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From: henry@utzoo.UUCP (Henry Spencer)
Newsgroups: net.analog
Subject: Re: Re: Any 555 mavens or PUT weenies out there?
Message-ID: <5507@utzoo.UUCP>
Date: Fri, 19-Apr-85 12:24:35 EST
Article-I.D.: utzoo.5507
Posted: Fri Apr 19 12:24:35 1985
Date-Received: Fri, 19-Apr-85 12:24:35 EST
References: <469@umd5.UUCP> <396@psivax.UUCP>, <557@intelca.UUCP>
Organization: U of Toronto Zoology
Lines: 12

As somebody has pointed out, you can't reliably run a 1488 on +-5.
This is a major reason for spending some time and effort on getting a
higher voltage, rather than trying to run RS232 on +-5 (even though
it's within the RS232 spec).  The combination of a 1488 and a 1489 is
amazingly tolerant of all kinds of out-of-RS232-spec conditions; those
chips are the major reason why you can get away with running RS232 cables
much farther than the spec says.  It is probably better to use these
decidedly-superior off-the-shelf drivers and receivers, even though it
does mean some hassle to get the 1488 the $#%$#@ supply voltages it needs.
-- 
				Henry Spencer @ U of Toronto Zoology
				{allegra,ihnp4,linus,decvax}!utzoo!henry