Axel AX4000 User's Manual - Manual (Page 74)

Appendix
68
AXEL Office Server
A.3 – UNIX/LINUX AXEL TTY SERVER
A.3.1 - Introduction
The AXEL tty server is a Unix/Linux daemon (axttyd). The axttyd daemon must
be used with the Office Server tty client or tty server network services.
The AXEL tty server associates a device on the Unix/Linux host with an Office
Server resource:
- the device is a pseudo-terminal (see below),
- the Office Server resource is a serial port (ex.: ch1, ch2, etc).
This enables data written to the UNIX host device to be sent to the Office
Server port, and data received via the Office Server port to be read through the
UNIX host device.
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).