comcontrol man page on FreeBSD

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

     comcontrol — control a special tty device

     comcontrol special_device [dtrwait number] [drainwait number]

     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.

     /dev/ttyd?	 dialin devices, hardwired terminals
     /dev/cuad?	 dialout devices

     stty(1), sio(4)

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

     Christopher G. Demetriou

BSD				 May 15, 1994				   BSD

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