DCL

Section: Devices and Network Interfaces (4)
Updated: hp300
Index Return to Main Contents

BSD mandoc
 

NAME

dcl - HP 98628A communications link  

SYNOPSIS

device dcl0 at scode? flags 0x1  

DESCRIPTION

The 98628A is a buffered EIA RS-232C ( CCITT V.28 communications interface. It has one port with full modem control.

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.

An optional argument 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.

Use HP cable "98626 & 98628 opts.002, RS232-C DCE CABLE 5061-4216" to attach non-modem devices. Use HP cable "98626 & 98628 opts.001, RS232-C DTE CABLE 5061-4215" to attach modems.

The 98628A has a 256 byte input silo and a 256 output silo. Input interrupts happen on a per character basis.

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.

For output to devices that make heavy use of XON/XOFF a write size of less then 256 will improve performance marginally.  

FILES

/dev/ttyl[0-9]

 

DIAGNOSTICS

dcl%d: error 0x%x RESET CARD.
Where the errors are encoded:
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

 

SEE ALSO

tty(4)  

HISTORY

The driver Ud  

BUGS

Breaks received at a faster rate then 1 break every second will be recognized as a single break.

Console use is not supported.

The RS-422/423/499 MTS-DSN/DL modes of the card are not supported.


 

Index

NAME
SYNOPSIS
DESCRIPTION
FILES
DIAGNOSTICS
SEE ALSO
HISTORY
BUGS

This document was created by man2html, using the manual pages.
Time: 06:48:18 GMT, May 19, 2025