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CDSIO(7)							      CDSIO(7)

NAME    [Toc]    [Back]

     cdsio - 6-port serial I/O

SYNOPSIS    [Toc]    [Back]


DESCRIPTION    [Toc]    [Back]

     6-port boards can be used for modems or other asynchronous, serial	I/O
     devices.  The ports provided by the cdsio board are very similar to the
     on-board duart ports.

     Various character echoing and interpreting	parameters can be set
     independently for each port.  See termio(7) for details.

     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.  If
     ttyf* is desired, the "new" cabling scheme	must be	used.  The driver is
     informed of which cabling is present by its lboot(1M) file,

     When the ttyf* device name	is used, the board requires that the DSR
     signal be "true" before receiving any data.

     With the "new firmware," the board	can process significantly more than
     30,000 bytes of input and output per second.  This	is enough to support
     as	many as	4 ports	with data being	simultaneously transmitted and
     received at 38,400	bits/second.  The "old firmware" is significantly
     slower, and 38,400	is not recommended.

     To	allow the system and the board to handle high volume, high speed
     input, individual characters are accumulated for short periods before
     they are given to the rest	of the system.	While this does	make higher
     throughput	possible, it also increases the	latency	for individual
     characters.  This latency can be adjusted in the lboot(1M)	file.

     Detection of the serial I/O board is automatic.  If the board is present,
     its driver	is included in the configured kernel.  This probing and
     configuring is done when the system starts	by the rc2 scripts.

FILES    [Toc]    [Back]


									Page 1

CDSIO(7)							      CDSIO(7)

SEE ALSO    [Toc]    [Back]

     duart(7), lboot(1M), rc2(1M), system(4), termio(7)

									PPPPaaaaggggeeee 2222
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