128 lines
4.1 KiB
Groff
128 lines
4.1 KiB
Groff
.\" $NetBSD: dcl.4,v 1.4 1997/10/19 12:56:28 mrg Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the Systems Programming Group of the University of Utah Computer
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.\" Science Department.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" from: @(#)dcl.4 8.1 (Berkeley) 6/9/93
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.\"
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.Dd June 9, 1993
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.Dt DCL 4 hp300
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.Os
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.Sh NAME
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.Nm dcl
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.Nd
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.Tn HP
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98628A communications link
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.Sh SYNOPSIS
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.Cd "device dcl0 at scode? flags 0x1"
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.Sh DESCRIPTION
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The 98628A is a buffered
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.Tn EIA
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.Tn RS-232C
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.Pf ( Tn CCITT
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.Tn V.28 )
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communications interface.
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It has one port with full modem control.
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.Pp
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Input and output for each line may set to one of following baud rates;
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0, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
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9600, 19200.
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.Pp
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An optional argument
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.Ar flags
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may be set to 1 if the line should be treated as hard-wired with
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carrier always present, or to 0 if modem control is desired.
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.Pp
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Use
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.Tn HP
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cable "98626 & 98628 opts.002,
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.Tn RS232-C
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.Tn DCE CABLE ,
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5061-4216" to attach non-modem devices.
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Use
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.Tn HP
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cable "98626 & 98628 opts.001,
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.Tn RS232-C
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.Tn DTE CABLE ,
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5061-4215" to attach modems.
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.Pp
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The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts
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happen on a per character basis.
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.Pp
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The high water and low water marks in the kernel tty routines are completely
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inappropriate for a device like this with a large input buffer. Don't use
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tandem mode if possible. A fast system can handle input at 19.2K baud without
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receive overflow.
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.Pp
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For output to devices that make heavy use of
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.Tn XON/XOFF
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a write size of less
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then 256 will improve performance marginally.
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.Sh FILES
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.Bl -tag -width /dev/ttyl[0-9] -compact
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.It Pa /dev/ttyl[0-9]
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.El
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.Sh DIAGNOSTICS
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.Bl -diag
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.It dcl%d: error 0x%x RESET CARD.
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Where the errors are encoded:
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.Bd -unfilled -offset indent
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0x06 card failure
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0x0d uart receive overflow
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0x0e receive overflow
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0x0f missing external clock
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0x10 cts false too long
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0x11 lost carrier
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0x12 activity timeout
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0x13 connection not established
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0x19 illegal databits/parity
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0x1a register address out of range
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0x1b register value out of range
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0x-- unknown error
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.Ed
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.El
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.Sh SEE ALSO
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.Xr tty 4
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.Sh BUGS
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Breaks received at a faster rate then 1 break every second will be
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recognized as a single break.
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.Pp
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Console use is not supported.
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.Pp
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The
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.Tn RS-422/423/499 ,
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.Tn MTS-DSN/DL
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modes of the card are not supported.
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