COMCONTROL(8)           FreeBSD System Manager's Manual          COMCONTROL(8)

NAME
     comcontrol - control a special tty device

SYNOPSIS
     comcontrol special_device [dtrwait number] [drainwait number]

DESCRIPTION
     The comcontrol utility is used to examine and modify some of the special
     characteristics of the specified tty device.  If no arguments other than
     the device (or "-" for stdin) are specified, it prints the settings of
     all controllable characteristics.  This usage requires only read access
     on the device.  Only the superuser can change the settings.

     The following options are available:

     dtrwait number
             Set the time to wait after dropping DTR to the given number.  The
             units are hundredths of a second.  The default is 300 hundredths,
             i.e., 3 seconds.  This option needed mainly to set proper recover
             time after modem reset.

     drainwait number
             Set the time to wait for output drain to the given number.  The
             units are seconds.  The default is 5 minutes, 0 means waiting
             forever.  This option needed mainly to specify upper limit of
             minutes to prevent modem hanging.

     The standard way to use comcontrol is to put invocations of it in the
     /etc/rc.d/serial startup script.

FILES
     /dev/ttyd?  dialin devices, hardwired terminals
     /dev/cuau?  dialout devices

SEE ALSO
     stty(1),

HISTORY
     Originally part of cgd's com package patches, version 0.2.1, to
     386BSD-0.1.  Once controlled bidirectional capabilities.  Little is left
     to control now that these capabilities are standard.

AUTHORS
     Christopher G. Demetriou

FreeBSD 13.1-RELEASE-p6          May 15, 1994          FreeBSD 13.1-RELEASE-p6