Axel AX3000 Platine Terminal Ethernet TCP/IP 65E Guia do Utilizador descarregar pdf (Página 8)

Introduction

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2 TCP/IP AXEL Platine Terminal

This chapter introduces the concept and the main features of the AXEL TCP/IP

Platine terminal.

1.1 - OVERVIEW

Under UNIX, the connection between a host and a terminal uses a device file

called tty (or ptty for pseudo-terminals). Through this device, an application

running on the host can exchange data with a terminal. The application is thus

isolated from the actual physical link over which data transmission takes place.

The tty or ptty device is thus a logical link between the host and the

terminal:

1.1.1 - Serial Connection

The following figure illustrates a conventional terminal with a serial connection

(technically described as “asynchronous”) to the host computer:

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Axel AX3000 Platine Terminal Ethernet TCP/IP 65E Guia do Utilizador Página 8