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Conference csc32::consolemanager

Title:POLYCENTER Console Manager
Notice:Kits, Scans, Docs on CSC32:: as PCM$KITS:,PCM$DOCS:, PCM$SCANS:
Moderator:CSC32::BUTTERWORTH
Created:Thu Aug 06 1992
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1541
Total number of notes:6564

983.0. "Unconvenient Halt cpu with <NULL> char" by 48579::MALRAS (Knowledge is power, en France aussi) Fri Sep 15 1995 09:59

A VAX4500 has halted while receiving a <NULL> character. This one was sent by a
3COM server during a switch off sequence.

This VAX is set up with CONTROLP = disabled.

My question : Is a <NULL> char interpreted as a BREAK ?
              What is really a BREAK sequence ? Is it simply an ascii char, or 
	      is it a protocol ? 

Thanks for your help.
Jean-Francois
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983.1ZENDIA::DBIGELOWInnovate, Integrate, EvaporateFri Sep 15 1995 10:401
    If I remember correctly, it is a very long sequence of NULL's.
983.248579::MALRASKnowledge is power, en France aussiFri Sep 15 1995 11:133
May be. Not sure because i've not seen myself.

JF
983.3CSC32::BUTTERWORTHGun Control is a steady hand.Fri Sep 15 1995 12:228
    A BREAK is a long spacing condition and not really a character. It's
    also a character framing error when you get right down to it. This same
    problem can occur when you bounce most digital terminal servers. To
    prevent the problem set the system forn ctrl_p enable and now a
    control-p will halt the system but a BREAK will not.
    
    Regs,
      Dan
983.4^ P instead of BREAK ?48579::MALRASKnowledge is power, en France aussiTue Sep 26 1995 05:229
Dan,

I agree to apply your recommandation, when it is possible.

But what is the workaround with a system which does not understand ^P, like a
VAX 3000-90 for example ?

Regards.
JF
983.5ZENDIA::DBIGELOWInnovate, Integrate, EvaporateTue Sep 26 1995 10:165
    Then you want to send a real break signal. You could use Control-P to
    send the break or any other control chatacter you see fit. How about
    control-b?
    
    Dave