serial-term
    
    serial-term is an interactive autoloaded compiled Lisp function in `term.el'.
(serial-term PORT SPEED)
Start a terminal-emulator for a serial port in a new buffer.
PORT is the path or name of the serial port.  For example, this
could be "/dev/ttyS0" on Unix.  On Windows, this could be
"COM1" or "\\.\COM10".
SPEED is the speed of the serial port in bits per second.  9600
is a common value.  SPEED can be nil, see
`serial-process-configure' for details.
The buffer is in Term mode; see `term-mode' for the commands to
use in that buffer.
Type C-c b to switch to another buffer.