> ## Documentation Index
> Fetch the complete documentation index at: https://notevil.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# CAPLfunctionFRTriggerOut

[Open topic with navigation](../../../../../CANoeDEFamily.htm#Topics/CAPLFunctions/FlexRay/Functions/CAPLfunctionFRTriggerOut.md)

# frSetTrigger

[CAPL Functions](../../CAPLfunctions.md) » [FlexRay](../CAPLfunctionsFlexrayOverview.md) » frSetTrigger

[Valid for](../../../Shared/FeatureAvailability.md): CANoe DE

**Note**\
The function is supported by VN interfaces only!

## Function Syntax

`long frSetTrigger( long channel, long portNo );`

## Description

This function activates the Trigger output of the selected VN interface. The VN interfaces provide three different trigger ports. The ports can be set separately.

## Parameters

* **channel**: FlexRay channel (cluster number). The channel number identifies the VN interfaces in case several interfaces are active.
* **portNo**: 1-3: Number of corresponding trigger output. The PIN assignment is defined in the manual of the network interface.

## Return Values

* **0**: Error

## Example

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