---
title: "Command LC"
slug: "command-lc"
updated: 2024-07-04T11:07:49Z
published: 2024-07-04T11:07:49Z
canonical: "docs-linescan.alliedvision.com/command-lc"
---

> ## 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 LC

Command LC is used to switch on or off one or more channel of the XLC4 control unit.

## Structure

| Command | Notes |
| --- | --- |
| CommandID | LC | LC is only available in “Command mode” and “Bulb mode” |
| Parameter | None |  |
|  | Channel |  |
|  | New state |  |
| Parameter | Value | Description |
| None |  |  |
| Channel | “A” | Channel 1 of the XLC4 control unit |
|  | “B” | Channel 2 of the XLC4 control unit |
|  | “C” | Channel 3 of the XLC4 control unit |
|  | “D” | Channel 4 of the XLC4 control unit |
|  | “E” | Corona II module connected to channel 1 |
|  | “F” | Corona II module connected to channel 2 |
|  | “G” | Corona II module connected to channel 3 |
|  | “H” | Corona II module connected to channel 4 |
| New state | “0” | Off |
|  | “1” | On |
| Response |
|  | lc , [channel] , new state |
| General notes |
|  | The new values are applied immediately. If no channel is defined, the command is applied to all 4 channels. From 6.106 with additional function for bulb mode. |

> [!NOTE]
> NOTE
> 
> When using Corona II modules always use the command LC with channel identifiers E, F, G and H.
> 
> Example:
> 
> A Corona II module is connected to the channels A, B and C. The command “LC 1” switches on all 4 channels. XLC4 Commander indicates an error for channel D.
> 
> Use the command “LC E 1”. It switches on only the channels A, B and C. No error is indicated.

## Example

### Without parameter

| Query | Response |
| --- | --- |
| LC | lc 1 1 0 0 |

Responses which channel is on and off.

### With channel parameter

| Query | Action |
| --- | --- |
| LC A 1 | Channel 1 is switched on |

### With new state parameter

| Query | Action |
| --- | --- |
| LC 1 | All LEDs are switched on |
| LC 0 | All LEDs are switched off |