|<big>'''H'''</big> || move home<sup>**</sup> || move to origin position (0/0 mm)
|-
|<big>'''i'''</big> || identify<sup>**</sup> || returns "#ID: ''id widht width x-origin y-origin pulley_radius''" on serial line to identify the DrawBot<br>''id'' - reflects the jumper settings of pins A0/A1/A2 [0 ...7]<br>''width'' - distance of the two stepper motors
|-
|<big>'''#''' ''comment ...''</big> || comment<sup>**</sup> || rest of line, up to the next character 13 (carriage return), will be ignored<br>comment is echo'ed to the serial line