---
title: "Frame Start/Actvie (Frametrigger)"
slug: "set-frametrigger"
updated: 2024-09-26T13:41:30Z
published: 2024-09-26T13:41:30Z
canonical: "docs-linescan.alliedvision.com/set-frametrigger"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs-linescan.alliedvision.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Set a frame trigger

## Internal frame trigger

The internal frame trigger provides a continuous signal after each acquired image.

1. In the Configuration window navigate to *Acquisition Control* → *Frame Trigger*.
2. Below *Internal* select the **Generate frame trigger continuously after each acquired image** checkbox.

![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/image-1697450236464.png)

Internal frame trigger

Alternatively, you can set the internal frame trigger in the camera feature tree by executing the following steps:

| Step | Feature name | Value |
| --- | --- | --- |
| 1 | Trigger Selector | FrameActive |
| 2 | Trigger Mode | Off |
| 3 | Trigger Selector | FrameStart |
| 4 | Trigger Mode | Off |
| 5 | Trigger Selector | LineStart |
| 6 | Trigger Mode | Off |

## External frame trigger

The external frame trigger can be provided by a light barrier.

1. In the Configuration window navigate to *Acquisition Control* → *Frame Trigger*.
2. Below *External* select the **Use external source to generate frame trigger** checkbox.

| 1. In *Trigger Selector* select the desired activation mode. Refer to [trigger selector](/v1/docs/set-frametrigger#trigger-selector). 1. In *Trigger Activation* select the desired trigger activation mode. 2. In *Trigger Source* select the desired input Line. Refer to [electrical installation](/v1/docs/evo-electrical-installation#digital-io-port). 3. In *Line Format* select the electrical input signal. Refer to [electrical installation](/v1/docs/evo-electrical-installation#circuit-diagrams). 4. In *Signal detection* select the detection mode. Refer to [trigger signal detection](/v1/docs/set-frametrigger#Trigger-signal-detection-mode). 5. In *Trigger Delay Lines* input the delay of the trigger in lines. | ![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/frametrigger_differential(2).PNG) |
| --- | --- |

Alternatively, you can set the external frame trigger in the camera feature tree by executing the following steps:

| Step | Feature name | Value |
| --- | --- | --- |
| 1 | TriggerSelector | FrameStart, FrameActive or FrameBurstStart |
| TriggerMode | On |
| 2 | TriggerSource | e.g. Line 3 **or** Line 4 |
| 3 | TriggerActivation | level high/level low, rising edge **or** falling edge |
| 4 | TriggerDelayLines | <number of lines> |
| 5 | TriggerSignalDetectionMode | peakholder detection, debouncing 4 clocks, debouncing 4 lines, debouncing 60 lines |
| 6 | Digital I/O Line Selector | select the trigger source |
| 7 | Line Format | open the drop-down menu and change the Line Format to your input signal |

### Trigger Selector

#### Frame start

The *Input signal activation* *→* *Frame start* triggers the image acquisition after the *Trigger delay lines* and depending on the *Trigger signal detection mode* configuration for the duration of the image height setting. One frame trigger creates one image with a constant image height.

![svg-signal diagram-signal frame start_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-signal%20frame%20start_03.svg)

Input signal activation: Frame start

#### Frame active

Note

This configuration is only for the GigE Version available. CxP does not support this configuration.

The *Input signal activation* *→* *Frame active* triggers the image acquisition after the *Trigger delay lines* and depending on the *Trigger signal detection mode* configuration for the duration of the Trigger signal. One Frame trigger creates one image with the length of the frame active signal.

![svg-signal diagram-signal frame active_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-signal%20frame%20active_03.svg)

#### Frame burst start

Note

In *Frame burst start* mode the camera acquires multiple gapless images.

The *Input signal activation* *→* *Frame burst start* triggers the image acquisition after the *Trigger delay lines* and depending on the *Trigger signal detection mode* configuration for multiple times the duration of the image height setting. One frame burst creates multiple images with a constant image height.

The number of acquired images is set under *Acquisistion Control* *→* *Acquisistion Burst Frame Count.*

![svg-signal diagram-frame burst start_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-frame%20burst%20start_03.svg)

Input signal activation: Frame burst

### Trigger signal detection mode

The camera supports four different Trigger signal detection modes. This configuration parameter defines the signal debouncing of the frame trigger input signal.

To set the *Trigger signal detection* navigate to the *camera feature tree* → *Acquisition control* → *Trigger selector*. The following 4 options are available:

#### PeakholderDetection

The *Trigger signal detection mode* *→* *PeakholderDetection* detects every small input signal and starts the image acquisition immediately.

![svg-signal diagram-peakholder detection](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-peakholder%20detection.svg)

#### Debouncing4Lines

The *Trigger signal detection mode* *→* *Debouncing4Lines* requires a 4 line stable trigger input signal, this leads to an image delay of 4 lines.

![svg-signal diagram-4 image lines detection](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-4%20image%20lines%20detection.svg)

#### Debouncing60Lines

The *Trigger signal detection mode* *→* *Debouncing60Lines* requires a 60 line stable trigger input signal, leading to an image delay of 60 lines.

![svg-signal diagram-60 image lines detection](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-60%20image%20lines%20detection.svg)

Debouncing60Lines

#### Debouncing4Clocks (not recommended)

The *Trigger signal detection mode* *→* *Debouncing4Clocks* requires a 4 clocks (clks) stable trigger input signal, leading to an image delay of 4 clocks.

![svg-signal diagram-4 clock pulses_02](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-signal%20diagram-4%20clock%20pulses_02.svg)

Debouncing4Clocks