IMAQ Trigger Drive2 VI - NI-IMAQ VI Documentation

Trigger polarity specifies the polarity of the trigger signal.

The following values are valid:

High True (0)	Drives the line high when the signal is true.
Low True (1)	Drives the line low when the signal is true.

IMAQ Session In identifies the device.

Trigger Type specifies the type of the trigger signal.

The following values are valid:

Note To use the ISO_IN or RS422_IN signals on the NI PCI-1426, select External as the Trigger Type for your function and choose ISO IN or RS-422 as the Signal Level for the trigger line in Measurement & Automation Explorer (MAX).

External (0)	Use an external trigger for the trigger.
RTSI (1)	Use an RTSI line for the trigger.
ISO Out (3)	Use an isolated output for the trigger.

Trigger Number specifies the number of the trigger.

error in (no error) describes error conditions that occur before this VI or function runs. The default is no error. If an error occurred before this VI or function runs, the VI or function passes the error in value to error out. This VI or function runs normally only if no error occurred before this VI or function runs. If an error occurs while this VI or function runs, it runs normally and sets its own error status in error out. Use the Simple Error Handler or General Error Handler VIs to display the description of the error code. Use error in and error out to check errors and to specify execution order by wiring error out from one node to error in of the next node.

	status is TRUE (X) if an error occurred before this VI or function ran or FALSE (checkmark) to indicate a warning or that no error occurred before this VI or function ran. The default is FALSE.
	code code is the number identifying an error or warning. If status is TRUE, code is a non-zero error code. If status is FALSE, code can be zero or a warning code. Use the error handler VIs to look up the meaning of this code and to display the corresponding error message.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.

Trigger drive specifies the signal that drives the trigger line.

The following values are valid:

Note Frame Start and Frame Done are not supported for line scan applications

Disabled (0)	The trigger line is disabled.
Acquisition in Progress (1)	Asserts when an acquisition is in progress.
Acquisition Done (2)	Asserts when the entire acquisition is completed.
Pixel Clock (3)	Specifies the pixel clock as the signal that drives the trigger line.
Unasserted (4)	Forces the trigger to its unasserted state as defined by Trigger Polarity.
Asserted (5)	Forces the trigger to its asserted state as defined by Trigger Polarity.
Horizontal Synchronization Signal (6)	Asserts a horizontal synchronization signal at the beginning of each line by the camera.
Vertical Synchronization Signal (7)	Asserts a vertical synchronization signal at the beginning of each frame by the camera. This value is not applicable to line scan acquisitions.
Frame Start (8)	Asserts when a frame is being captured.
Frame Done (9)	Asserts at the end of each frame that is captured.
Scaled Encoder (10)	Pulses for cumulative forward movement of encoder Phase A and Phase B signals after applying a scaling factor.

IMAQ Session Out has the same value as IMAQ Session In.

error out contains error information. If error in indicates that an error occurred before this VI or function ran, error out contains the same error information. Otherwise, it describes the error status that this VI or function produces. Right-click the error out indicator on the front panel and select Explain Error from the shortcut menu for more information about the error.

	status is TRUE (X) if an error occurred or FALSE (checkmark) to indicate a warning or that no error occurred.
	code is the error or warning code. If status is TRUE, code is a nonzero error code. If status is FALSE, code is 0 or a warning code.
	source describes the origin of the error or warning and is, in most cases, the name of the VI or function that produced the error or warning. The default is an empty string.