pmux_stty(1)						      General Commands Manual						      pmux_stty(1)

NAME

       - set the options for a port on the HP AD278A/AD279A PCI Mux card.

SYNOPSIS

       options]

DESCRIPTION

       The  command  options are used to turn on and off a number of special flags. These flags are used to control driver I/O processing on a PCI
       Multiplexer port.  These commands are enhancements to the standard commands, and affects the operation of the port.

       Many of the output modes are implemented in the AD278A/AD279A PCI Mux hardware.	This allows greater throughput with  less  CPU	processing
       overhead  than  other serial I/O devices.  There are some features which are still handled by the line discipline and the use of these fea-
       tures results in traditional CPU overheads and throughput.

       If flag is not enabled then maximum output performance is achieved.  Even if flag is enabled, the settings are handled in the hardware  and
       maximum output performance will still be maintained. Following are the settings that are handled in hardware:

       The use of other settings results in additional software overhead on output characters.

       Use  of	"raw"  mode  on input also maximizes throughput and reduces CPU processing overheads.  However, even in raw mode some and settings
       require line discipline intervention.  Applications that want maximum throughput and/or minimal CPU overhead must avoid the following  set-
       tings:

       The  line  discipline  also supports the "block mode" feature.  When a device is in "block mode", software overhead is introduced to handle
       the device protocol and the benefits of the AD278A/AD279A HP PCI Mux hardware are also mitigated.

       The commands are usually enabled at the terminal using the format:

       pmux_stty [+(-) option]

       or, they may be entered from the console, and redirected to the port in which they are to take effect. For example,

       pmux_stty [+(-) option] < /dev/tty2a1

       See below for the new naming conventions used for HP AD278A/AD279A PCI Mux ports.

DISPLAY OPTIONS

       To see the complete list of available options and syntax for the command, enter without any options.  The options are:

       Report the current settings of the pmux_stty options.

       Display the HP AD278A/AD279A PCI Mux hardware configuration, including
				the logical card number, ID, slot, and type of the cards that are installed and configured.

       Use pmux_stty dtr 1 to force the DTR control signal high, regardless of the application.

       Ignore (do not ignore) the
				option, which permits any character to act as an XON character for resuming output.

				A number of applications enable the feature in the standard profile.  This destroys the integrity of software flow
				control  because  any  user type ahead is erroneously interpreted as an XON after the terminal sends an XOFF.  The
				command is provided to correct the most common application-related problems experienced when running terminals	at
				high speed.

				NOTE:  is  transparent to users. It should always be set for terminal speeds above 9600bps when hardware flow con-
				trol is not used.

       Ignore (do not ignore) the
				option, which is used by some applications to disable XON/XOFF software flow control.  Setting this option  forces
				the driver to apply XON/XOFF flow control to the port, regardless of whether or not the application has set

       Perform physical loopback test. Invoke the loopback test with
				loopback plug connected to a port.

				e.g.,

       Display the current status of the RS-232 modem control
				signals (RTS, CTS, DSR, DCD, DTR, and RI) for a port.

       Restart stopped output exactly as if an XON character was received.

       Forces a port to honor and pass (not pass) XON/XOFF software flow
				control,  until  the  port is closed, or the option is disabled.  This is useful for applications that need to see
				XON/XOFF characters.

NAMING CONVENTION

       HP AD278A/AD279A PCI Mux ports use the following syntax for naming device files:

       where categoties are:

	    tty  = direct connect

	    ttyd = modem dial-in

	    cul  = modem dial-out

	    cua  = modem dial-out with automatic caller

       refers to a device instance number

       refers to a port module whose valid range is 'a' to 'd'

       and

       refers to a port number whose valid range is 1 to 16.

SEE ALSO

       stty(1), termio(7), modem(7).

																      pmux_stty(1)