1.\" $NetBSD: dcl.4,v 1.9 2002/02/13 08:17:55 ross Exp $ 2.\" 3.\" Copyright (c) 1990, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the Systems Programming Group of the University of Utah Computer 8.\" Science Department. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. All advertising materials mentioning features or use of this software 19.\" must display the following acknowledgement: 20.\" This product includes software developed by the University of 21.\" California, Berkeley and its contributors. 22.\" 4. Neither the name of the University nor the names of its contributors 23.\" may be used to endorse or promote products derived from this software 24.\" without specific prior written permission. 25.\" 26.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36.\" SUCH DAMAGE. 37.\" 38.\" from: @(#)dcl.4 8.1 (Berkeley) 6/9/93 39.\" 40.Dd June 9, 1993 41.Dt DCL 4 hp300 42.Os 43.Sh NAME 44.Nm dcl 45.Nd 46.Tn HP 4798628A serial communications link 48.Sh SYNOPSIS 49.Cd "dcl0 at dio? scode ? flags 0x1" 50.Sh DESCRIPTION 51The 98628A is a buffered 52.Tn EIA 53.Tn RS-232C 54.Pf ( Tn CCITT 55.Tn V.28 ) 56communications interface. 57It has one port with full modem control. 58.Pp 59Input and output for each line may set to one of following baud rates; 600, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 619600, 19200. 62.Pp 63An optional argument 64.Ar flags 65may be set to 1 if the line should be treated as hard-wired with 66carrier always present, or to 0 if modem control is desired. 67.Pp 68Use 69.Tn HP 70cable "98626 \*[Am] 98628 opts.002, 71.Tn RS232-C 72.Tn DCE CABLE , 735061-4216" to attach non-modem devices. 74Use 75.Tn HP 76cable "98626 \*[Am] 98628 opts.001, 77.Tn RS232-C 78.Tn DTE CABLE , 795061-4215" to attach modems. 80.Pp 81The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts 82happen on a per character basis. 83.Pp 84The high water and low water marks in the kernel tty routines are completely 85inappropriate for a device like this with a large input buffer. Don't use 86tandem mode if possible. A fast system can handle input at 19.2K baud without 87receive overflow. 88.Pp 89For output to devices that make heavy use of 90.Tn XON/XOFF 91a write size of less 92than 256 will improve performance marginally. 93.Sh FILES 94.Bl -tag -width /dev/ttyl[0-9] -compact 95.It Pa /dev/ttyl[0-9] 96.El 97.Sh DIAGNOSTICS 98.Bl -diag 99.It dcl%d: error 0x%x RESET CARD. 100Where the errors are encoded: 101.Bd -unfilled -offset indent 1020x06 card failure 1030x0d uart receive overflow 1040x0e receive overflow 1050x0f missing external clock 1060x10 cts false too long 1070x11 lost carrier 1080x12 activity timeout 1090x13 connection not established 1100x19 illegal databits/parity 1110x1a register address out of range 1120x1b register value out of range 1130x-- unknown error 114.Ed 115.El 116.Sh SEE ALSO 117.Xr tty 4 118.Sh BUGS 119Breaks received at a faster rate than 1 break every second will be 120recognized as a single break. 121.Pp 122Console use is not supported. 123.Pp 124The 125.Tn RS-422/423/499 , 126.Tn MTS-DSN/DL 127modes of the card are not supported. 128