Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site utcs.UUCP 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