all: Restores all settings to their default values.
databits: Restores the databits setting to its default value of 8.
flowcontrol: Restores the flowcontrol setting to its default value of none.
parity: Restores the parity setting to its default value of none.
speed: Restores the speed setting to its default value of 9600.
stopbits: Restores the stopbits setting to its default value of 1.
even: Enables error checking by setting the parity bit to 1 (if needed) making the number of 1s in the data bits even.
none: Disables error checking.
odd: Enables error checking by setting the parity bit to 1 (if needed) making the number of 1s in the data bits odd.