1.\" Copyright (c) 1990, 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the Systems Programming Group of the University of Utah Computer 6.\" Science Department. 7.\" 8.\" %sccs.include.redist.man% 9.\" 10.\" @(#)dcl.4 8.1 (Berkeley) 06/09/93 11.\" 12.Dd 13.Dt DCL 4 hp300 14.Os 15.Sh NAME 16.Nm dcl 17.Nd 18.Tn HP 1998628A communications link 20.Sh SYNOPSIS 21.Cd "device dcl0 at scode? flags 0x1" 22.Sh DESCRIPTION 23The 98628A is a buffered 24.Tn EIA 25.Tn RS-232C 26.Pf ( Tn CCITT 27.Tn V.28 ) 28communications interface. 29It has one port with full modem control. 30.Pp 31Input and output for each line may set to one of following baud rates; 320, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 339600, 19200. 34.Pp 35An optional argument 36.Ar flags 37may be set to 1 if the line should be treated as hard-wired with 38carrier always present, or to 0 if modem control is desired. 39.Pp 40Use 41.Tn HP 42cable "98626 & 98628 opts.002, 43.Tn RS232-C 44.Tn DCE CABLE , 455061-4216" to attach non-modem devices. 46Use 47.Tn HP 48cable "98626 & 98628 opts.001, 49.Tn RS232-C 50.Tn DTE CABLE , 515061-4215" to attach modems. 52.Pp 53The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts 54happen on a per character basis. 55.Pp 56The high water and low water marks in the kernel tty routines are completely 57inappropriate for a device like this with a large input buffer. Don't use 58tandem mode if possible. A fast system can handle input at 19.2K baud without 59receive overflow. 60.Pp 61For output to devices that make heavy use of 62.Tn XON/XOFF 63a write size of less 64then 256 will improve performance marginally. 65.Sh FILES 66.Bl -tag -width /dev/ttyl[0-9] -compact 67.It Pa /dev/ttyl[0-9] 68.El 69.Sh DIAGNOSTICS 70.Bl -diag 71.It dcl%d: error 0x%x RESET CARD. 72Where the errors are encoded: 73.Bd -unfilled -offset indent 740x06 card failure 750x0d uart receive overflow 760x0e receive overflow 770x0f missing external clock 780x10 cts false too long 790x11 lost carrier 800x12 activity timeout 810x13 connection not established 820x19 illegal databits/parity 830x1a register address out of range 840x1b register value out of range 850x-- unknown error 86.Ed 87.El 88.Sh SEE ALSO 89.Xr tty 4 90.Sh BUGS 91Breaks received at a faster rate then 1 break every second will be 92recognized as a single break. 93.Pp 94Console use is not supported. 95.Pp 96The 97.Tn RS-422/423/499 , 98.Tn MTS-DSN/DL 99modes of the card are not supported. 100