... its a common G-code (or more precise, "M"-code), so it will be send together with all other G-codes.
Depending on your software you can create a user button for switching it manually or a macro to implement it "automatically" with the normal G-code ...
Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [
reprap.org] -- Deutsche Facebook-Gruppe - [
www.facebook.com]
Call for the project "garbage-free seas" - [
reprap.org]