Aaeon EMB-QM87A Manual de usuario descargar pdf (Pagina 54)

EMB-QM87A

None

Even

Odd

Mark

Parity

Space

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.

1 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.

None Flow Control

Hardware RTS/CTS

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.

Chapter 3 AMI BIOS Setup 3-18

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Aaeon EMB-QM87A Manual de usuario Pagina 54