TTY line problem

[Johann Schweigl]

>From article <3694 at nmtsun.nmt.edu>, by peter at hydrovax.nmt.edu (Peter A. Blemel):
> In article <48200002 at uicsrd.csrd.uiuc.edu>, guarna at 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.
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