Waits to receive data at a serial port, then registers a trigger and ends automatically. Most commonly set syncExperiment = <cd>true<cd> to tell the element to synchronize the experiment at trigger, then set the timing of any element in the trial (element properties start/end field t_sync) and/or subsequent trial timing (trial object property start field t_sync) from sync. You can also set any element in the trial to start/end from triggers more generally using element properties start/end fields trigger/TriggerBy.

Trigger value recorded in record property trigger is a row vector of bytes (integers 0–255) received. Trigger time recorded in triggerTime or syncTime is time receive completed relative to trial 1 start.

If you want to set options for the port, you can use pb_prefs → "Other" tab. Or to set for only the current experiment, add an object of type port and set its properties. Typically you don't need to.

Currently portReceiver elements only work with serial ports.

portName

No default

A string that is name of the serial port, as accepted by Psychtoolbox IOPort('OpenSerialPort'). From Psychtoolbox documentation: On Windows this could be, e.g. <cds>"COM1"<cds>, <cds>"COM2"<cds>, etc.; on Mac it is a path to a BSD device file, e.g. <cds>"/dev/cu.usbserial-FT3Z95V5"<cds> for a serial-over-USB device with unique ID FT3Z95V5; on Linux e.g. <cds>"/dev/ttyS0"<cds> for the first real serial port, <cds>"/dev/ttyUSB0"<cds> for the first serial-over-USB device, etc.

numBytes
listenData

Default: wait for any signal of 1 byte

You can set one of numBytes OR listenData to specify what the element waits for to register a trigger and end automatically:

numBytes is number of bytes of any value to receive.

You can set numBytes = <cd>inf<cd> to receive data indefinitely until a condition you set in property end. In this case it never registers a trigger. Currently this only reads data within the trial the element runs in.

listenData is a row vector of byte values (integers 0–255) to listen for. You can specify multiple signals using a cell array of row vectors—the element will then listen for ANY of them.

(None)

data
dataTimes

data is a row vector of bytes received. Just = record property trigger if the element registers a trigger.

dataTimes is a row vector of times bytes were received relative to trial 1 start (sec). As opposed to triggerTime, which is time the last byte was received.