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.

Properties

Name

: 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