Copyright (c) 1990, 1991, 1993
The Regents of the University of California. All rights reserved.
This code is derived from software contributed to Berkeley by
the Systems Programming Group of the University of Utah Computer
Science Department.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the University nor the names of its contributors
may be used to endorse or promote products derived from this software
without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
from: @(#)dcl.4 8.1 (Berkeley) 6/9/93
.Dd November 15, 2003 .Dt DCL 4 hp300 .Os .Sh NAME .Nm dcl .Nd .Tn HP 98628A serial communications link .Sh SYNOPSIS .Cd "dcl0 at dio? scode ? flags 0x1" .Sh DESCRIPTION The 98628A is a buffered .Tn EIA .Tn RS-232C
f ( Tn CCITT .Tn V.28 ) communications interface. It has one port with full modem control.
p Input and output for each line may set to one of following baud rates; 0, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800, 9600, 19200.
p An optional argument .Ar flags may be set to 1 if the line should be treated as hard-wired with carrier always present, or to 0 if modem control is desired.
p Use .Tn HP cable "98626 & 98628 opts.002, .Tn RS232-C .Tn DCE CABLE , 5061-4216" to attach non-modem devices. Use .Tn HP cable "98626 & 98628 opts.001, .Tn RS232-C .Tn DTE CABLE , 5061-4215" to attach modems.
p The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts happen on a per character basis.
p The high water and low water marks in the kernel tty routines are completely inappropriate for a device like this with a large input buffer. Don't use tandem mode if possible. A fast system can handle input at 19.2K baud without receive overflow.
p For output to devices that make heavy use of .Tn XON/XOFF a write size of less than 256 will improve performance marginally. .Sh FILES l -tag -width /dev/ttyl[0-9] -compact t Pa /dev/ttyl[0-9] .El .Sh DIAGNOSTICS l -diag t dcl%d: error 0x%x RESET CARD. Where the errors are encoded: d -unfilled -offset indent 0x06 card failure 0x0d uart receive overflow 0x0e receive overflow 0x0f missing external clock 0x10 cts false too long 0x11 lost carrier 0x12 activity timeout 0x13 connection not established 0x19 illegal databits/parity 0x1a register address out of range 0x1b register value out of range 0x-- unknown error .Ed .El .Sh SEE ALSO .Xr tty 4 .Sh BUGS The .Nm device is not actually supported in .Nx . This man page is only for information purposes in case someone wishes to port the driver from 4.3BSD.
p Breaks received at a faster rate than 1 break every second will be recognized as a single break.
p Console use is not supported.
p The .Tn RS-422/423/499 , .Tn MTS-DSN/DL modes of the card are not supported.
Indexes created Wed Sep 24 02:09:48 GMT 2025