GRBL Based Controller - Modified

[Maple_Dude]

Hey, 

   I've got a GRBL controller for my PnP, not using the "https://github.com/openpnp/grbl" release, that appears to connect and move around when I tell it to jog. However, when I send it a second jog command, it complains "Timeout Waiting for Response to M400: Wait for moves to complete before returning". So I shuffled through the forum for more information and found a few entries. However: 

1. Increasing the command timeout does not response the problem, it just delays how long before the error appears

2. When I send my GRBL "M400" command, it gives me "error 23" as response, and when I look online, I don't see M400 as a defined command for GRBL...

so... What do I do? Is the problem on OpenPnP side? Is it on GRBL Side? Is GRBL not sending back the confirmation properly? It seems to me that it should recognize M400 - but since there is the "https://github.com/openpnp/grbl" page, that suggests to me that GRBL should be able to respond correctly, unless there are more modifications to the GRBL posted online than just 3->4 axis?

I'm scratching my head on this one. 

thanks

[James Shelby]

This may or may not help.

https://groups.google.com/forum/#!topic/openpnp/X3tj8LStGvU  

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[bert shivaan]

Dont send the M400. It is not needed with GRBL as far as I can tell. GRBL will send "OK" when it is done, so in your move ommand, have it send G4P0 as the last thing. GRBL will not respond to the G4P0 until it is finished moving.

[Maple_Dude]

That seems to have done the trick - thank you.