---
title: "Each line Infoblock description"
slug: "each-line-info-block"
updated: 2026-09-02T05:51:29Z
published: 2026-09-02T05:51:29Z
canonical: "docs-linescan.alliedvision.com/each-line-info-block"
---

> ## 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.

# Read each line info block

## Decoding of the each line info block

| Pixel | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Red | Marker | Error code | Speed2high | Encoder clocks | Next line position | Time stamp | Unsupported | Unsupported | Unsupported | Marker |
| Green | Continuous line count | Line count | Line time |
| Blue |

## Continuous line count

This counter increments by 1 for each row of the image. The counter continues counting for new images and is not reset. It can be used to detect missing image information.

### Structure

|  | Continuous line count |
| --- | --- |
| – | Byte 1 | Byte 0 |
| Px0Red | Px0Green | Px0Blue |

### Decoding

**The decoding of the continuous line count is:**

Clc = Px0Green × 256 + Px0Blue

**Example**

Clc = 217 × 256 + 127 = 55679

![svg-read each line-continuous line count_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20each%20line-continuous%20line%20count_03.svg)

Example: Decoding of continuous line count

## Line count

This counter increments by 1 for each row of the image. The counter starts counting at 0 for each image. It can be used to detect missing image information.

### Structure

|  | Line count |
| --- | --- |
| – | Byte 1 | Byte 0 |
| Px1Red | Px1Green | Px1Blue |

### Decoding

**The decoding of the line count is**

Lc = Px1Green × 256 + Px1Blue

**Example**

Lc = 0 × 256 + 0 = 0

![svg-read each line-line count_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20each%20line-line%20count_03.svg)

Example: Decoding of line count

## Speed too high

This information can be used to check if the speed of the line trigger signal is too high for the camera. In this case, the camera switches to freerun and acquires with the maximum possible speed. This state must be avoided because the transport resolution of the image is not constant. If the flag is “True” for some lines there are the following options to avoid this issue.

The speed too high state can be caused by two parameters

- Exposure time (Exposure time ≥ Line time - 2us offset) *Compare the exposure time with the info block information “line time“ to check if the exposure time is the limiting factor.*
- Interface speed

To avoid the speed too high state there are multiple options.

- Reduce the transport speed if possible.
- If the info block information “line time“ oscillates heavily check the electrical connection or try to stabilize the mechanical transportation process.
- If the exposure time is the limiting factor reduce the exposure time.
- If the interface speed is the limiting factor, increase the interface speed is possible (Use more CXP lanes or a faster CXP type / Use dual 10GigE)

### Structure

| Speed2high | – |
| --- | --- |
| Bit 7 | Bit 6 – Bit 0 |
| Px2Red |

## Line time

This information represents the line time. For an operation without a line trigger, this variable is constant and equal to the camera parameter line time. If the camera is triggered with a line trigger this information can be used to check the signal/mechanical transport quality.

- If the signal oscillates very heavily with a high frequency the electrical connection is not OK.

![](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/grafik(1).png)

- Small oscillations (for example +-20%) are most probably mechanical vibrations in the transport process. These effects are typical for:
  - Belt drives
  - Conveyor belts
  - Low-quality linear stages for scans with a high resolution.

### Structure

|  | Line time clocks |
| --- | --- |
| Bit 7 – Bit 4 | Bit 3 – Bit 0 | Byte 1 | Byte 0 |
| Px2Red | Px2Green | Px2Blue |

### Decoding

**The decoding of the line time is:**

Lt = (Px2Red × 216 + Px2Green × 28 + Px2Blue) / 100

**Example**

Lt = (0 × 216 + 21 × 28 + 124) / 100 = 55 µs

![svg-read each line-line time_03](https://cdn.document360.io/eca58697-9c2f-461e-9f0a-e6205b74b693/Images/Documentation/svg-read%20each%20line-line%20time_03.svg)

Example: Decoding of line time

## Encoder clocks

### Structure

| Encoder clocks |
| --- |
| Byte 2 | Byte 1 | Byte 0 |
| Px3Red | Px3Green | Px3Blue |

### Decoding

**The decoding of the encoder clocks is:**

Ec = Px3Red × 216 + Px3Green × 28 + Px3Blue

## Next line trigger position

### Structure

| Next lt pos raw |
| --- |
| Byte 2 | Byte 1 | Byte 0 |
| Px4Red | Px4Green | Px4Blue |

### Decoding

**The decoding of the encoder clocks is:**

Nlp = (Px4Red × 216 + Px4Green × 28 + Px4Blue) / 256

## Time stamp

### Structure

| Time [s] | Time [¼ ms] |
| --- | --- |
| Byte 2 | Byte 1 | Byte 0 |
| Px5Red | Px5Green | Px5Blue |

### Decoding

**The decoding of the time stamp is:**

Ts = (Px5Red × 216 + Px5Green × 28 + Px5Blue) / 4