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From: narem-james@yale.UUCP
Newsgroups: comp.unix.wizards
Subject: variable length break on a 3b2/300
Message-ID: <10165@yale-celray.yale.UUCP>
Date: Mon, 20-Apr-87 23:05:14 EST
Article-I.D.: yale-cel.10165
Posted: Mon Apr 20 23:05:14 1987
Date-Received: Wed, 22-Apr-87 02:41:51 EST
Sender: daemon@yale.UUCP
Organization: Yale University, New Haven, CT
Lines: 17

From: "James E. Narem Jr." <narem-james>

  Help!?  I have a ATT 3B2/300 running Unix Sys V.2 with /dev/contty
connected up to a Gandalf PACX - conceptually a giant rotary switch
controled by a computer which connects various RS232 gadgets together.
You send a BREAK at it for a few seconds, hit return and it prompts
you with "enter class" and you give it a machine name.

  The problem is that the ioctl TCSBRK (termio(7)) sends a break for
0.25 seconds.  I tried putting it in a tight loop, but that doesn't
cut it, the PACX wants the line at 0 for at least 2 seconds.  I tried
toggling DTR, but that doesn't seem to be connected to the PACX.

  So the big ? is:  Does anyone have a hack to send a variable length
break on a 3b2?  Thanks for any help.

        ..........jim (Narem@Yale.ARPA, cmcl2!yale!narem, Narem@YaleCS.BITNET)