UART - Raspberry Pi Hardware Reference - page 90

where

B is the baud rate.

s is the start bit (always 1).

d is the number of data bits (5, 6, 7, or 8).

p is the parity bit (0 or 1).

S is the stop bit (1, 1.5, or 2).

The 115200 baud link allows 11,250 bytes per second. If a parity bit is added, the
throughput is reduced:

115200
1811
10 472 7

D rate =

+++

= , . bytes/sec

The addition of a parity bit reduces the transmission rate to 10,472.7 bytes per second.
Table 9-3 lists the standard baud rates that a serial link can be configured for on the
Raspberry Pi.

Table 9-3. Standard Baud Rates

Rate Notes

75 Teletypewriters

110 Teletypewriters

300 Low-speed (acoustic) modem

1200

2400

4800

9600

19200

38400

57600

115200 Raspberry Pi console