Table Of Contents

Previous topic

Movie Component

Next topic

Patch (image) Component

This Page

Quick links

Parallel Port Out Component

This component allows you to send triggers to a parallel port or to a LabJack device.

An example usage would be in EEG experiments to set the port to 0 when no stimuli are present and then set it to an identifier value for each stimulus synchronised to the start/stop of that stimulus. In that case you might set the Start data to be $ID (with ID being a column in your conditions file) and set the Stop Data to be 0.


: string
Everything in a PsychoPy experiment needs a unique name. The name should contain only letters, numbers and underscores (no punctuation marks or spaces).
Start :
The time that the stimulus should first appear. See Defining the onset/duration of components for details.
Stop :
Governs the duration for which the stimulus is presented. See Defining the onset/duration of components for details.
Port address
: select the appropriate option
You need to know the address of the parallel port you wish to write to. The options that appear in this drop-down list are determined by the application preferences. You can add your particular port there if you prefer.
Start data
: 0-255
When the start time/condition occurs this value will be sent to the parallel port. The value is given as a byte (a value from 0-255) controlling the 8 data pins of the parallel port.
Stop data
: 0-255
As with start data but sent at the end of the period.
Sync to screen
: boolean
If true then the parallel port will be sent synchronised to the next screen refresh, which is ideal if it should indicate the onset of a visual stimulus. If set to False then the data will be set on the parallel port immediately.

See also

API reference for iolab