---
title: "Command SD"
slug: "command-sd"
updated: 2024-07-04T11:08:13Z
published: 2024-07-04T11:08:13Z
canonical: "docs-linescan.alliedvision.com/command-sd"
---

> ## 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 SD

Command SD is used to activate the SHUTDOWN input. The shutdown function is not intended to be used for switching off in regular operations. This function is intended for safe hardware shutdown of the XLC4 control unit and the Corona II module.

## Structure

| Command | Notes |
| --- | --- |
| CommandID | SD | Works in all XLC4 operating modes |
| Parameter | None |  |
|  | New state |  |
| Parameter | Value | Description |
| New state | “0” | Shutdown deactivated (default) |
|  | “1” | Shutdown activated for all channels |
| Only for firmware release from 5.12 |
| None |  | The current value for New state is queried in hex format |
| New state | “0xF” | Shutdown deactivated (default) |
|  | “0x0” | Shutdown activated for all channels |
|  | “W” | Stores the current value in hex parameters |
| Response |
|  | sd , space , New state |
| General notes |
|  | Up to firmware release 4.26: - The new value is applied after switching on again From firmware release 5.12: - The new value for the commands “SD 1” and “SD 2” is applied after switching on again - Save the new value in hex parameters (for example “SD 0xF) with the command “SD W”. Otherwise changes are lost after switching on again. |

## Example

### With New state

| Query | Response |
| --- | --- |
| SD 1 | sd 1 |
| SD 0xF | sd 0xf |

The shutdown is activated.