GCode Symbols.. What do they mean?

vanhattentrees · September 1, 2023, 12:54pm

I dont understand what certain symbols mean or represent such as $

JohnJohn · September 1, 2023, 1:18pm

For a GRBL machine the $ codes are internal settings along with some commands that talk to the engraver.

GRBL is Open Source, it is well documented.

gnea/grbl/blob/master/doc/markdown/settings.md

## Getting Started

First, connect to Grbl using the serial terminal of your choice.

Set the baud rate  to **115200** as 8-N-1 (8-bits, no parity, and 1-stop bit.)

Once connected
 you should get the Grbl-prompt, which looks like this:

```
Grbl 1.1d ['$' for help]
```

Type $ and press enter to have Grbl print a help message. You should not see any local echo of the $ and enter. Grbl should respond with:

```
[HLP:$$ $# $G $I $N $x=val $Nx=line $J=line $SLP $C $X $H ~ ! ? ctrl-x]
```

The ‘$’-commands are Grbl system commands used to tweak the settings, view or change Grbl's states and running modes, and start a homing cycle. The last four **non**-'$' commands are realtime control commands that can be sent at anytime, no matter what Grbl is doing. These either immediately change Grbl's running behavior or immediately print a report of the important realtime data like current position (aka DRO).

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You’ve sent this to me as a direct message. Would you be comfortable if I took your first question and shared it with a larger audience (here publicly)?

it’s a good thing to know and to share the definitions of the Symbols. If more people can see the confusion or absent information the faster the community can help.

vanhattentrees · September 2, 2023, 9:46am

yes, please share the info. thank you for the reply. it’s still kind of above my head, but as I understand it I dont need to worry about anything as long as everything is working as it should. thanks again.

system · October 5, 2023, 1:15pm

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