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Selects serial port transmission speed. The speed must be matched on the other side.
Long or noisy lines may require lower speeds.
Flow Control
Flow control can prevent data loss from buffer overflow. When sending data, if the
receiving buffers are full, a 'stop' signal can be sent to stop the data flow. Once the
buffers are empty, a 'start' signal can be sent to re-start the flow. Hardware flow
control uses two wires to send start/stop signals.
Data Bits
Data Bits
Parity
A parity bit can be sent with the data bits to detect some transmission errors. Even:
parity bit is 0 if the num of 1's in the data bits is even. Odd: parity bit is 0 if num of 1's
in the data bits is odd. Mark: parity bit is always 1. Space: Parity bit is always 0. Mark
and Space Parity do not allow for error detection.
Stop Bits
Stop bits indicate the end of a serial data packet. ( A start bit indicates the beginning).
The standard setting is 1 stop bit. Communication with slow devices may require
more than 1 stop bit.
Chapter 3 – AMI BIOS Setup
115200
None
Hardware RTS/CTS
Software Xon/Xoff
7
8
None
Even
Odd
Mark
Space
1
2
38
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