Optional Arguments - Black Box 37687 User Manual

Optional arguments

The other optional arguments modify the behaviour of the daemon in the way it controls
connections, and processes data to and from the peripheral. They are defined as follows:
Terminal Server User Guide
Black Box IOLAND Utility
Argument Description
-T Enable Telnet protocol processing. This is useful to ensure that the last data
block of a print job has reached the Terminal Server before closing the TCP
connection. If the end of print jobs are still being lost despite using this option
then it is advised to set the stty option 'noflsh' on the slave pseudo-tty if it is
supported. This may require the -m or -a options. Alternatively, most line
printer spoolers employ a delay before closing the printer port to ensure no
pending output is accidentally flushed. It may be possible to increase this
delay if the above solutions are not enough. Make sure the port is set to
telnet mode in the Port Setup Menu.
-p The daemon maintains a continuous TCP connection to the Terminal
Server port. This is useful for applications that require exclusive and
uninterrupted access to a device. Note that no other daemon will be able to
access such a port if any daemon is running to that port with this option.
-h Hangs up the pseudo-tty if the TCP connection is lost. This mimics the
situation in which a real serial port loses a signal such as DCD. In the same
manner as the serial port, a SIGHUP signal will be sent to all processes that
have the slave pseudo-tty as their controlling tty. See the -w option.
-n Converts all carriage-returns read from the client process to carriage-return
and line-feed. This is useful if using ioland for printing and the print job is off
the right margin (for example, 'stair stepping').
-m Push the STREAMS tty modules onto the slave pseudo-tty. This is useful
for applications that expect to modify tty parameters as if a hardware device
was attached.The modules pushed are the line discipline (normally called
ldterm) and the hardware emulation (if supported). This option requires that
the pseudo-tty architecture is based on the STREAMS I/O mechanism.The
recommended Unix variants for using this option are those based on
System V Release 3. Variants based on System V Release 4 should first try
the -a option.
-a Use the autopush facility to push STREAMS modules onto the slave
pseudo-tty. This facility is supported on Unix System V Release 4 variants.
-u Discard all data received from the peripheral. This is useful in cases where
the peripheral is sending unwanted data to the host, which is not being read
by the client and therefore may cause blockage problems on the pseudo-tty.
-w Used with the -h and -p options. By default, on a hang-up, the daemon will
open a new pseudo-tty before it has reconnected to the Terminal Server
port. This option does the opposite and tries to re-establish the TCP
connection first.
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Chapter 9 Other devices setup