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Page Revision: 2014/04/13 06:21

NI Port element allows sending and receiving data via digital ports on the National Instruments DAQ cards. The element can be used in standard experimental tasks, for example, for sending synchronization triggers/markers to an EEG recording station.

Table of Contents [Hide/Show] Description Generic Properties

Description ¶

This element shares a working logic with LPT Port element. Check the wiki page of LPT Port element for practical guidance.

Generic Properties ¶

Name	Description	Constraints	Value Type	Upon Runtime Change
Port Settings
Port Name	Defines what NI port is selected for communication	Design Time..	String

+=== Properties inherited from clParallelPortElement === Inherited properties of clParallelPort

Name	Description	Constraints	Value Type	Upon Runtime Change
Port Settings
Working Mode	Defines a working mode for the element.Select the 'Output on event onset' mode for sending signals synchronously with an onset of the parent event,or 'Triggering on input' mode for catching the particular pattern in port input. For custom reading/writing scenarios use the 'Manual IO' mode, in which port communications can be controlled by your code.	Design Time..	Int32
Output
Test Output	Sends a test output signal through the port using the selected signal profile and the current Output Value.	Designtime Command..
Signal Profile	Defines the time-amplitude profile of the output signal. The 'Level Change', 'Pulse' and 'TTL' profiles are available. Last two can be used to send the EEG triggers.		Int32
Preface Duration	Defines the duration (ms) of the guarantied zero preface interval for the TTL or Pulse signals. Increase the preface duration marginally, if your recording hardware does not detect port signals. Note that a non-zero preface delays the onset of the actual signal.		Double
Pulse Duration	Duration of an output pulse in ms. The value is applied only, if the Pulse signal profile is selected.		UInt64
Output Value	Value to be sent through the port. Can be defined in integer or binary format, e.g. Output='01010000'; or Output=255;		clBinaryInteger
Send Now	Runtime command that that initiates an instant transfer of the current output value through the port. Manual command calls at runtime are only required, if the element works in the Manual I/O mode.	Runtime Command..	Boolean	Execute the command by assigning true in code: SendNow=true;
Input
Test Input	Open a input monitor window showing real-time port input with the current settings. Use it for testing at designtime.	Designtime Command..
Input Value	Returns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'.	Status..	clBinaryInteger
Triggering Input	eturns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'.		String
Trigger Once	Returns the current state of the port input lines. The property is not updated automatically. Manual reading of the property value in snippets is required to obtain the current input. The value can be read either to the integer or binary formats, e.g. 'string S=Input;' may return '01010101'	Design Time..	Boolean
Runtime Status
Is Triggered	Indicates whether the element has been triggered at least once, since activation of the parent event. Triggering occurs only in the 'Input Detection' working mode.	Status..	Boolean
Trigger Time	Indicates the local event time of the last element triggering. Triggering occurs only in the 'Input Detection' working mode.	Status..	UInt64

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String