Table Of Contents

Configure Trigger (Configure Pattern Match Advance Trigger) (G Dataflow)

Version:
Last Modified: September 27, 2017

Configures the Advance trigger for pattern match triggering. This node is valid only for acquisition sessions.

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channel list

The channels that are configured for pattern matching using the pattern array value.

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session in

Instrument session obtained from the Initialize Acquisition Session node, the Initialize Generation Session node, or the Initialize External Calibration node.

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error in

Error conditions that occur before this node runs.

The node responds to this input according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Default: No error

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pattern

The binary pattern that activates the pattern match trigger under the conditions specified in trigger when.

This string expression creates a mask for the pattern. This expression is composed of characters:

  • X or x: Ignore the channel
  • 1: Match on a logic 1
  • 0: Match on a logic 0
  • R or r: Match on a rising edge
  • F or f: Match on a falling edge
  • E or e: Match on either edge

The first character in the expression corresponds to the first channel in channel list. The number of characters in pattern must correspond to the number of channels specified in channel list or an error is returned.

Examples of valid expressions

The following two examples are valid and achieve the same results:

  • channel list = 19-0 and pattern = 0000 0XXX XX11 1111 1111
  • channel list = 0-19 and pattern = 1111 1111 11XX XXX0 0000
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trigger when

The conditions under which the trigger is sent.

Pattern matches The trigger is asserted when the sampled pattern matches the pattern specified in pattern.
Pattern does not match The trigger is asserted when the sampled pattern does not match the pattern specified in pattern.

Default: Pattern matches

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session out

Handle that identifies the session in all subsequent node calls.

The session out parameter is obtained from the Initialize Acquisition Session node or the Initialize Generation Session node.

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error out

Error information.

The node produces this output according to standard error behavior.

Standard Error Behavior

Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

error in does not contain an error error in contains an error
If no error occurred before the node runs, the node begins execution normally.

If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

Where This Node Can Run:

Desktop OS: Windows

FPGA: Not supported

Web Server: Not supported in VIs that run in a web application


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