User`s guide

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: