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MVN Analyze: Synchronization Options - TTL

Through the use of the MVN Awinda station you are able to sync with third party devices.  This station provides 4 BNC (2 sync in / 2 sync out) connectors to which third party devices can be connected.

The MVN Analyze sync operates on TTL pulses from 0 - 3.3V and can act as either the master or slave.  The MVN Sync will allow customers to record time synchronized data from multiple third party systems in their own software which can then be exported and analyzed all together.  

Below discusses the options when adding sync configurations and the definitions of those options.

Functions

Start Recording - Upon clicking the record button in MVN, the Awinda station starts the recording and consequently sends/receives a start recording trigger to/from the external system.

Stop Recording - Upon clicking the record button in MVN, the Awinda station stops recording and sends/receives a stop recording trigger to/from the external system.

Go to Operational - A Sync Out trigger on “Go to Operational” is meant to be used for setting the initial signal level on a sync out line.
NOTE: in general, this functionality is not needed since the level is automatically adapted based on the input settings. 

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 - Selecting this option, the frame transition is sent from the moment that a recording is started, which can be used by the external device to capture the timing of the recording in its local time.

LineThe sync line to activate. You can choose from: Sync In 1, Sync In 2, Sync Out 1, Sync Out 2

Polarity  - Positive (where the polarity is initially low [0V] and goes high [3.3V]). Negative (where polarity is initially high [3.3V] and goes low [0V]).

Rising Edge- Detect the polarity change between an initially low V to high V.

Falling Edge - Detect the polarity change between an initially high V to low V.

Falling & Rising Edge- Detect any polarity change between an initially high/low V to low/high V.

 

Skip Factor - Number of sync pulses, between the sync pulses delivered, to skip. 

Skip First - Number of initial sync pulses to skip. This command is useful if a well-defined number of pulses to be skipped 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. i.e. Giving an offset of one sync pulse will ignore the first pulse sent from the third party system

Trigger Once - Only the first trigger event will be sent. It is not recommended to select Trigger once, if more than one recording using synchronization of multiple third party systems will be made.

Example

The below image is an example of what you would see for a rising edge polarity detection setting with a skip factor of one.

The black arrow indicates where the particular function will trigger. If you have indicated that the function for this particular pulse sequence should be start recording, then start recording will be triggered for each instance the pulse and black arrow coincide.

Basic Sync Settings

The descriptions below shows the most common sync settings.

1. These particular settings allow Xsens to act as the Slave Sync System. This means that you will trigger your Xsens recording from your third party system. 

In 1: Start Recording (in)- Polarity Rising Edge / Skip Factor 1 / Skip First 0

In 1: Stop Recording (in)- Polarity Rising Edge / Skip Factor 1 / Skip First 1

2. These particular settings allow Xsens to act as the Master Sync System. This means that you will trigger your third party system from Xsens.

Out 1:Start Recording (out)-Polarity Rising Edge / Skip Factor 1 / Skip First 0 / Pulse Width (ms) 1

Out 1:Stop Recording (out)-Polarity Rising Edge / Skip Factor 1 / Skip First 1 / Pulse Width (ms) 1

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