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 specified, the default is taken from the environment variable MODEM if
       set, otherwise /dev/ttyS0.

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_Tranter@Mitel.COM), later updated by Frank
       Baumgart (godot@uni-paderborn.de) and is released under the conditions 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