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It's an old o-scope and has seen better days (like the owner ...). The DM542T driver doesn't have LEDs - wish they did now.

I'm going to switch to UGS Platform.

Thanks so much for your help!
...

Finally making forward progress. Flashed the latest mega (1.1g) and I got the expected responses from the terminal:

$I
[VER:1.1g.20180813.Mega:]
[OPT:VNM+,35,255]
OK

Also see pulses now on...

Tried a few things ...

- swapped the Mega 2560 with a Mega 2560 R3 (starting from scratch)
- flashed and ran a simple test program to prove wiring is correct - steppers run fine
- flashed Grbl...

Tried the commands - it stays at Idle.

I did flash it the way you said. I only used XLoader the first time, a few months ago. Where do I get version 1.1g? I didn't find it in the link you gave me - only 1.1f.

Thanks

after reset:
Grbl 1.1f [$ for help]

after $i
(nothing)

after ?
<Idle|MPos:0.000,0.000,0.000|FS:0,0|WCO:0.000,0.000,0.000>

I don't get "ok" after the "?". I see you're using 1.1g - would...

Ok, I did manage to get the mega library loaded in the IDE. Sent to the Mega. Same situation - no pulses to X Y Z. Also, UGS does not show any moves. This is using Grbl Mega v1.1f, 20170802...

A little history first ...

I first installed the grbl (master) library via "sketch | include library | add ZIP Library". (I didn't put anything into the sketch folder). Then I compiled and...

No, I am not using a shield - just the Mega 2560, following the pin out outlined in the grbl documentation. Changing $4 to 1 makes no difference.

Thanks

I've read this thread with great interest as I am experiencing the same problem, but with different symptoms. I'm using Grbl 1.1 on a Mega 2560 along with UGS. The stepper drivers are DM524T...