indication.
In the same way, recording should not be stopped between frames, since data received in a given frame
was measured during the previous frame. Therefore, the Awinda Station stops recording immediately
after the current frame.
23.4.1 Sync In Recommended Settings
Note that the preferences menu includes “Skip first” and “Skip Factor”. The definitions of these have
been provided above; however for practical use consider the following:
When the Awinda Station is triggered to start and stop a recording, on one line, it will blindly receive
3.3 V pulses on that line. Since all pulses are the same, the Station requires further instructions about
what to do with each pulse. In the software, a translation has been put in place to carry out a certain
action with each pulse.
Therefore, to start a recording, one must give an initial pulse. The second pulse, should indicate a stop
recording, therefore the skip factor in “Start Recording” should be set to 1. In Stop Recording, the first
pulse should not trigger a stop (it was just used to Start Recording); so a Skip First of 1 must be input,
and to ensure that every other pulse thereafter stops the recording, a Skip Factor of 1 must be input.
This means that Start Recording is commanded on pulse 1, 3, 5 etc and stop recording on 2, 4, 6 etc.
23.5 Sync In with MVN Studio
When Sync In is in use, after configuration, and when ready to record, users should click Record, to
prepare the system for the external trigger. The record icon changes from the normal red dot to one with
the pause symbol overlaid. When recording has been triggered by the external system, the record button
will indicate as such (most right icon shown below):
Record button prior to
depression
Record button when depressed
and waiting for Sync In signal
Record button during recording
(and temporarily during
flushing)
23.6 Sync Out with MVN Studio
When the parameters have been set for MVN Studio to control the start and stop of recordings, each
time the record button in MVN Studio is depressed, a TTL pulse will be sent to the specified Sync Line.
The receiving system must be configured to take the specified action.
Of course, ensure that the BNC connector is connected to the correct Sync Out line(s).