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Alpha Version of the BIOSEMI acquisition module.




Samuel A. Inverso (, Yang Zhen

Version History

Revision 1.2 2005/12/14 15:24:15 mellinger: Fixed state name typo in Process(). Revision 1.1 2005/12/12 00:05:24 sinverso: Initial Revision: Working and tested offline. Not tested in real experiments.

Source Code Revisions

  • Initial development: 960
  • Tested under: --
  • Known to compile under: 1658
  • Broken since: --

Functional Description

Acquires from a Biosemi Act2. Tested with a MK1, may work on a MK2.

Converts the signal to microvolts before sending it.

In Source parameters you can set the module to postfix the BIOSEMI trigger channels after the signal channels. i.e. if you acquire 64 channels of EEG, and set postfix to true, channels 0 to 63 will be EEG and channels 64 to 79 will be trigger channels 0 to 15. Warning: If postfix trigger channels is 0, the trigger values will not be saved in the data files and are not recoverable.


Copy the Labview_DLL.dll to the prog directory for the module to work.


As of version 2.0 (svn revision 2189) the old parameters PostFixTriggers and TriggerScaleMultiplier have been removed. The functionality of the former is replaced by TriggerChList and the latter can be simulated by setting the corresponding elements of SourceChGain accordingly.


A list of (one-based) indices to the EEG channels to be acquired. If there are n indices in this list, then the first n channels will be EEG channels.


A list of indices (each in the range 1 through 32 inclusive) indicating which Analog Input Box channels are to be acquired. By default, none are acquired. AIB channels are postfixed immediately following the EEG channels.


The old PostfixTriggers parameter has been replaced by this, a list of indices (each in the range 1 through 16 inclusive) indicating which one-bit trigger channels to postfix after the EEG and AIB channels). By default, all 16 are postfixed.



Set to 1 when hardware reports low battery state.


The mode corresponding to the one on the front of the Biosemi box.


Set to 1 when connected to an MK2.

See also

User Reference:Filters, Contributions:ADCs