thx for reply.
I am connected via wifi, this is the offending command: M4
G00 G17 G40 G21 G54
ok
ok
G90
ok
G0 X2 Y2
ok
G91
ok
M4
error:20
Unsupported or invalid g-code command found in block.
EDIT:I have just seen this post:Another M4 error with DLC32 V2.1.003
It seems to be a firmware problem.
Very bad for me,as I had to compile the source code to invert the Y-axis pins with the Z-axis ones (on the board there are 2 connectors for the Y-axis,on my machine I have 2 motors in the Z-axis) so I will have to look for the bug,but I don’t know where