Re: RS232 Voltage Levels

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They always worked well for me - and everyone else in the industry for
about 20 years...


Bob


Re: RS232 Voltage Levels

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The RS-232 specification was originally designed as an interface for
electro-mechanical printers, using discrete transistor logic to convert
signals coming over telephone pair hooked up to  the old relay-switched
public telephone system into successive ASCII characters printed on a
rol of paper.

Search on "Telex" and "TWX". It up-graded the original 50/75
character-per-second telex system whose only active components were
electro-mechanical - essentially relay logic.

You should be able to find a history of the ASR-33 terminal somewhere
on the web - that was the cheap version of the ASR-35 bought by people
who had to handle significant amounts of TWX traffic.

--
Bill Sloman, Nijmegen


Re: RS232 Voltage Levels

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Nope. The ASR-33 was 20 mA current loop - not RS232.


Bob


Re: RS232 Voltage Levels

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What is "Fuchs"?  Shorthand for fuck-head?  I plonked him weeks ago.
I recommend everyone else do the same.

                                        ...Jim Thompson
--
|  James E.Thompson, P.E.                           |    mens     |
|  Analog Innovations, Inc.                         |     et      |
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Re: RS232 Voltage Levels

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German word for "FOX"

--
Uwe Bonnes                 snipped-for-privacy@elektron.ikp.physik.tu-darmstadt.de

Institut fuer Kernphysik  Schlossgartenstrasse 9  64289 Darmstadt
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