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Freeing up a serial port with a modem connected

 
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Old 01-16-2008
Question Freeing up a serial port with a modem connected
I currently access a remote Unix server which has an external modem connected to one of it's serial ports (/dev/cua/b). At times, this server undergoes a hard reset and for some reason this disallows us from making use of the modem any longer. A hard reset of the modem always seems to fix the problem, however I was wondering if there was anything I could do from my x-terminal to "kick or free-up" the port/modem. When I issue the tip /dev/cua/b command when things are working, I am able to query the modem using ATI4 and such. But when either it or the port are in this strange state, I get no echo back of characters that I type while in tip. Can anyone recommand a command that I can issue from the Unix prompt to free up the port to avoid having me to call in a help ticket to simply get the modem reset?
 
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LEARN ABOUT DEBIAN

sredird

sredird(8)							      sredird								sredird(8)

NAME

       sredird - RFC 2217 serial port server

SYNOPSIS

       sredird [-i] log-level serial-device lock-file [poll-interval]

DESCRIPTION

       This manual page documents briefly the sredird, program.

       This  program  when  run  through inetd will use the RFC 2217 extensions to TELNET to implement serial commands over the TCP connection and
       interface to a specified serial port.

OPTIONS

       An optional first parameter is '-i' to enable compatability with Cisco IOS.

       The first mandatory parameter is the log level for use in syslog.  The next mandatory parameter is the device node for the  serial  device,
       it  must  be  a	fully  qualified  path.   The  final mandatory parameter is the file name for the lock file to be used to prevent multiple
       instances of sredird from talking to the serial port at the same time, or to allow sharing a port between modem and sredird.

EXAMPLE

       Here is a configuration line for running it from inetd: sredir	       stream  tcp     nowait  root    /usr/sbin/tcpd /usr/sbin/sredird  5
       /dev/modem /var/lock/LCK..modem

AUTHOR

       This  man page was written by Russell Coker <russell@coker.com.au>.  May be freely used and distributed without restriction under the terms
       of the GPL.

       The sredird program was written by Denis Sbragion <d.sbragion@infotecna.it> and Jeffrey Altman <jaltman@columbia.edu>.

Russell Coker <;russell@coker.com.au>				       2.2.0								sredird(8)