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OpenSesame Plug-in: Parallel Port Trigger (in Testing)

An OpenSesame Plug-in for sending stimulus synchronization triggers through the parallel port to data acquisition systems.

Copyright, 2016, Bob Rosbag

Contributions: Code is based on the work of Per Sederberg. Debugged and polished by Edwin Dalmaijer.

  1. About

In EEG/ERP studies it is common to send triggers to mark the timestamp for significant events (e.g., the onset of a trial, presentation of a particular stimulus, etc.). Triggers are typically bytes that are sent via the parallel port to data acquisition systems.

The plug-in has four options:

  • Value is a positive integer between 1-255 and specifies the trigger byte
  • Port adress is the hexadecimal value of the parallel port in Windows or the path to the device in Linux.
  • Dummy mode for testing experiments

Linux and Windows are supported (possible also OSX, not tested). For Windows the DLPortIO.dll driver is used to access the parallel port. Install options are listed below.

Installation instructions: http://osdoc.cogsci.nl/devices/triggers/

  1. LICENSE

The Parallel Port Trigger Plug-in is distributed under the terms of the GNU General Public License 3. The full license should be included in the file COPYING, or can be obtained from

Parallel Port Trigger contains works of others. For the full license information, please refer to debian/copyright.

  1. Documentation

Installation instructions and documentation on OpenSesame are available on the documentation website: