The port_reader plug-in reads input from an arbitrary port, such as a parallel or serial port, and interprets the return value as a participant's response (i.e., a button press).
Dummy mode - If set to 'yes', the keyboard is used instead. Useful for testing purposes.
Port number - The number of the port that you want to use.
Resting state value - The value that should be interpreted as 'no button pressed'.
Correct response - The expected response.
Timeout - The maximum allowed response time, after which a timeout should be signaled.