Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!think!mintaka!bloom-beacon!eru!luth!sunic!mcsun!tuvie!edvvie!eliza!johnny
From: johnny@edvvie.at (Johann Schweigl)
Newsgroups: comp.unix.aix
Subject: Re: TTY line problem
Message-ID: <210@eliza.edvvie.at>
Date: 3 Jan 90 22:37:21 GMT
References: <3694@nmtsun.nmt.edu>
Organization: Edv GesmbH, Austria/Europa
Lines: 17

From article <3694@nmtsun.nmt.edu>, by peter@hydrovax.nmt.edu (Peter A. Blemel):
> In article <48200002@uicsrd.csrd.uiuc.edu>, guarna@uicsrd.csrd.uiuc.edu writes...
>>... Everything
>>seems to work fine until I turn the terminal off.  When I turn it on later
>>to try and use the terminal again, the line won't communicate. 

We had similar problems with a model 125 and 135. In our case, excessive noise
was the cause. When a 3151 was switched off, the respective 3-wire RS232 
line was a kind of antenna. Seems the terminal leaves the line ends open when 
not turned on. First action was to use shielded wire and connect everything
to ground that *SHOULD* be grounded. That reduced the problems reasonably.
Second, we switched to RS422. Since then, we have no trouble of this kind.
-- 
This does not reflect the   | Johann  Schweigl | DOS?
opinions of my employer.    | johnny@edvvie.at | Kind of complicated
I am busy enough by talking |                  | bootstrap loader ...
about my own ...            |   EDVG  Vienna   |