STATSERIAL(1)

NAME
       statserial - display serial port modem status lines

SYNOPSIS
       statserial [-n |  -d | -x] <device-name>

DESCRIPTION
       Statserial  displays  a table of the signals on a standard
       9-pin or 25-pin serial port, and indicates the  status  of
       the  handshaking  lines.  It  can  be useful for debugging
       problems with serial ports or modems.

       The optional device-name parameter is the full name of the
       device file for the serial port in question. If not speci-
       fied, the default is taken from the  environment  variable
       MODEM if set, otherwise /dev/cua1.

COMMAND-LINE OPTIONS
       Each of the command line options is mutually exclusive.

       -n   Normally  statserial will loop continuously, updating
            the status at one  second  intervals;  you  can  exit
            using Control-C. The -n option disables looping.

       -d     With this option the status of the modem is printed
            as a decimal number. The bits are encoded as  follows
            (XXX indicates unused bits):

            +---+---+---+---+---+---+---+---+---+
            | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
            +---+---+---+---+---+---+---+---+---+
            |DSR|RI |DCD|CTS|XXX|XXX|RTS|DTR|XXX|
            +---+---+---+---+---+---+---+---+---+

       -x   This option is the same as -d, except that the output
            is in hexadecimal.

BUGS/LIMITATIONS
       Statserial  only  works  with  devices  that  support  the
       TIOCMGET ioctl.

       You need permission to read the device file.

       The  device  file  may be locked if other applications are
       using it.

AUTHOR
       Statserial  was  written  by  Jeff   Tranter   (Jeff_Tran-
       ter@Mitel.COM),    later   updated   by   Frank   Baumgart
       godot@uni-paderborn.de and is released under the  condi-
       tions  of  the  GNU  General Public License.  See the file
       COPYING and notes in the source code for details.

SEE ALSO
       setserial(8) stty(1) 
       /usr/src/linux/drivers/char/serial.c
       /usr/include/linux/termios.h