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Path: utzoo!utcs!tj
From: tj@utcs.UUCP (tj)
Newsgroups: net.micro
Subject: Re: servo computer products
Message-ID: <754@utcs.UUCP>
Date: Wed, 17-Jul-85 09:30:13 EDT
Article-I.D.: utcs.754
Posted: Wed Jul 17 09:30:13 1985
Date-Received: Wed, 17-Jul-85 10:23:32 EDT
References: <732@abnji.UUCP> <7000006@uicsl>
Reply-To: tj@utcs.UUCP (tj)
Organization: University of Toronto - General Purpose UNIX
Lines: 11
Summary: 


May a thousand engineers congregate at my door if I am wrong.

To the best of my knowledge what you probably have is an EIA interface.
EIA is the same as 232 except it is TTL levels (gross simplification).
It is possible to get true rs232 from 5 volt supply by adding a small
supply inverter module on the board. It takes +5 volts and gives you
-12 volts using a small transformer and a switching type arrangement.
A lot of equipment doesn't really give a true -12 for rs232, but a lot
of equipment also doesn't require -12 on input!
t.jones