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serial(7)							     serial(7)

     serial - serial communication ports


     All Silicon Graphics systems have two or more general purpose serial
     ports.  These ports can be used to connect terminals, printers, modems,
     other systems, or graphical input devices such as a tablet or dial and
     button box.  Each line can be independently set to run at any of several
     speeds.  Various character echoing and interpreting parameters can also
     be set.  See stty(1) and termio(7) for details on the various modes.

     Details of the serial ports found on optional add-on boards are given
     elsewhere.	 The Audio/Serial Option for CHALLENGE/Onyx provides six
     high-speed serial ports, see asoser(7) for more information.  The CDSIO
     VME board provides six serial ports; see cdsio(7) for more information.

     Special files for the serial ports exist in the /dev directory. These
     files are named tty<type><portno>, where type is one or more characters
     indicating the type of interface to the hardware that this file provides,
     and portno is a number identifying the physical port. The descriptions
     below indicate among other things which hardware signals are used by each
     port type. For more details on this see SOFTWARE USAGE below. Currently
     supported types include:

     d	  e.g. ttyd1. This is the most basic serial port type. It supports
	  TD/RD only.

     m	  e.g. ttym1. This port type provides modem control. It supports TD/RD
	  and DCD/DTR.

     f	  e.g. ttyf1. This port type provides modem and flow control. It
	  supports TD/RD, DCD/DTR and RTS/CTS.

     The following types are supported on O2, OCTANE, Origin2000/200, Origin
     3000/300, Onyx2, Onyx3, and Challenge/Onyx systems:

     c	  e.g. ttyc1. This port type provides a raw character device interface
	  to the hardware. It is intended for applications which wish to do
	  bulk data transfer with minimal overhead and no data interpretation.
	  Since this is not a streams device and no line discipline exists,
	  streams or line discipline related ioctl commands may fail or
	  silently have no effect. See cserialio(7) for details.  This port
	  type supports only TD/RD by default but RTS/CTS flow control may be
	  enabled via ioctl if the hardware supports it.

     midi e.g. ttymidi1. This port type provides a midi interface to the
	  serial device. See midi(3).

									Page 1

serial(7)							     serial(7)

     The following types are supported on OCTANE, Origin2000/200, Origin
     3000/300, Onyx2, Onyx3, and Challenge/Onyx systems:

     4d	  e.g. tty4d1. This port type enables RS422 (Appletalk) mode. It uses
	  TxD+/-, RxD+/-. On Challenge/Onyx, every 4th port (tty4d4, tty4d8,
	  etc.) is hardwired to RS422 and other ports are hardwired to RS232,
	  so this port type only exists for every 4th port.  Not present on

     4f	  e.g. tty4f1. This port type enables RS422 (Appletalk) mode including
	  the handshake signals. It uses TxD+/-, RxD+/-, HSKo and HSKi. On
	  Challenge/Onyx, every 4th port (tty4d4, tty4d8, etc.) is hardwired
	  to RS422 and other ports are hardwired to RS232, so this port type
	  only exists for every 4th port.  Not present on O2.

     In general, a serial port which is identified as the console port
     (typically port 1) cannot be opened in RS422 mode.	 This is because some
     programs may open /dev/console which is internally linked to the basic
     serial port ttyd<portno> interface type.

     For systems which do not natively support RS-422 (eg. O2), RS-232/RS-422
     serial adapter hardware is available from Silicon Graphics.

     The following type is supported on O2, OCTANE, Onyx2, Origin2000/200 and
     Origin3000/300 systems:

     us	  e.g. ttyus1. This port type provides a user mapped interface to the
	  hardware, allowing reading and writing of bytes without any system
	  call overhead. Use of this port requires installation of the
	  react.sw.usio subsystem of REACT/Pro. See usio(3) for details.

     The portno component of the tty filename identifies the actual hardware
     accessed by the device file. All tty files with the same port number
     access the same hardware, i.e. ttyd1, ttyc1 and ttymidi1 all access the
     same physical port. A given tty device may be opened any number of times,
     but only one interface type may be opened to the same physical port at a
     time, e.g. if ttyd1 is open, access will be denied to ttyf1 or ttyc1.  On
     Onyx2 systems with console set to d, and on Origin2000 and Origin200
     systems, the console port and its twin are guaranteed to be ports 1 and
     2, all other ports are dynamically assigned port numbers as per the whims
     of ioconfig(1). It may be necessary to obtain the absolute path of the
     port in the filesystem by resolving links until a true device is found in
     order to determine where on the machine the port is actually located.

     There are five different types of connectors found on various 4D models.
     Note that in terms of connectors and pin assignments, the Challenge S is
     identical to the Indy and both Challenge M and Power Challenge M are
     equivalent to the Indigo2.	 The DB-9 male serial port connectors on O2,
     OCTANE, Onyx2, Origin2000/200 and Origin3000/300 systems have the
     following IBM(R) PC/AT(tm)-like pin assignments:

									Page 2

serial(7)							     serial(7)

				\  1  2	 3  4  5  /
				 \   6	7  8  9	 /

			 Pin   Name   Description
			  1    DCD    Data Carrier Detect
			  2    RD     Receive Data
			  3    TD     Transmit Data
			  4    DTR    Data Terminal Ready
			  5    GND    Signal Ground
			  6    -      reserved
			  7    RTS    Request To Send
			  8    CTS    Clear To Send
			  9    -      reserved


     The ports on OCTANE, Onyx2, Origin2000/200 and Origin3000/300 systems can
     be set by software to an Appletalk-compatible RS-422-like mode, in which
     they have the following pin assignments:

			   Pin	 Name	Description
			    1	 -	reserved
			    2	 RxD-	Receive Data -
			    3	 TxD-	Transmit Data -
			    4	 TxD+	Transmit Data +
			    5	 GND	Signal Ground
			    6	 RxD+	Receive Data +
			    7	 HSKo	Output Handshake
			    8	 HSKi	Input Handshake
			    9	 -	reserved


     The DB-9 female serial port connectors, which are found on the CHALLENGE
     and Onyx systems, have the following pin assignments.

				\  5  4	 3  2  1  /
				 \   9	8  7  6	 /

			 Pin   Name   Description
			  2    TD     Transmit Data
			  3    RD     Receive Data
			  4    RTS    Request To Send
			  5    CTS    Clear To Send
			  7    SG     Signal Ground
			  8    DCD    Data Carrier Detect
			  9    DTR    Data Terminal Ready


									Page 3

serial(7)							     serial(7)

     The CHALLENGE and Onyx systems provide an RS-422 port.  This RS-422 port
     uses a DB-9 female serial connector and has the following pin

			 Pin   Name   Description
			  1    DTR    Data Terminal Ready
			  2    TxD-   Transmit Data -
			  3    RxD-   Receive Data -
			  4    DCD    Data Carrier Detect
			  5    CTS    Clear To Send
			  6    SG     Signal Ground
			  7    TxD+   Transmit Data +
			  8    RxD+   Receive Data +
			  9    RTS    Request to send


     In order to support peripherals that draw power from the host system, the
     CHALLENGE and Onyx systems provide two powered-peripheral serial ports.
     These ports have a DIN-8 connector.  The powered ports share the tty2 and
     tty3 signal lines with the standard DB-9 connectors; if the DB-9
     connector for tty2 is already in use, you cannot use the powered
     peripheral connector for tty2.  Similarly, if tty3's DB-9 connector is
     connected to a peripheral, the powered peripheral port connected to the
     tty3 signal lines cannot also be used.  The powered peripheral ports have
     the following pin assignments.

				     /	 2   \
				    /4	     5\
				   /	       \
				  ( 1	 8    3 )
				   \	       /
				    \ 6	    7 /

			Pin   Name     Description
			 1    DTR      Data Terminal Ready
			 2    CTS      Clear To Send
			 3    STEREO   Stereo field sync
			 4    RD       Receive Data
			 5    TD       Transmit Data
			 6    SG       Signal Ground
			 7    GND      Ground point
			 8    V10P     10V supply


     The DIN-8 serial port connectors on the Indigo, Indy, Indigo2, Challenge
     S, Challenge M, Power Challenge M, and the MENET 4-Enet, 6-serial board
     (XT-FE-4TX-6A) have the following pin assignments.

									Page 4

serial(7)							     serial(7)

				    / 8	 7  6 \
				   (  5	 4  3  )
				    \  2   1  /

		      4D Compatible Pin Assignments (RS-232)
		      Pin     Name	Description
		       1      DTR	Data Terminal Ready
		       2      CTS	Clear To Send
		       3      TD	Transmit Data
		       4      SG	Signal Ground
		       5      RD	Receive Data
		       6      RTS	Request To Send
		       7      DCD	Data Carrier Detect
		       8      SG	Signal Ground


		 Macintosh SE Compatible Pin Assignments (RS-422)
		 Pin	Name	Description
		  1	HSKo	Output Handshake
		  2	HSKi	Input Handshake Or External Clock
		  3	TxD-	Transmit Data -
		  4	GND	Signal Ground
		  5	RxD-	Receive Data -
		  6	TxD+	Transmit Data +
		  7	GPi	General Purpose Input
		  8	RxD+	Receive Data +


     The set of signals that are actually used depends upon which form of the
     device was opened.	 If the ttyd name was used, only TD, RD, and SG
     signals are meaningful.  These three signals are typically used with
     "dumb" devices that either do not need any sort of data flow control or
     use software flow control (see the description of the ixon, ixany, and
     ixoff options in stty(1) for more information on setting up software flow
     control).	If the ttym device is used, the DCD, and DTR signals are also
     used.  These signals provide a two way handshake for establishing and
     breaking a communication link with another device and are normally used
     when connecting via a modem.  When the port is initially opened, the host
     asserts the DTR line and waits for the DCD line to become active.	If the
     port is opened with the O_NDELAY flag, the open succeeds even if the DCD
     line is not active.  A hangup condition occurs if the DCD line
     transitions from active to inactive.  See open(2), and termio(7) for more
     information.  If the ttyf device is used, all of the signals are used.
     The additional signals provide for full hardware flow control between the
     host and the remote device.  The RTS line is asserted by the host
     whenever it is capable of receiving more data.  The CTS line is sampled
     before data is transmitted and if it is not active, the host suspends
     output until it is.

									Page 5

serial(7)							     serial(7)

     The DIN-8 serial port connectors on the Indy, Challenge S, Indigo2,
     Challenge M, Power Challenge M, and MENET 4-Enet, 6-serial board (XT-FE-
     4TX-6A) can be used to communicate with serial devices using RS-422
     protocol.	User can use the stream ioctl commands, SIOC_EXTCLK and
     SIOC_RS422, defined in /usr/include/sys/z8530.h to switch between
     internal/external clock and RS-232/RS-422 protocols.  Another command
     that can be useful is SIOC_ITIMER; it informs the driver how long it
     should buffer up input data, in clock ticks, before sending them
     upstream.	Data can sometimes be sent upstream before, but never after,
     this time limit.  This feature reduces the cpu cost of receiving large
     amounts of data by sending data upstream in large chunks.	This duration
     can also be configured into the kernel by tuning the duart_rsrv_duration
     variable.	On Origin, Onyx2, O2 and Octane systems, the serial hardware
     sets an input timer based on the value passed in through SIOC_ITIMER. For
     soft flow control, this input timer may result in excessively slow
     response to an XOFF request since an XOFF char is not detected by the
     software until the hardware timer expires. If soft flow control skid is
     unacceptably large, it may be necessary to reduce the latency of the
     hardware input timer by reducing the value passed to SIOC_ITIMER.

     The serial ports of all SGI systems support several standard rates up
     through 38400 bps (see termio(7) for these standard rates). The serial
     ports on O2, OCTANE, Origin2000/200, Onyx2, Origin3000/300, and Onyx3
     systems also support bit rates up through 115200 bps, including the
     following rates:

				  31250	  57600
				  76800	  115200

     Many other rates, up to 460800, can be set.  The accuracy of actual baud
     rate set is guaranteed to be within 2.5% of the desired rate.  If this
     condition cannot be met, the command (ioctl or stty) will fail.  However,
     performance at baud rates above 115200 is not guaranteed, and their use
     is not officially supported.

     At baud rates above 38400, cable length and quality become quite
     important.	 These rates are more likely to work in RS-422 mode, on
     systems that support it.

     By default, Onyx and CHALLENGE L/XL systems enable only the serial ports
     of the master IO4.	 To enable the serial ports on other IO4 boards, a
     vector line must be added for the epcserial device to
     /var/sysgen/system/  The following vector line configures the
     serial ports on the IO4 in slot 13 as tty45, tty46, and tty47:

	  VECTOR: bustype=EPC module=epcserial unit=1 slot=13

     The first two options (bustype and module) are mandatory and tell
     lboot(1M) that you're configuring serial ports.  The unit option
     specifies which set of tty names should be used for this set of ports:

									Page 6

serial(7)							     serial(7)

     unit 1 corresponds to the logical devices tty45, tty46, and tty47; unit 2
     represents devices tty49, tty50, and tty51; unit 3 specifies devices
     tty53, tty54, and tty55.  Finally, the slot option indicates which IO4
     board contains the ports that should be mapped.  Each board must have its
     own vector line.  Configuring one IO4 board's serial ports has no effect
     on any of the other boards.  After has been updated, the
     autoconfig(1M) command should be issued to reconfigure the kernel.	 It
     may also be necessary to execute MAKEDEV(1M) in order to build device
     files for the new ports.

     If the system is unable to honor the VECTOR line for some reason (if, for
     example, the specified slot is invalid), a warning message is written to
     /var/adm/SYSLOG.  These warning messages contain the string epcserial, in
     order to facilitate finding them with commands like grep(1).  Because the
     console port has not been initialized when these messages are issued, the
     kernel is unable to display the warning on the console.

     Only the master IO4 provides an RS-422 port (tty4).  Additional IO4
     boards support three RS-232 serial ports only.  To allow for future
     expansion, however, space was left in the serial port namespace for the
     additional RS-422 ports.  For this reason, there is no actual device
     associated with tty48, tty52, and tty56.


     system(4), asoser(7), cdsio(7), keyboard(7), streamio(7), termio(7),
     termios(3), cserialio(7), usio(3).

									Page 7


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