Each frame starts with one start bit ( a'0') followed by eight data bits ( least significant bit first ) followed by two stop bits ('1's ).
42.
The master then either ends transmission with a stop bit, or it may send another START bit if it wishes to retain control of the bus for another transfer ( a " combined message " ).
43.
The Model 33 used the seven-bit upper-case only ASCII code, also known as CCITT International Telegraphic Alphabet No . 5, with one ( even ) parity bit and two stop bits.
44.
The F-Bus is a bi-directional full-duplex serial type bus running at 115, 200 bit / s, 8 data bits, no parity, one stop bit ( 8N1 ).
45.
If the sender has nothing more to send, the line simply remains in the marking state ( as if a continuing series of stop bits ) until a later space denotes the start of the next character.
46.
In order to avoid this problem, additional " framing " bits are added to either end of every byte, typically one bit on either side known as the " start and stop bits ".
47.
If parity is specified and we use 2 stop bits, the overhead for carrying one 8 bit character is 4 bits ( one start bit, one parity bit and two stop bits )-or 50 %!
48.
If parity is specified and we use 2 stop bits, the overhead for carrying one 8 bit character is 4 bits ( one start bit, one parity bit and two stop bits )-or 50 %!
49.
"' Synchronous transmission "'uses no start and stop bits, but instead synchronizes transmission speeds at both the receiving and sending end of the transmission using clock signal ( s ) built into each component.
50.
Typical serial ports used with personal computers connected to modems use eight data bits, no parity, and one stop bit; for this configuration the number of ASCII characters per second equals the bit rate divided by 10.
