Configuration:SerialPort

[serial]

#====NEW/Changed in 0.65
# serial1-4 -- set type of device connected to com port.
#              Can be disabled, dummy, modem, directserial.
#              Additional parameters must be in the same line in the form of
#              parameter:value. Parameters for all types are irq, startbps, bytesize,
#              stopbits, parity (all optional).
#              for directserial: realport (required).
#              for modem: listenport (optional).
#              Example1: serial1=modem listenport:5000
#              Example2: serial1=directserial realport:COM3

serial1=dummy
serial2=dummy
serial3=disabled
serial4=disabled

An example of how to configure an actual serial port for I/O use:

serial1=directserial realport:com1