1.\" Copyright (c) 1980, 1991 Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" %sccs.include.redist.man% 5.\" 6.\" @(#)dn.4 6.2 (Berkeley) 03/27/91 7.\" 8.Dd 9.Dt DN 4 vax 10.Os BSD 4 11.Sh NAME 12.Nm dn 13.Nd 14.Tn DN-11 15autocall unit interface 16.Sh SYNOPSIS 17.Cd "device dn0 at uba? csr 0160020 vector dnintr" 18.Sh DESCRIPTION 19The 20.Nm dn 21device provides an interface through a 22.Tn DEC 23.Tn DN-11 24(or equivalent 25such as the Able Quadracall) to an auto-call unit 26.Pq Tn ACU . 27To place an outgoing call one forks a sub-process which 28opens the appropriate call unit file, 29.Pa /dev/cua? 30and writes the phone number on it. The parent process 31then opens the corresponding modem line 32.Pa /dev/cul? . 33When the connection has been 34established, the open on the modem line 35.Pa /dev/cul? 36will return and the process will be connected. 37A timer is normally used to timeout the opening of 38the modem line. 39.Pp 40The codes for the phone numbers are: 41.Bl -column xxxx -offset indent 420-9 number to be dialed 43* dial * (`:' is a synonym) 44# dial # (`;' is a synonym) 45\- delay 20 milliseconds 46< end of phone number (`e' is a synonym) 47= delay for a second dial tone (`w' is a synonym) 48f force a hangup of any existing connection 49.El 50.Pp 51The phone number to be dialed must be presented as one contiguous string. 52.Pp 53By convention, even numbered call units are for 300 baud 54modem lines, while odd numbered units are for 1200 baud lines. 55For example, 56.Pa /dev/cua0 57is associated with a 300 baud modem line, 58.Pa /dev/cul0 , 59while 60.Pa /dev/cua1 61is associated with a 1200 baud modem line, 62.Pa /dev/cul1 . 63For devices such as the Quadracall which simulate multiple 64.Tn DN-11 65units, the minor device indicates which outgoing modem to use. 66.Sh FILES 67.Bl -tag -width /dev/cul? -compact 68.It Pa /dev/cua? 69call units 70.It Pa /dev/cul? 71associated modem lines 72.El 73.Sh DIAGNOSTICS 74Two error numbers are of interest at open time. 75.Bl -tag -width EBUSYxx 76.It Bq Er EBUSY 77The dialer is in use. 78.It Bq Er ENXIO 79The device doesn't exist, or there's no power to it. 80.El 81.Sh SEE ALSO 82.Xr tip 1 83.Sh HISTORY 84A 85.Nm 86driver appeared in 87.At v6 . 88