# Using relays on root

**URL:** <https://rootcnc.discourse.group/t/using-relays-on-root/439>\
**Category:** Uncategorized\
**Created:** [25 March 2025 20:31 UTC](https://rootcnc.discourse.group/t/using-relays-on-root/439 "2025-03-25T20:31:43Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![joe](https://avatars.discourse-cdn.com/v4/letter/j/b9e5f3/32.png) [@joe](https://rootcnc.discourse.group/u/joe)\
**Post date:** [25 March 2025 20:31 UTC](https://rootcnc.discourse.group/t/using-relays-on-root/439/1 "2025-03-25T20:31:43Z")

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How do you use the relays on the root controller. What changes are needed in the config and how to call them out in Gcode or m function.

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**Author:** ![sailorpete](https://yyz2.discourse-cdn.com/free1/user_avatar/rootcnc.discourse.group/sailorpete/32/7_2.png) [@sailorpete](https://rootcnc.discourse.group/u/sailorpete)\
**Post date:** [31 March 2025 09:45 UTC](https://rootcnc.discourse.group/t/using-relays-on-root/439/2 "2025-03-31T09:45:58Z")

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Hi Joe,

It depends if the Relay has been associated to a CNC function, like Mist, Flood etc. then these will be turned on and off with their relevant Gcodes.

if you want manual control, please see this page;

> **[User Outputs](http://wiki.fluidnc.com/en/config/user_outputs)**
>
> Configure User Output Signals

specifically the Digital output section