[rescue] Re: Trying to get Cadmus 9200 running (serial console trouble)

[Mike Spooner]

Long shot: if the system originated in Germany, it might well prefer
RS423 - quite a few 80s/90s normally-RS232 UNIX systems were
jumpered/configured for RS423 for that particular regional market.

-- Mike Spooner

--------- Original Message ---------
From: Meelis Roos
To: rescue at sunhelp.org
Date: Wed Feb 06 08:16:19 GMT+00:00 2019
Subject: Re: [rescue] Trying to get Cadmus 9200 running (serial console
trouble)
>> I retried it. it's less consistent than I remembered.
>>
>>
Aaa at a@aa at aa@aaaaaaAaA at AAaAa@aAcssssbscsbbsbbsbssbd``DD at d@`@d`d at d@ddD at D@`@`dDDDddfDfDDfDdDfffDf
>>
>>
``qqqqqqqqqaaq`qqqqa`a`aqqqqq`qaq`qvwwwwwvwwwwwgwvwwwvwwwwwADeDe at eAe@eDDaDdaeEeaeaDae`eDED
>
> Hmmm. Is it possible that it's a differential serial line, like RS423
> or similar? If that's the case, if the other line of the differential
> pair isn't grounded, I've seen exactly this sort of behavior.

Docs say it's standard RS-232. There is an option card for 20mA current
loop that has + and -
for both Rx ja Rx but that is clearly with a separate conversion adapter
only.

Perhaps I just got some not connected pin to PC side Rx and the cable
picked up some noise?
But that seems unlikely as RS-232 should not pick up anything below +-3V
and "antenna" should
not induce volatages over 3V here, I think.

--
Meelis Roos <mroos at linux.ee>
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