RXD>Grbl 1.1h ['$' for help]
TXD>asdf
RXD>error:2
RXD>ok
TXD>asdf
RXD>error:2
RXD>ok
TXD>asdf
RXD>error:2
RXD>ok
TXD>asdf
RXD>error:2
RXD>ok
TXD>asdf
RXD>error:2
RXD>ok
