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 argu - ments 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/cuad? dialout devices
SEE ALSO
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
- BSD May 15, 1994