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DUART(7)							      DUART(7)

NAME    [Toc]    [Back]

     duart - on-board serial ports

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

     Each IRIS-4D system uses a	DUART to connect the mouse and the keyboard.
     Most models are also equipped with	some number of additional `on-board'
     serial ports.  The	Indigo,	Indy, Indigo2, O2 and OCTANE have two ports;
     and the Onyx and the Challenge can	be configured with as few as four
     serial ports and as many as 16.  The first	of these ports,	/dev/ttyd1, is
     often used	for the	`serial' or `debugging'	console.  Other	ports are
     commonly used for serial terminal connections, modems, a dial-and-button
     box, or a bit-pad.

     The Indigo, Indy and Indigo2 have only DIN-8 connectors.  Onyx and
     Challenge systems with a single IO4 board have 3 RS232 DB-9 ports,	2
     DIN-8 powered peripheral ports, and 1 RS422 DB-9 port.  Each additional
     IO4 board provides	three more RS232 DB-9 ports. All other systems have
     DB-9 connectors for all ports.  See serial(7) for the pinout on the

     Special files for the serial ports	exist in the /dev directory.  These
     files, tty[dfm][1-4] are created by MAKEDEV(1M).  The Challenge and the
     Onyx systems differ from previous systems in that all of their DUARTS
     reside on the IO4 boards rather than on the processor boards.  The	ports
     on	the master IO4 board are numbered tty[dfm][1-4].  TTY 4	is an RS422
     port, and it provides differential	signal lines as	part of	this protocol.
     If	multiple IO4 boards are	installed on an	Onyx or	Challenge system,
     these ports will tty[dfm]45-56.  The second IO4 provides ports 45-47, the
     third IO4 provides	ports 48-50, etc.

     Each line may be independently set	to run at any of several speeds, as
     high as 19,200 or even 38,400 bps.	 Various character echoing and
     interpreting parameters can also be set.  See stty(1) and termio(7) for

     By	opening	either the ttyd*, ttym*, or ttyf* device name of a port,
     different hardware	signals	are supported.	Ttyd* is typically used	for
     direct connect devices such as terminals; ttym* is	used for devices that
     use modem control such as modems; and ttyf* is used for devices that
     understand	hardware flow control such printers and	high speed modems.
     See serial(7) for detailed	information on supported signals.

     The driver	for this device	must be	configured in the kernel by specifying
     it	with `INCLUDE' in the /var/sysgen/system file.

FILES    [Toc]    [Back]


									Page 1

DUART(7)							      DUART(7)

SEE ALSO    [Toc]    [Back]

     stty(1), serial(7), termio(7), keyboard(7), cdsio(7), system(4)

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