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From: owens@acsu.buffalo.edu (bill owens)
Newsgroups: sci.electronics
Subject: Re: Help Needed: TTL<->RS232 without -12vdc
Keywords: RS232, TTL, level shifting
Message-ID: <33810@eerie.acsu.Buffalo.EDU>
Date: 27 Aug 90 13:37:36 GMT
References: <7574@scolex.sco.COM> <1990Aug25.232127.4269@hayes.fai.alaska.edu> <1990Aug26.234711.23808@cbnewsc.att.com>
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In article <1990Aug26.234711.23808@cbnewsc.att.com> psfales@cbnewsc.att.com (Peter Fales) writes:
>In article <7574@scolex.sco.COM>, deanr@sco.COM (Dean Reece) writes...
>> 
>>Hi, I need some help with RS232 drivers/receivers
>
>This may or may not be what you are looking for, but if you just want to
>talk to a single specific RS-232 device, I have had good luck using a
>TTL inverter as an RS-232 driver.
>
>I don't recommend this technnique for a commercial product (or anything
>that someone besides yourself might use)

I'm presently working on s/w for a device that uses inverters as RS-232
drivers. The technique has the additional advantage that you can output a
1 to the latch, and the inverter flips it to the 'correct' level of 0 volts.
I didn't design the thing, but it has been a successful commercial device
for 7 years...

Bill.

Bill Owens                                              owens@acsu.buffalo.edu
108 Computing Center                              uunet!acsu.buffalo.edu!owens
Buffalo, NY 12460                                                 716/636-3511