Dtc Device File Access Utilities And Telnet Port Identification - HP 9000 Series 700 Manual

8 Configuring a DTC to enable a printer

DTC Device File Access utilities and Telnet port identification

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7 Select the Change Port Type menu item. Another pop-up window appears.
8 Type an x or X in the printer field (use the arrow key to access this field). The
terminal field automatically clears. Press Return or the Done (F4) key.
An asterisk (*) appears at the changed port on the Rear Panel Configuration
screen. If you changed port 3 for example, you would see 3*P at that port.
9 Exit from dtcconfig and return to the HP-UX shell prompt.
DDFA provides an interface to remote DTC ports which is similar to the interface
for local MUX ports. DDFA consists of a group of configuration files, executable
files, and a daemon. The DTC Device File Access (DDFA) utilities software is part
of Internet Services and is automatically installed with it on HP 9000 Series 700,
and 800 systems for HP-UX 9.x or later.
DDFA is intended for those who wish to use pty device file names to access serial
devices attached to DTCs and other terminal servers. Without DDFA, pty device file
names are assigned randomly to devices on DTCs. This randomness makes it
difficult to associate a specific pty device file with a specific device connected to a
DTC.
DDFA allows the system or network administrator to configure a correspondence
between a DTC port (or another terminal server port) and a given pty device file
name. Devices on the DTC (or terminal server) can then be referred to by their pty
device file names. For example, these pty device file names can be used with
standard read(), write(), open(), close(), and ioctl() calls.