---
title: "Command FA"
slug: "command-fa"
updated: 2024-07-04T11:08:16Z
published: 2024-07-04T11:08:16Z
canonical: "docs-linescan.alliedvision.com/command-fa"
---

> ## 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.

# Command FA

Command FA is used to set the content of the control register *“ControlFlagsA”.*

## Structure

| Command | Notes |
| --- | --- |
| CommandID | FA | Only available in Command mode |
| Parameter | None |  |
|  | Register value | HexChar |
| Parameter | Value | Description |
| None |  | The current value is queried |
| Register value | 0x0000 |  | Default value |
| 0x0001 | Service | For service use only – set to 0 |
| 0x0002 | Internal | For internal use only – set to 0 |
| 0x0004 | ActSW | XLC4-1 and XLC4-1A: Activate use of Switch (SW1 to SW2 at connector X6) |
| 0x0008 | ActVO | Activate use of VOUT (VOUT at connector X5) |
| 0x0010 | CheckFan | Supervise Fan-valid signal (ACNTRL at connector X5) |
| 0x0020 | Enable ON | Activates flash function (Signal ON at connector X6) |
| 0x0200 | Channel control mode | XLC4-1F4: All channels are controlled independent from the inputs at X6 |
| Response |
|  | fa , space , register value |
| General notes |
|  | The register value is applied after switching on again. Combinations of single flags are possible. |

## Example with Register value

| Query | Response |
| --- | --- |
| FA 0x000C | fa 0x000C |

Activates VOUT and SW1-SW2 for cooling device.

| ControlFlagA HexChar | Reserved | Reserved | EnableON | CheckFan | ActVO | ActSW | Internal use | Service | Description |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 0x0000 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | ON disabled, no FAN control or external cooling device control |
| 0x0004 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | ON disabled, Standard mode with cooling device at SW1-SW2 |
| 0x0008 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | ON disabled, Standard mode with Fan at VOUT |
| 0x000C | 0 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | ON disabled, VOUT and SW1-SW2 active for cooling device |
| 0x0020 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | Switching XLC4 with ON-Input - no cooling device connected |
| 0x0024 | 0 | 0 | 1 | 0 | 0 | 1 | 0 | 0 | Switching XLC4 with ON-Input - cooling device at SW1-SW2 |
| 0x0028 | 0 | 0 | 1 | 0 | 1 | 0 | 0 | 0 | Switching XLC4 with ON-Input - Fan at VOUT |
| 0x002C | 0 | 0 | 1 | 0 | 1 | 1 | 0 | 0 | Switching XLC4 with ON-Input - VOUT and SW1-SW2 active for cooling device |
| 0x0018 | 0 | 0 | x | 1 | 1 | x | 0 | 0 | Activating the fan monitoring functions |