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1.1       root        1: .\" Copyright (c) 1990 The Regents of the University of California.
                      2: .\" 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: .\" Redistribution and use in source and binary forms are permitted provided
                      9: .\" that: (1) source distributions retain this entire copyright notice and
                     10: .\" comment, and (2) distributions including binaries display the following
                     11: .\" acknowledgement:  ``This product includes software developed by the
                     12: .\" University of California, Berkeley and its contributors'' in the
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                     15: .\" Neither the name of the University nor the names of its contributors may
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                     17: .\" specific prior written permission.
                     18: .\" THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
                     19: .\" WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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                     21: .\"
                     22: .\"    @(#)dcl.4       5.1 (Berkeley) 6/29/90
                     23: .\"
                     24: .TH DCL 4 "June 29, 1990"
                     25: .UC 7
                     26: .SH NAME
                     27: dcl \- HP 98628A communications link
                     28: .SH SYNOPSIS
                     29: .B "device             dcl0    at scode? flags 0x1"
                     30: .SH DESCRIPTION
                     31: The 98628A is a buffered EIA RS-232C (CCITT V.28) communications interface.
                     32: It has one port with full modem control.
                     33: .PP
                     34: Each line attached to the 98628A behaves as described in
                     35: .IR tty (4).
                     36: Input and output for each line may set to one of following baud rates;
                     37: 0, 50, 75, 110, 134.5, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
                     38: 9600, 19200. See 
                     39: .IR tty (4)
                     40: for the encoding.
                     41: .PP
                     42: .I Flags
                     43: should be set to 1 if the line should be treated as hard-wired with
                     44: carrier always present, or to 0 if modem control is desired.
                     45: .PP
                     46: Use HP cable "98626 & 98628 opts.002, RS232-C DCE CABLE, 5061-4216" to attach non-modem devices.
                     47: Use HP cable "98626 & 98628 opts.001, RS232-C DTE CABLE, 5061-4215" to attach modems.
                     48: .PP
                     49: The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts
                     50: happen on a per character basis.
                     51: .PP
                     52: The high water and low water marks in the kernel tty routines are totally
                     53: inappropriate for a device like this with a large input buffer.  Don't use
                     54: tandem mode if possible.  A fast system can handle input at 19.2K baud without
                     55: receive overflow.
                     56: 
                     57: For output to devices that make heavy use of XON/XOFF a write size of less
                     58: then 256 will improve performance marginally.
                     59: .SH FILES
                     60: /dev/ttyl[0-9]
                     61: .SH "SEE ALSO"
                     62: tty(4)
                     63: .SH DIAGNOSTICS
                     64: \fBdcl%d: error 0x%x RESET CARD\fR Where the errors are in coded as
                     65: .DS
                     66: 0x06 card failure
                     67: 0x0d uart receive overflow
                     68: 0x0e receive overflow
                     69: 0x0f missing external clock
                     70: 0x10 cts false too long
                     71: 0x11 lost carrier
                     72: 0x12 activity timeout
                     73: 0x13 connection not established
                     74: 0x19 illegal databits/parity
                     75: 0x1a register address out of range
                     76: 0x1b register value out of range
                     77: 0x-- unknown error
                     78: .DE
                     79: .SH BUGS
                     80: Breaks received at a faster rate then 1 break every second will be 
                     81: recognized as a single break.
                     82: 
                     83: Console use is not supported.
                     84: 
                     85: The RS-422/423/499, MTS-DSN/DL modes of the card are not supported.

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