Terminal output: parity, 7 vs. 8 bits, etc.

[Dave Martindale]

Two stop bits are usually used with 110 baud because 110 baud's main
purpose in life is driving all-mechanical Teletype model 33's.
These apparently REQUIRE the extra stop bit to provide enough delay
for their mechanical innards to be ready for the start of the next
character.

For electronic receiving devices, 2 stop bits are never necessary
if both receiver and transmitter are operating properly.  You might
conceivably want to use it in the unlikely event that the transmit
or receive clock was sufficiently off-frequency that the transmitter
and receiver eventually got out of sync with only 1 stop bit between
characters.