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#### 16.2.1 serial

Command: serial [`--unit=unit`] [`--port=port`] [`--speed=speed`] [`--word=word`] [`--parity=parity`] [`--stop=stop`] ¶

  Initialize a serial device. unit is a number in the range 0-3 specifying which serial port to use; default is 0, which corresponds to the port often called COM1. port is the I/O port where the UART is to be found; if specified it takes precedence over unit. speed is the transmission speed; default is 9600. word and stop are the number of data bits and stop bits. Data bits must be in the range 5-8 and stop bits must be 1 or 2. Default is 8 data bits and one stop bit. parity is one of ‘`no`’, ‘`odd`’, ‘`even`’ and defaults to ‘`no`’.

  The serial port is not used as a communication channel unless the `terminal_input` or `terminal_output` command is used (see terminal_input, see terminal_output).

  See also Using GRUB via a serial line.