Epson 8900 Series - Manual (Page 210)

Communication Interfaces 10-19
In addition to the data bits, each character contains the following bits.
q Start bit — A bit immediately preceding the character bits that
signals the start of the asynchronous data transmission.
q Parity bit — A bit immediately following the character bits that
allows the printer to check the integrity of the received data. The
setup menu allows you to select even, odd, mark, space, or no
parity checking.
q Stop bit — A bit immediately following the parity bit that
signals the end of the asynchronous data transmission.
lsb msb
transfer direction
parity
bit
start
bit
stop
bit
1 2 3 4 5 6 7 8
▲
▲
lsb msb
transfer direction
parity
bit
start
bit
stop
bit
1 2 3 4 5 6 7 9
▲
▲
serial data structures
8