User`s guide

The AXEL Proprietary Network Servers
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TCP/IP AXEL Platine Terminal 63
network user and is managed by the UNIX spooler with the lp and associated
commands.
Every auxiliary port can be accessed through a print or a tty AXEL server. It is
possible to control 3 system printers attached to a single Platine terminal.
8.1.2 - The Three AXEL Servers: printd, ttyd and rprint
AXEL has developed three different servers:
printd: the uni-directional print server (Platine Peripheral)
This server uses a proprietary protocol to establish the connection
with the AX3000 terminal.
The printd service must be activated through the AX3000's Set-Up.
The printd server is a background process. It reads data from a
UNIX device (named pipe or pseudo-terminal).
When the Platine auxiliary port is not used by printd, this port is
available for other applications (local printing for example).
ttyd: the bi-directional tty server (Platine Peripheral)
No protocol is used to establish the connection (the ttyd server is
transparent between the UNIX System and the peripheral).
The rtty service must be activated through the AX3000's Set-Up.
The ttyd server is a background process. It reads and writes data
from/to a UNIX device (a pseudo-terminal only).
In contrast to the printd server, once the connection has been
established, the Platine auxiliary port controlled by the ttyd server is
not available for other applications until the ttyd has disconnected.
rprint: the uni-directional print server (Platine Peripheral)
No protocol is used to establish the connection (the ttyd server is
really transparent between the UNIX System and the peripheral).
The rtty service must be activated through the AX3000's Set-Up.
The printd server is not a background process but a simple
program. It reads data from standard input (stdin), not from a
UNIX device.
When the Platine auxiliary port is not used by rprint, this port is
available for other applications (local printing for example).