Axel AX3000 65 User's Manual Manual do Utilizador descarregar pdf (Página 100)

Installing under UNIX/LINUX

88 AX3000 - User's Manual

5.4 - THE AXEL TTY SERVER

5.4.1 - Overview

The TTY server emulates a multi i/o board connection over a TCP/IP

connection. For example using this service a remote printer attached to an Axel

terminal is accessed by Unix as a local printer via /dev/ttyp4, which may be

preferable over using LPD in certain circumstances. Similarly the Axel terminal

can be accessed via a predetermined and fixed /dev/ttyp, which in certain cases

may be preferable over using telnet.

The AXEL tty server is a UNIX daemon (axttyd). The axttyd daemon must be

used with the AX3000 tty or rtty network service.

The AXEL tty server creates a ‘pipe’ between pseudo devices on the UNIX host

(/dev/ttypx) and AX3000 resources (sessions and/or auxiliary ports). This ‘pipe’

lets Unix treat the Axel sessions and auxiliary ports as local resources.

Note about pseudo-terminals: a pseudo-terminal is composed of two parts: a

master file and a slave file. UNIX supports two possible styles for naming pttys:

- one master and x slaves

(AT&T style): the master filename is /dev/ptmx

and the slave filenames are /dev/pts/xxx (where xxx is a number).

- x masters and x slaves

(Berkeley style): the master filename is

/dev/ptypxxx and the slave filenames are /dev/ttypxxx (where xxx is the

same number for master and slave).

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Axel AX3000 65 User's Manual Manual do Utilizador Página 100