Sorry,i'm a newbee .
Thanks everyone a lot.
The problems like that :
the first uno send "?"to the second uno ,the second one has grbl
when i wiring first tx to the second rx,(gnd are com)
display correctly:
<Idle|MPos:0.000,0.000,0.000|FS:0,0|Ov:100,100,100>
ok
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
but when i also wiring first rx to second tx, it mess up:
error:2
ok
error:1
ok
error:1
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
error:2
ok
error:1
ok
error:1
ok
<Idle|MPos:0.000,0.000,0.000|FS:0,0>
ok
ok
ok
ok
error:1
ok
error:1
ok