Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!utgpu!water!watnot!watmath!clyde!rutgers!ames!ucbcad!ucbvax!SLACSLD.BITNET!SAXTON
From: SAXTON@SLACSLD.BITNET.UUCP
Newsgroups: comp.os.vms
Subject: Re: Break character on VAX/VMS
Message-ID: <8704150135.AA21247@ucbvax.Berkeley.EDU>
Date: Tue, 14-Apr-87 12:22:00 EST
Article-I.D.: ucbvax.8704150135.AA21247
Posted: Tue Apr 14 12:22:00 1987
Date-Received: Thu, 16-Apr-87 01:14:34 EST
Sender: daemon@ucbvax.BERKELEY.EDU
Distribution: world
Organization: The ARPA Internet
Lines: 18


> Has anyone ever written (or knows) a program to generate a BREAK
> character and send it down a VAX terminal line in order to get the
> attention of another computer (connected to that terminal line)
> which "wakes up" only on  BREAK characters ?

I did once write a program to send a break signal on a specified DZ11
terminal line, but with VMS version 4, such a program is redundant.
There is now a "parity flag" value of TT$M_BREAK that can be specified
with the $QIO IO$_SETMODE function to turn on the break state.  A
second $QIO (sent after the appropriate time, usually 0.2 sec) with the
TT$M_BREAK bit turned off is needed to turn the break state off again.
This is documented in section 8.4.3 of the (version 4.4) I/O User's
Reference Manual: Part I.

Owen Saxton
Bitnet: SAXTON@SLACSLD
Hepnet: SLD::SAXTON