CNET CWC-854 Manual do Utilizador descarregar pdf (Página 28)

ThinkCore IA241/240 Linux User’s Manual Getting Started

2-19

The testing environment is illustrated in the following figure. However, note that there are

limitations to the example program tcps2.c.

tcps2.c

RS-232 LAN

PC 2PC 1

Write data to PC1

Receive LAN data

Read serial data

Send data to PC2

Serial Rx

Buffer

LAN Rx

Buffer

NOTE The tcps2.c application is a simple example designed to give users a basic understanding of the

concepts involved in combining Ethernet communication and serial port communication.

However, the example program has some limitations that make it unsuitable for real-life

applications.

1. The serial port is in canonical mode and block mode, making it impossible to send data from

the Ethernet side to the serial side (i.e., from PC 2 to PC 1 in the above example).

The Ethernet side will not accept multiple connections.

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CNET CWC-854 Manual do Utilizador Página 28